Aspects of condition in captive and free-ranging dolphins
- Authors: Young, Deborah Dione
- Date: 1999
- Subjects: Dolphins -- Physiology Dolphins -- Behavior
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5799 , http://hdl.handle.net/10962/d1006117
- Description: Aspects of morphological and physiological condition of captive and net-caught dolphins were studied with respect to age, diet, reproduction and seasonal changes in environmental factors. These investigations aimed to provide base-line data on marine mammal physiological and morphological condition indices and to expand the knowledge of condition assessment of small cetaceans. By examining the interactive nature of animal condition and growth, diet and the environment, the study investigated the potential usefulness of animal condition indices to assess and monitor habitat quality. Base-line values for haematological and blood chemistry parameters were established for five captive bottlenose dolphins (Tursiops truncatus), using monthly blood samples, collected between 1992 and 1995, and corresponding measures of body weight and blubber thickness; feeding, dietary energy intake, water temperature and behavioural and medical records. Curves of best fit were used to interpret trends between leukocytic, haematological and blood chemistry parameters and morphology, diet and water temperature. WBC's and WBC differential cell types were related more distinctly to clinical changes in health, than to condition. RBC, HB and PCV were useful as short-term indicators of nutritional condition, with enhanced haematological status associated with greater food intake and improved diet quality. Weight was a more effective long-term indicator of nutritional status. The importance of blubber thickness measurements as a morphological index of condition was reinforced, with relationships between blubber thickness and haematology highlighting interactions between morphological and physiological condition. The complex interactions between haematology, diet, temperature and weight emphasised the need to account for all influential factors when considering haematological condition. The blood chemistry parameters of serum creatinine, BUN, BUN:creatinine and serum albumin provided the best indication of nutritional condition and diet quality in captive dolphins. Creatinine and BUN:creatinine also reflected changes in morphological condition. Reduced ALP was associated with nutritional stress but was more effectively used as an indication of metabolism and growth activity. LDH and CPK were highly variable and fluctuated with changing activity levels, limiting their use as condition indices. Serum sodium was an important indication of diet quality and hydration status. Many of these parameters effectively illustrated that physiological condition is compromised outside of the thermoneutral zone of the species. Bottlenose and common (Delphinus delphis) dolphins, incidentally caught in shark nets, were used to investigate the condition of free-ranging dolphins. Blood samples, taken as soon as possible after capture from drowned animals, were used to analyse physiological parameters. Dissections provided morphological data. Age and dietary status were assessed using growth layer groups in teeth and stomach content analyses, respectively. Morphological measures of net-caught dolphins reflected important interactions with diet, water temperature and reproductive status. Weight, girth and blubber thickness were valuable indicators of condition, although blubber thickness and proportional blubber weight were the best indicators of nutritional status. Condition of net-caught dolphins was difficult to assess in terms of leukocytic and haematological parameters. Stress- and post-mortem-associated changes, and variable data, reduced the usefulness of some parameters. WBC counts reflected on immunological status and served to emphasise changes in health, which may lead to deterioration in condition. WBC's showed potential as indicators of habitat quality, in terms of parasite load and/or pollution. Interactions between RBC, HB, PCV, MCV and dietary, morphological and environmental factors proved valuable in the short-term. Several haematological parameters were related to morphological condition, with weight, girth and blubber thickness, showing potential as non-invasive predictors of haematological status. Relationships between haematology and water temperature implied that dolphins have physiological and environmental "zones of comfort", within which condition is optimised. LDH and CPK were elevated by capture stress and post-mortem changes. Serum sodium and plasma glucose were good indicators of short-term nutritional status, but were altered by stress, which reduced their usefulness as condition indicators. BUN, albumin, globulin, albumin:globulin, total cholesterol and triglycerides appeared to be little affected by these changes and are potentially valuable indicators of condition in net-caught and/or free-ranging dolphins, particularly with respect to nutritional condition, and associated changes in morphology. Although data were limited, these parameters show the greatest potential as physiological indicators of animal condition and environmental health. The limitations of this study are recognised, however, results highlight the feasibility of using net-caught specimens to monitor the condition of free-ranging marine mammals, and the marine habitat as a whole. Relationships established in this study will be used to elucidate further on the interactive nature of marine mammal condition and aid in the development of a non-invasive condition assessment technique.
- Full Text:
- Date Issued: 1999
- Authors: Young, Deborah Dione
- Date: 1999
- Subjects: Dolphins -- Physiology Dolphins -- Behavior
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5799 , http://hdl.handle.net/10962/d1006117
- Description: Aspects of morphological and physiological condition of captive and net-caught dolphins were studied with respect to age, diet, reproduction and seasonal changes in environmental factors. These investigations aimed to provide base-line data on marine mammal physiological and morphological condition indices and to expand the knowledge of condition assessment of small cetaceans. By examining the interactive nature of animal condition and growth, diet and the environment, the study investigated the potential usefulness of animal condition indices to assess and monitor habitat quality. Base-line values for haematological and blood chemistry parameters were established for five captive bottlenose dolphins (Tursiops truncatus), using monthly blood samples, collected between 1992 and 1995, and corresponding measures of body weight and blubber thickness; feeding, dietary energy intake, water temperature and behavioural and medical records. Curves of best fit were used to interpret trends between leukocytic, haematological and blood chemistry parameters and morphology, diet and water temperature. WBC's and WBC differential cell types were related more distinctly to clinical changes in health, than to condition. RBC, HB and PCV were useful as short-term indicators of nutritional condition, with enhanced haematological status associated with greater food intake and improved diet quality. Weight was a more effective long-term indicator of nutritional status. The importance of blubber thickness measurements as a morphological index of condition was reinforced, with relationships between blubber thickness and haematology highlighting interactions between morphological and physiological condition. The complex interactions between haematology, diet, temperature and weight emphasised the need to account for all influential factors when considering haematological condition. The blood chemistry parameters of serum creatinine, BUN, BUN:creatinine and serum albumin provided the best indication of nutritional condition and diet quality in captive dolphins. Creatinine and BUN:creatinine also reflected changes in morphological condition. Reduced ALP was associated with nutritional stress but was more effectively used as an indication of metabolism and growth activity. LDH and CPK were highly variable and fluctuated with changing activity levels, limiting their use as condition indices. Serum sodium was an important indication of diet quality and hydration status. Many of these parameters effectively illustrated that physiological condition is compromised outside of the thermoneutral zone of the species. Bottlenose and common (Delphinus delphis) dolphins, incidentally caught in shark nets, were used to investigate the condition of free-ranging dolphins. Blood samples, taken as soon as possible after capture from drowned animals, were used to analyse physiological parameters. Dissections provided morphological data. Age and dietary status were assessed using growth layer groups in teeth and stomach content analyses, respectively. Morphological measures of net-caught dolphins reflected important interactions with diet, water temperature and reproductive status. Weight, girth and blubber thickness were valuable indicators of condition, although blubber thickness and proportional blubber weight were the best indicators of nutritional status. Condition of net-caught dolphins was difficult to assess in terms of leukocytic and haematological parameters. Stress- and post-mortem-associated changes, and variable data, reduced the usefulness of some parameters. WBC counts reflected on immunological status and served to emphasise changes in health, which may lead to deterioration in condition. WBC's showed potential as indicators of habitat quality, in terms of parasite load and/or pollution. Interactions between RBC, HB, PCV, MCV and dietary, morphological and environmental factors proved valuable in the short-term. Several haematological parameters were related to morphological condition, with weight, girth and blubber thickness, showing potential as non-invasive predictors of haematological status. Relationships between haematology and water temperature implied that dolphins have physiological and environmental "zones of comfort", within which condition is optimised. LDH and CPK were elevated by capture stress and post-mortem changes. Serum sodium and plasma glucose were good indicators of short-term nutritional status, but were altered by stress, which reduced their usefulness as condition indicators. BUN, albumin, globulin, albumin:globulin, total cholesterol and triglycerides appeared to be little affected by these changes and are potentially valuable indicators of condition in net-caught and/or free-ranging dolphins, particularly with respect to nutritional condition, and associated changes in morphology. Although data were limited, these parameters show the greatest potential as physiological indicators of animal condition and environmental health. The limitations of this study are recognised, however, results highlight the feasibility of using net-caught specimens to monitor the condition of free-ranging marine mammals, and the marine habitat as a whole. Relationships established in this study will be used to elucidate further on the interactive nature of marine mammal condition and aid in the development of a non-invasive condition assessment technique.
- Full Text:
- Date Issued: 1999
Guy Butler (obituary)
- Authors: Wright, Laurence
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:7052 , http://hdl.handle.net/10962/d1007411
- Description: An obituary focusing on Guy Butler's Shakespearean preoccupations. The 1999/2000 volume of Shakespeare in Southern Africa only appeared in 2001. The Butler obituary was included as a 'stop-press' item as the volume went to print, which accounts for the apparent anomaly between the date of publication and the date of Guy Butler's death.
- Full Text:
- Date Issued: 1999
- Authors: Wright, Laurence
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:7052 , http://hdl.handle.net/10962/d1007411
- Description: An obituary focusing on Guy Butler's Shakespearean preoccupations. The 1999/2000 volume of Shakespeare in Southern Africa only appeared in 2001. The Butler obituary was included as a 'stop-press' item as the volume went to print, which accounts for the apparent anomaly between the date of publication and the date of Guy Butler's death.
- Full Text:
- Date Issued: 1999
A contribution towards the taxonomy of the ichthyoplankton species community and an understanding of its dynamics along the south-east coast of South Africa
- Authors: Wood, A D (Aidan David)
- Date: 1999
- Subjects: Fishes -- Eggs Fishes -- Larvae Fishes -- Eggs -- Africa, Southern Fishes -- Larvae -- Africa, Southern
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5342 , http://hdl.handle.net/10962/d1006124
- Description: This study was prompted by the need to remedy the situation that existed with respect to the poor status of our knowledge regarding the ichthyoplankton assemblage of the nearshore region along the south-east Cape coast of South Africa. The first chapter provides a brief introduction to the field of ichthyoplankton research and includes a summary of the status of research in southern Africa and an explanation of early life history terminology. The selection of all sample sites, times and strategies is also outlined. The study area along the south-east Cape coast with respect to its location, climate and physical oceanography is described in the second chapter, as is the gear used, bongo nets and an RMT1x6. A sampling protocol for the use of bongos from a small ski-boat, and the RMT from the research vessels, and for the handling and processing of samples was established. The selection of Middlebank as the main monthly sampling site within the Tsitsikamma National Park (TNP) was based on taxonomic diversity as well as logistical and safety constraints. The effect of mesh size and time of sampling with bongo nets on the catchability of ichthyoplankton was investigated in chapter three. Most data was accumulated during Sea Fisheries research cruises, with additional collections coming from the National Parks vessel. Although the differences were not significant, the 505 μ mesh nets captured larger larvae, with catches comprising higher percentages of flexion and postflexion larvae. Larval concentration and size were consistently greater in samples from periods of reduced light intensity, but significant differences were the exception. It was decided that sampling with 505 μ mesh nets during daylight would provide a representative sample of the available ichthyoplankton assemblage, while at the same time being the most practical and least time consuming with respect to handling, clogging and backflushing. In chapter four, the early life history stages of thiny of the seventy-five taxa sampled are described, reflecting the paucity of information which existed on the ichthyoplankton of the nearshore zone in the south-east Cape. These descriptions are seen as an important contribution towards any future research efforts in the region, but as many of these descriptions are based on few or single specimens, it is realised that the description of egg and larval stages will be an ongoing process. Based upon the data collected during this study, an ichthyoplankton species checklist was established in chapter five. Seventy-five taxa of fish larvae were identified to either family, genus or species level. A number of squid para-larvae were also encountered. Similarities and discrepancies with a previous survey in the region are presented. The temporal distribution of eggs and larvae between August 1993 and October 1996 was established, and the spatial distribution of ichthyoplankton along an offshore transect was determined between January 1995 and May 1996. Only 7 species from Middlebank and twelve from all stations combined displayed seasonal trends, with most of these being prevalent during winter months. Egg production, both over Middlebank and from all stations combined, appeared to be consistent, with no seasonal trends. Based upon the results from the offshore transect samples, it would appear that a single ichthyoplankton assemblage exists from Storms River out to fifteen nautical miles. Although a variety of statistical methods were applied to the data during this study, low egg and larval concentrations and a low sampling frequency meant that results had to be interpreted carefully. Chapter six describes the preliminary investigation into the vertical distribution of eggs and larvae. During two research cruises, discrete depth sampling using an RMT1x6 net was performed, with the majority of samples being accompanied by physical data provided by a CTD rosette sampler. No definite patterns could be seen as larval concentrations were low, and the short time scale did not allow for the identification of any diel migratory patterns. The relationship between total larvae and the physical environment was poor. The only possible relationship was that between plankton volume and total egg and total larval concentrations. The TNP may play an important role in the conservation of reef fish and the seeding of nearby fishing grounds through the export of pelagic eggs and larvae. Chapter seven describes a preliminary investigation into the dispersal potential of ichthyoplankton from the TNP. Based upon longshore currents determined from drogues, ADCP vectors and current meter readings, it was clear that if larvae were passive drifters, the potential for their dispersal from the TNP did exist. This pilot study showed that future work should concentrate not only on the oceanographic aspects, but on behavioural aspects of larvae which may enhance or retard dispersal. In the final discussion, it is emphasised that while this study went a long way to increasing our knowledge of the nearshore ichthyoplankton community, the true picture of the temporal and spatial dynamics of the species assemblage may only be revealed once more intensive sampling has been performed. The resolution of the early life history stages of the sparids and the identification of eggs to species level are seen as priorities for the near future. A complete species checklist for the TNP is provided based upon previous surveys (both on adult and larval fishes), this work and personal observations. A total of 171 species of fish from 70 families were identified, illustrating that the eggs and larvae of many species in the TNP have yet to be sampled. A brief description of the collaborative effort which is envisaged for the TNP over the next few years is provided.
- Full Text:
- Date Issued: 1999
- Authors: Wood, A D (Aidan David)
- Date: 1999
- Subjects: Fishes -- Eggs Fishes -- Larvae Fishes -- Eggs -- Africa, Southern Fishes -- Larvae -- Africa, Southern
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5342 , http://hdl.handle.net/10962/d1006124
- Description: This study was prompted by the need to remedy the situation that existed with respect to the poor status of our knowledge regarding the ichthyoplankton assemblage of the nearshore region along the south-east Cape coast of South Africa. The first chapter provides a brief introduction to the field of ichthyoplankton research and includes a summary of the status of research in southern Africa and an explanation of early life history terminology. The selection of all sample sites, times and strategies is also outlined. The study area along the south-east Cape coast with respect to its location, climate and physical oceanography is described in the second chapter, as is the gear used, bongo nets and an RMT1x6. A sampling protocol for the use of bongos from a small ski-boat, and the RMT from the research vessels, and for the handling and processing of samples was established. The selection of Middlebank as the main monthly sampling site within the Tsitsikamma National Park (TNP) was based on taxonomic diversity as well as logistical and safety constraints. The effect of mesh size and time of sampling with bongo nets on the catchability of ichthyoplankton was investigated in chapter three. Most data was accumulated during Sea Fisheries research cruises, with additional collections coming from the National Parks vessel. Although the differences were not significant, the 505 μ mesh nets captured larger larvae, with catches comprising higher percentages of flexion and postflexion larvae. Larval concentration and size were consistently greater in samples from periods of reduced light intensity, but significant differences were the exception. It was decided that sampling with 505 μ mesh nets during daylight would provide a representative sample of the available ichthyoplankton assemblage, while at the same time being the most practical and least time consuming with respect to handling, clogging and backflushing. In chapter four, the early life history stages of thiny of the seventy-five taxa sampled are described, reflecting the paucity of information which existed on the ichthyoplankton of the nearshore zone in the south-east Cape. These descriptions are seen as an important contribution towards any future research efforts in the region, but as many of these descriptions are based on few or single specimens, it is realised that the description of egg and larval stages will be an ongoing process. Based upon the data collected during this study, an ichthyoplankton species checklist was established in chapter five. Seventy-five taxa of fish larvae were identified to either family, genus or species level. A number of squid para-larvae were also encountered. Similarities and discrepancies with a previous survey in the region are presented. The temporal distribution of eggs and larvae between August 1993 and October 1996 was established, and the spatial distribution of ichthyoplankton along an offshore transect was determined between January 1995 and May 1996. Only 7 species from Middlebank and twelve from all stations combined displayed seasonal trends, with most of these being prevalent during winter months. Egg production, both over Middlebank and from all stations combined, appeared to be consistent, with no seasonal trends. Based upon the results from the offshore transect samples, it would appear that a single ichthyoplankton assemblage exists from Storms River out to fifteen nautical miles. Although a variety of statistical methods were applied to the data during this study, low egg and larval concentrations and a low sampling frequency meant that results had to be interpreted carefully. Chapter six describes the preliminary investigation into the vertical distribution of eggs and larvae. During two research cruises, discrete depth sampling using an RMT1x6 net was performed, with the majority of samples being accompanied by physical data provided by a CTD rosette sampler. No definite patterns could be seen as larval concentrations were low, and the short time scale did not allow for the identification of any diel migratory patterns. The relationship between total larvae and the physical environment was poor. The only possible relationship was that between plankton volume and total egg and total larval concentrations. The TNP may play an important role in the conservation of reef fish and the seeding of nearby fishing grounds through the export of pelagic eggs and larvae. Chapter seven describes a preliminary investigation into the dispersal potential of ichthyoplankton from the TNP. Based upon longshore currents determined from drogues, ADCP vectors and current meter readings, it was clear that if larvae were passive drifters, the potential for their dispersal from the TNP did exist. This pilot study showed that future work should concentrate not only on the oceanographic aspects, but on behavioural aspects of larvae which may enhance or retard dispersal. In the final discussion, it is emphasised that while this study went a long way to increasing our knowledge of the nearshore ichthyoplankton community, the true picture of the temporal and spatial dynamics of the species assemblage may only be revealed once more intensive sampling has been performed. The resolution of the early life history stages of the sparids and the identification of eggs to species level are seen as priorities for the near future. A complete species checklist for the TNP is provided based upon previous surveys (both on adult and larval fishes), this work and personal observations. A total of 171 species of fish from 70 families were identified, illustrating that the eggs and larvae of many species in the TNP have yet to be sampled. A brief description of the collaborative effort which is envisaged for the TNP over the next few years is provided.
- Full Text:
- Date Issued: 1999
Graphicacy as a form of communication
- Authors: Wilmot, P Dianne
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6091 , http://hdl.handle.net/10962/d1008613
- Description: Children of today inhabit a multi-dimensional world and in order to communicate effectively in it they need the ability to utilise four forms of communication namely, oracy, literacy, numeracy and graphicacy. Communicating in graphic form requires an ability to both encode and decode spatial information using symbols which requires the utilisation and application of spatial perceptual skills and concepts. The draft Curriculum Framework for General and Further Education and Training identifies graphic literacy as one of the critical outcomes of the new South African curriculum. Spatial information about the environment is most frequently communicated in the graphic mode. Yet if graphicacy is to be recognised as an essential mode of communication and, as such, a vital element in education, then we need to seek ways of developing and introducing an explicit and critical pedagogy in our schools to foster the development of graphic and critical graphic literacy. But first, the skills and concepts integral to graphicacy need to be identified and understood. This article provides a framework for thinking about graphicacy as a form of communication in the General Education and Training (GET) band, the compulsory component of South African education (Grades 1-9).
- Full Text: false
- Date Issued: 1999
- Authors: Wilmot, P Dianne
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6091 , http://hdl.handle.net/10962/d1008613
- Description: Children of today inhabit a multi-dimensional world and in order to communicate effectively in it they need the ability to utilise four forms of communication namely, oracy, literacy, numeracy and graphicacy. Communicating in graphic form requires an ability to both encode and decode spatial information using symbols which requires the utilisation and application of spatial perceptual skills and concepts. The draft Curriculum Framework for General and Further Education and Training identifies graphic literacy as one of the critical outcomes of the new South African curriculum. Spatial information about the environment is most frequently communicated in the graphic mode. Yet if graphicacy is to be recognised as an essential mode of communication and, as such, a vital element in education, then we need to seek ways of developing and introducing an explicit and critical pedagogy in our schools to foster the development of graphic and critical graphic literacy. But first, the skills and concepts integral to graphicacy need to be identified and understood. This article provides a framework for thinking about graphicacy as a form of communication in the General Education and Training (GET) band, the compulsory component of South African education (Grades 1-9).
- Full Text: false
- Date Issued: 1999
Investigating systemic factors affecting science learning in Curriculum 2005 : case studies of two schools
- Authors: Wilkinson, Warren George
- Date: 1999
- Subjects: Curriculum change Curriculum change -- Case studies Science -- Study and teaching -- South Africa Curriculum planning -- South Africa Education -- South Africa -- Evaluation Competency-based education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1588 , http://hdl.handle.net/10962/d1003470
- Description: The thesis illustrates the contention that an outcomes-based system with its underlying philosophy of social constructivism cannot operate effectively within a traditional school system. Restructuring of an institution is necessary to accommodate the outcomes-based system. Using the research instruments of interviews, questionnaires, journals, participant observations and collection of physical artefacts, two case studies investigating systemic factors as they influence science learning were conducted in two South African schools. The one school, St Sebastian's College, was an extremely well resourced school while the other, Mtunzini High School was a middle class school in comparatively deprived circumstances. Attempts were made to introduce an outcomes-based education course involving a group of grade 8 learners in the respective schools. Difficulties in implementation were encountered and at best only very limited success was achieved. There were two reasons for this. First, particularly in the case of St Sebastian's College, I designed a course which was over ambitious in that it was not suited to the developmental stage of the learners. Second, traditional schooling systems follow a perspective of education termed 'the structure of the disciplines' which fosters a system of rigid time tabling, compartmentalisation of subjects and emphasis upon summative assessment. In contrast, the curricula I designed involved a 'cognitive' perspective which required flexible time scheduling, integration of subjects and developmental assessment. The conflicts which arose include time constraints and resistant attitudes on the part of learners and teachers. The thesis culminates with some suggested steps to follow should a school community wish to restructure. These include a shared vision, employing organised abandonment, capacity building and commitment to a systemic perspective.
- Full Text:
- Date Issued: 1999
- Authors: Wilkinson, Warren George
- Date: 1999
- Subjects: Curriculum change Curriculum change -- Case studies Science -- Study and teaching -- South Africa Curriculum planning -- South Africa Education -- South Africa -- Evaluation Competency-based education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1588 , http://hdl.handle.net/10962/d1003470
- Description: The thesis illustrates the contention that an outcomes-based system with its underlying philosophy of social constructivism cannot operate effectively within a traditional school system. Restructuring of an institution is necessary to accommodate the outcomes-based system. Using the research instruments of interviews, questionnaires, journals, participant observations and collection of physical artefacts, two case studies investigating systemic factors as they influence science learning were conducted in two South African schools. The one school, St Sebastian's College, was an extremely well resourced school while the other, Mtunzini High School was a middle class school in comparatively deprived circumstances. Attempts were made to introduce an outcomes-based education course involving a group of grade 8 learners in the respective schools. Difficulties in implementation were encountered and at best only very limited success was achieved. There were two reasons for this. First, particularly in the case of St Sebastian's College, I designed a course which was over ambitious in that it was not suited to the developmental stage of the learners. Second, traditional schooling systems follow a perspective of education termed 'the structure of the disciplines' which fosters a system of rigid time tabling, compartmentalisation of subjects and emphasis upon summative assessment. In contrast, the curricula I designed involved a 'cognitive' perspective which required flexible time scheduling, integration of subjects and developmental assessment. The conflicts which arose include time constraints and resistant attitudes on the part of learners and teachers. The thesis culminates with some suggested steps to follow should a school community wish to restructure. These include a shared vision, employing organised abandonment, capacity building and commitment to a systemic perspective.
- Full Text:
- Date Issued: 1999
The dynamics of a subtropical lake fishery in central Mozambique
- Authors: Weyl, Olaf L F
- Date: 1999
- Subjects: Fisheries -- Chicamba, Lake Fisheries -- Mozambique
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5212 , http://hdl.handle.net/10962/d1004785
- Description: Fisheries in African reservoirs are typically multi -species and in most cases the fish resource is harvested with a number of gears. These characteristics complicate their management and the development of management procedures. Typically, long time series of data on catch and effort and length- or age-based catch are not available for these fisheries. This precludes the use of data intensive methods such as multi-species virtual population analysis. The principal aim of this thesis was to develop a management procedure for African reservoir fisheries that takes into account the pertinent biological characteristics of the target species and accounts for the multi-species and multi-gear irIteractions in such fisheries. An opportunity availed itself to undertake this work on Lake ChicaIllba (19°08'S 33°08'E) a man-made hydroelectric dam in subtropical Mozambique (Manica province). The specific objectives of this study were: to obtain locality specific biological parameters for the target species in Lake ChicaIllba; to assess gear utilisation trends in the fishery through the determination of gear-selectivity, catch rate and effort for each of the principal gears used in the fishery; to assess the fishery using traditional per-recruit models and to test existing and new per-recruit models that account for the multi-species and multi-gear nature of the fishery and to determine the adequacy of each of these approaches in the determination of suitable target reference point (TRP) exploitation rates. The three principal specIes in Lake Chicamba are the introduced largemouth bass, Micropterus salmoides, and two cichlids the Mozambique tilapia, Oreochromis mossambicus and the redbreast tilapia, Tilapia rendalli. Sectioned otoliths were used for age and growth determination. Marginal zone analysis showed that annulus formation in all three species occurred during winter. The maximum-recorded age was 5 years for M. salmoides, 16 years for T. rendalli and 10 years for O. mossambicus. Growth of the three species was best described by the 3 parameter von Bertalanffy growth model as ℓa = 465.51 (1 - e⁻ₑ·ₑ⁷⁵⁽a⁺⁰·⁰⁰⁹⁾ mm FL for M salmoides; ℓa = 238.74 (1 - e⁻⁰⁶³⁶⁽a⁺⁰·⁹⁰⁵⁾) mm TL for T. rendalli; and ℓa = 266.06 (1 - e⁻⁰⁷⁹⁰⁴⁽a⁺⁰·²⁶⁹⁾) mm TL for 0. mossambicus. Female T. rendalli attained 50%-maturity at 2.89 years, while O. mossambicus matured at 2.83 years and M. salmoides at 0.9 years. Both cichlid species spawned throughout summer while M. salmoides had a very short spawning season from August to September. The total annual mortality rate (Z) for M. salmoides in Lake Chicamba was 1.27 yr⁻¹, the mean empirical estimate of natural mortality (M) was 0.73 yr⁻¹, and fishing mortality (F) was calculated at 0.54 yr⁻¹. For T. rendalli Z = 0.31 yr⁻¹, M = 0.20 yr⁻¹, F = 0.11 yr⁻¹ and for 0. mossambicus Z= 0.62 yr⁻¹, M= 0.38 yr⁻¹, F= 0.24 yr⁻¹. The three species exhibited reproductive traits, which implied a high reliance of recruitment on spawner stock (nest guarding in T. rendalli and M. salmoides and mouthbrooding in O. mossambicus). For this reason it was decided that the cichlid fisheries should be managed using TRPs which maintained the spawner biomass-per-recruit at 50% (FSB50) of pristine levels. However, based on good evidence it was hypothesised that the high rate of fishing mortality helped to maintain the fast growth rate of M. salmoides. It was, therefore, decided to manage this species at a TRP of F SB40. The three most important fishing sectors were the gill-net, seine-net and hook-and-line fisheries. The total catch for 1996 was 223 t. The gill nets selected all three species at a size/age approximating 50%-maturity while the seine-net and hook-and-line fisheries selected mainly juvenile fishes. There was strong evidence to suggest that seine net fishing also disrupted spawning. It was shown that the 'traditional' single-species per-recruit models were unsuitable to assess multi-species and multi-gear reservoir fisheries. Since existing multi-species/multifishery yield-per-recruit models were not capable of defining FsB(x) TRPs, a new multispecies/ multi-fishery spawner-biomass-per-recruit approach was developed. This approach allowed for the simulation of the response of spawner biomass-per-recruit to changes in effort in the three fishery sectors, simultaneously. The models showed that the spawner biomass-per-recruit, at current effort levels, was higher than the suggested TRP for the three species. However, it was shown that an increase of 10% in current total effort would reduce spawner biomass-per-recruit to below the recommended TRP levels. With the closure of the seine-net fishery, gill-net effort could be increased to 338 fishers (340 for management purposes) and effort in the hook-and-line fishery could be increased by 30% before the TRP was reached. To maintain the fish stocks above TRP levels, effort control was considered to be the most effective management method. The main recommendations for Lake Chicamba were to close the seine-net fishery, to limit the gill-net fishery to 340 fishers (using 137-m long x 3-m deep gill nets) and to maintain the open access nature of the hook-and-line fishery. The multi-species/multi-fishery per-recruit approach allows for the meaningful simulation of various scenarios and provides relatively robust management options. In the absence of long time series of effort and age- or length-based catch data, this approach was considered as the most suitable assessment method for multi-species/multi-gear African reservoir fisheries.
- Full Text:
- Date Issued: 1999
- Authors: Weyl, Olaf L F
- Date: 1999
- Subjects: Fisheries -- Chicamba, Lake Fisheries -- Mozambique
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5212 , http://hdl.handle.net/10962/d1004785
- Description: Fisheries in African reservoirs are typically multi -species and in most cases the fish resource is harvested with a number of gears. These characteristics complicate their management and the development of management procedures. Typically, long time series of data on catch and effort and length- or age-based catch are not available for these fisheries. This precludes the use of data intensive methods such as multi-species virtual population analysis. The principal aim of this thesis was to develop a management procedure for African reservoir fisheries that takes into account the pertinent biological characteristics of the target species and accounts for the multi-species and multi-gear irIteractions in such fisheries. An opportunity availed itself to undertake this work on Lake ChicaIllba (19°08'S 33°08'E) a man-made hydroelectric dam in subtropical Mozambique (Manica province). The specific objectives of this study were: to obtain locality specific biological parameters for the target species in Lake ChicaIllba; to assess gear utilisation trends in the fishery through the determination of gear-selectivity, catch rate and effort for each of the principal gears used in the fishery; to assess the fishery using traditional per-recruit models and to test existing and new per-recruit models that account for the multi-species and multi-gear nature of the fishery and to determine the adequacy of each of these approaches in the determination of suitable target reference point (TRP) exploitation rates. The three principal specIes in Lake Chicamba are the introduced largemouth bass, Micropterus salmoides, and two cichlids the Mozambique tilapia, Oreochromis mossambicus and the redbreast tilapia, Tilapia rendalli. Sectioned otoliths were used for age and growth determination. Marginal zone analysis showed that annulus formation in all three species occurred during winter. The maximum-recorded age was 5 years for M. salmoides, 16 years for T. rendalli and 10 years for O. mossambicus. Growth of the three species was best described by the 3 parameter von Bertalanffy growth model as ℓa = 465.51 (1 - e⁻ₑ·ₑ⁷⁵⁽a⁺⁰·⁰⁰⁹⁾ mm FL for M salmoides; ℓa = 238.74 (1 - e⁻⁰⁶³⁶⁽a⁺⁰·⁹⁰⁵⁾) mm TL for T. rendalli; and ℓa = 266.06 (1 - e⁻⁰⁷⁹⁰⁴⁽a⁺⁰·²⁶⁹⁾) mm TL for 0. mossambicus. Female T. rendalli attained 50%-maturity at 2.89 years, while O. mossambicus matured at 2.83 years and M. salmoides at 0.9 years. Both cichlid species spawned throughout summer while M. salmoides had a very short spawning season from August to September. The total annual mortality rate (Z) for M. salmoides in Lake Chicamba was 1.27 yr⁻¹, the mean empirical estimate of natural mortality (M) was 0.73 yr⁻¹, and fishing mortality (F) was calculated at 0.54 yr⁻¹. For T. rendalli Z = 0.31 yr⁻¹, M = 0.20 yr⁻¹, F = 0.11 yr⁻¹ and for 0. mossambicus Z= 0.62 yr⁻¹, M= 0.38 yr⁻¹, F= 0.24 yr⁻¹. The three species exhibited reproductive traits, which implied a high reliance of recruitment on spawner stock (nest guarding in T. rendalli and M. salmoides and mouthbrooding in O. mossambicus). For this reason it was decided that the cichlid fisheries should be managed using TRPs which maintained the spawner biomass-per-recruit at 50% (FSB50) of pristine levels. However, based on good evidence it was hypothesised that the high rate of fishing mortality helped to maintain the fast growth rate of M. salmoides. It was, therefore, decided to manage this species at a TRP of F SB40. The three most important fishing sectors were the gill-net, seine-net and hook-and-line fisheries. The total catch for 1996 was 223 t. The gill nets selected all three species at a size/age approximating 50%-maturity while the seine-net and hook-and-line fisheries selected mainly juvenile fishes. There was strong evidence to suggest that seine net fishing also disrupted spawning. It was shown that the 'traditional' single-species per-recruit models were unsuitable to assess multi-species and multi-gear reservoir fisheries. Since existing multi-species/multifishery yield-per-recruit models were not capable of defining FsB(x) TRPs, a new multispecies/ multi-fishery spawner-biomass-per-recruit approach was developed. This approach allowed for the simulation of the response of spawner biomass-per-recruit to changes in effort in the three fishery sectors, simultaneously. The models showed that the spawner biomass-per-recruit, at current effort levels, was higher than the suggested TRP for the three species. However, it was shown that an increase of 10% in current total effort would reduce spawner biomass-per-recruit to below the recommended TRP levels. With the closure of the seine-net fishery, gill-net effort could be increased to 338 fishers (340 for management purposes) and effort in the hook-and-line fishery could be increased by 30% before the TRP was reached. To maintain the fish stocks above TRP levels, effort control was considered to be the most effective management method. The main recommendations for Lake Chicamba were to close the seine-net fishery, to limit the gill-net fishery to 340 fishers (using 137-m long x 3-m deep gill nets) and to maintain the open access nature of the hook-and-line fishery. The multi-species/multi-fishery per-recruit approach allows for the meaningful simulation of various scenarios and provides relatively robust management options. In the absence of long time series of effort and age- or length-based catch data, this approach was considered as the most suitable assessment method for multi-species/multi-gear African reservoir fisheries.
- Full Text:
- Date Issued: 1999
On the life history of a cyprinid fish, Labeo cylindricus
- Weyl, Olaf L F, Booth, Anthony J
- Authors: Weyl, Olaf L F , Booth, Anthony J
- Date: 1999
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125408 , vital:35780 , https://doi.10.1023/A:1007543319416
- Description: Fishes of the genus Labeo are widely distributed throughout Africa and consist of at least 80 species which comprise 16.4% of the African cyprinid ichthyofauna (Reid 1985). Most labeo species are also commercially important throughout the African continent, having contributed significantly to various fisheries. Their roe (sensu caviar) is often harvested as an additional bycatch (Skelton et al. 1991). Despite their obvious importance, the few studies that have investigated aspects of their life history have been conducted on the larger commercial species (Lowe 1952, Mulder 1973, Balon et al. 1974, Potgieter 1974, Baird 1976, Tomasson et al. 1984, van Zyl et al. 1995).
- Full Text:
- Date Issued: 1999
- Authors: Weyl, Olaf L F , Booth, Anthony J
- Date: 1999
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125408 , vital:35780 , https://doi.10.1023/A:1007543319416
- Description: Fishes of the genus Labeo are widely distributed throughout Africa and consist of at least 80 species which comprise 16.4% of the African cyprinid ichthyofauna (Reid 1985). Most labeo species are also commercially important throughout the African continent, having contributed significantly to various fisheries. Their roe (sensu caviar) is often harvested as an additional bycatch (Skelton et al. 1991). Despite their obvious importance, the few studies that have investigated aspects of their life history have been conducted on the larger commercial species (Lowe 1952, Mulder 1973, Balon et al. 1974, Potgieter 1974, Baird 1976, Tomasson et al. 1984, van Zyl et al. 1995).
- Full Text:
- Date Issued: 1999
The process of learning and teaching in supplemental instruction groups at Rhodes University
- Authors: Vorster, Jo-Anne Elizabeth
- Date: 1999
- Subjects: Group work in education , Team learning approach in education , College teaching -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3081 , http://hdl.handle.net/10962/d1002590 , Group work in education , Team learning approach in education , College teaching -- South Africa
- Description: This thesis investigates the process of peer collaborative learning in three Supplemental Instruction (SI) groups at Rhodes University. The roles of the SI leader, the students and the task in the peer-collaborative learning-teaching process were researched. The research is rooted in sociocultural theories of learning and development. The notion of activity is thus central to this investigation. The tasks, goals and interactions in the SI sessions were analysed in order to arrive at an understanding of the process of learning-teaching in each of the three SI sessions. A method of analysis devised by Van Vlaenderen to study the process of everyday cognition in the problem solving activities of community activists (1997) was adapted for this study. The method of analysis was used to study the interaction processes of participants in the SI groups. Each interaction between the SI participants was broken into its constituent parts and labeled in terms of the goals of the interactions in relation to the preceding interaction or operation, the task or subtask under discussion, and the SI session as a whole. Data from the analysis of the activity were quantified in order to assess the quality of the learning-teaching process. A qualitative analysis of the patterns of mediation was used in conjunction with the quantified data of interaction patterns to draw conclusions about the nature of the peer collaborative learning-teaching process in the three SI sessions. The research findings indicate that the nature of the SI task is crucial; students in SI need to be able and willing to participate; and the facilitation style of the SI leader plays a role in determining the quality of the activity in the SI session. The thesis explicates learning-teaching activity that results in higher order learning.
- Full Text:
- Date Issued: 1999
- Authors: Vorster, Jo-Anne Elizabeth
- Date: 1999
- Subjects: Group work in education , Team learning approach in education , College teaching -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3081 , http://hdl.handle.net/10962/d1002590 , Group work in education , Team learning approach in education , College teaching -- South Africa
- Description: This thesis investigates the process of peer collaborative learning in three Supplemental Instruction (SI) groups at Rhodes University. The roles of the SI leader, the students and the task in the peer-collaborative learning-teaching process were researched. The research is rooted in sociocultural theories of learning and development. The notion of activity is thus central to this investigation. The tasks, goals and interactions in the SI sessions were analysed in order to arrive at an understanding of the process of learning-teaching in each of the three SI sessions. A method of analysis devised by Van Vlaenderen to study the process of everyday cognition in the problem solving activities of community activists (1997) was adapted for this study. The method of analysis was used to study the interaction processes of participants in the SI groups. Each interaction between the SI participants was broken into its constituent parts and labeled in terms of the goals of the interactions in relation to the preceding interaction or operation, the task or subtask under discussion, and the SI session as a whole. Data from the analysis of the activity were quantified in order to assess the quality of the learning-teaching process. A qualitative analysis of the patterns of mediation was used in conjunction with the quantified data of interaction patterns to draw conclusions about the nature of the peer collaborative learning-teaching process in the three SI sessions. The research findings indicate that the nature of the SI task is crucial; students in SI need to be able and willing to participate; and the facilitation style of the SI leader plays a role in determining the quality of the activity in the SI session. The thesis explicates learning-teaching activity that results in higher order learning.
- Full Text:
- Date Issued: 1999
The power behind the scenes: the Afrikaner Nationalist Women's Parties, 1915 to 1931.
- Authors: Vincent, Louise
- Date: 1999
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141795 , vital:38005 , DOI: 10.1080/02582479908671348
- Description: The Enlightenment expectation was that political identity based on ethnic nationalist sentiments would gradually give way to more ‘rational’ forms of association. That expectation has, in the late twentieth century, proved somewhat premature. The explosion of ethnic nationalist conflicts onto the international stage in the post-Cold War era has brought with it a renewed intellectual interest in the politics of nationalism and ethnicity. In response to the need for new avenues of inquiry amidst a vast and growing literature, Anthony Smith’s work on national identity appeals for a research agenda which treats nations and nationalism as cultural phenomena as well as forms of politics.
- Full Text:
- Date Issued: 1999
- Authors: Vincent, Louise
- Date: 1999
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141795 , vital:38005 , DOI: 10.1080/02582479908671348
- Description: The Enlightenment expectation was that political identity based on ethnic nationalist sentiments would gradually give way to more ‘rational’ forms of association. That expectation has, in the late twentieth century, proved somewhat premature. The explosion of ethnic nationalist conflicts onto the international stage in the post-Cold War era has brought with it a renewed intellectual interest in the politics of nationalism and ethnicity. In response to the need for new avenues of inquiry amidst a vast and growing literature, Anthony Smith’s work on national identity appeals for a research agenda which treats nations and nationalism as cultural phenomena as well as forms of politics.
- Full Text:
- Date Issued: 1999
Reproductive behaviour of Plectroctena mandibularis F. Smith (Hymenoptera: Formicidae), a ponerine ant with ergatoid queens
- Authors: Villet, Martin H
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6890 , http://hdl.handle.net/10962/d1011650
- Description: [From the text]: The present study reports on new observations on the reproductive biology of P. mandibularis, particularly the phenology of males, mating behaviour and colony founding, that may help in deciding between alternative explanations for the occurrence of ergatoid queens in this species.
- Full Text:
- Date Issued: 1999
- Authors: Villet, Martin H
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6890 , http://hdl.handle.net/10962/d1011650
- Description: [From the text]: The present study reports on new observations on the reproductive biology of P. mandibularis, particularly the phenology of males, mating behaviour and colony founding, that may help in deciding between alternative explanations for the occurrence of ergatoid queens in this species.
- Full Text:
- Date Issued: 1999
On two species of Paectira Karsch (Hemiptera: Cicadidae) from Kenya
- Authors: Villet, Martin H
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6850 , http://hdl.handle.net/10962/d1011131
- Description: During an ongoing revision of the genera of southern African Cicadidae (Hemiptera), examination of the holotype of Xosopsaltria fuliginosa Distant, 1905, showed that this species is not a member of Xosopsaltria Karsch, 1890, but that it belongs in the genus Paectira Karsch, 1890 (= Inyamana Distant, 1905). It is redescribed and illustrated here. As Heller's (1980) revision of this genus highlighted the paucity of records of species in this endemic East African taxon, details of material of Paectira jeanuaudi Boulard, 1977, from the Rhodes University Entomological Collection are recorded here. The specimens are in the Natural History Museum, London (BMNH), and the Albany Museum, Grahamstown (AMGS). All drawings were made using a Wild M5 stereomicroscope and camera lucida, and morphometric details of specimens were measured with vernier callipers. Anatomical terminology follows Boulard (1972) and Villet (1987,1997).
- Full Text:
- Date Issued: 1999
- Authors: Villet, Martin H
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6850 , http://hdl.handle.net/10962/d1011131
- Description: During an ongoing revision of the genera of southern African Cicadidae (Hemiptera), examination of the holotype of Xosopsaltria fuliginosa Distant, 1905, showed that this species is not a member of Xosopsaltria Karsch, 1890, but that it belongs in the genus Paectira Karsch, 1890 (= Inyamana Distant, 1905). It is redescribed and illustrated here. As Heller's (1980) revision of this genus highlighted the paucity of records of species in this endemic East African taxon, details of material of Paectira jeanuaudi Boulard, 1977, from the Rhodes University Entomological Collection are recorded here. The specimens are in the Natural History Museum, London (BMNH), and the Albany Museum, Grahamstown (AMGS). All drawings were made using a Wild M5 stereomicroscope and camera lucida, and morphometric details of specimens were measured with vernier callipers. Anatomical terminology follows Boulard (1972) and Villet (1987,1997).
- Full Text:
- Date Issued: 1999
Systematic status of Plectroctena mandibularis Smith and P. conjugata Santschi (Hymenoptera: Formicidae: Ponerini)
- Villet, Martin H, McKitterick, L, Robertson, H G
- Authors: Villet, Martin H , McKitterick, L , Robertson, H G
- Date: 1999
- Language: English
- Type: text , Article
- Identifier: vital:6893 , http://hdl.handle.net/10962/d1011653
- Description: Plectroctena mandibularis Smith is the type species of Plectroctena F. Smith. Because there has been some doubt about its distinctness from P. conjugata, several techniques were used to assess the systematic status of the two species. Most crucially, several colony series contained workers of both phenotypes, and where these series included queens or males, the distinguishing feature of these specimens was not consistently related to those of the workers. Queens, males and workers did not manifest qualitative differences between the taxa, and morphological variation was continuous between the two. The putative morphological basis (funicular index) for distinguishing workers of the taxa arose from allometric variation. Putatively diagnostic colour variation in males was related to latitude, but no simple pattern of morphological variation could be correlated with geographical distribution. Plectroctena conjugata is therefore considered a junior synonym of P. mandibularis.
- Full Text:
- Date Issued: 1999
- Authors: Villet, Martin H , McKitterick, L , Robertson, H G
- Date: 1999
- Language: English
- Type: text , Article
- Identifier: vital:6893 , http://hdl.handle.net/10962/d1011653
- Description: Plectroctena mandibularis Smith is the type species of Plectroctena F. Smith. Because there has been some doubt about its distinctness from P. conjugata, several techniques were used to assess the systematic status of the two species. Most crucially, several colony series contained workers of both phenotypes, and where these series included queens or males, the distinguishing feature of these specimens was not consistently related to those of the workers. Queens, males and workers did not manifest qualitative differences between the taxa, and morphological variation was continuous between the two. The putative morphological basis (funicular index) for distinguishing workers of the taxa arose from allometric variation. Putatively diagnostic colour variation in males was related to latitude, but no simple pattern of morphological variation could be correlated with geographical distribution. Plectroctena conjugata is therefore considered a junior synonym of P. mandibularis.
- Full Text:
- Date Issued: 1999
Personal autonomy : philosophy and literature
- Authors: Vice, Samantha Wynne
- Date: 1999
- Subjects: Autonomy (Philosophy) , Ishiguro, Kazuo, 1954- -- Remains Of The Day , James, Henry, 1843-1916. Portrait of a lady
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2723 , http://hdl.handle.net/10962/d1002853 , Autonomy (Philosophy) , Ishiguro, Kazuo, 1954- -- Remains Of The Day , James, Henry, 1843-1916. Portrait of a lady
- Description: Gerald Dworkin's influential account of Personal Autonomy offers the following two conditions for autonomy: (i) Authenticity - the condition that one identify with one's beliefs, desires and values after a process of critical reflection, and (ii) Procedural Independence - the identification in (i) must not be "influenced in ways which make the process of identification in some way alien to the individual" (Dworkin 1989:61). I argue in this thesis that there are cases which fulfil both of Dworkin's conditions, yet are clearly not cases of autonomy. Specifically, I argue that we can best assess the adequacy of Dworkin's account of autonomy through literature, because it provides a unique medium for testing his account on the very terms he sets up for himself - ie. that autonomy apply to, and make sense of, persons leading lives of a certain quality. The examination of two novels - Kazuo Ishiguro's The Remains of the Day and Henry James's The Portrait of a Lady - shows that Dworkin's explanation of identification and critical reflection is inadequate for capturing their role in autonomy and that he does not pay enough attention to the role of external factors in preventing or supporting autonomy. As an alternative, I offer the following two conditions for autonomy: (i) critical reflection of a certain kind - radical reflection, and (ii) the ability to translate the results of (i) into action - competence. The novels demonstrate that both conditions are dependent upon considerations of the content of one's beliefs, desires, values etc. Certain of these will prevent or hinder the achievement of autonomy because of their content, so autonomy must be understood in relation to substantial considerations, rather than in purely formal terms, as Dworkin argues.
- Full Text:
- Date Issued: 1999
- Authors: Vice, Samantha Wynne
- Date: 1999
- Subjects: Autonomy (Philosophy) , Ishiguro, Kazuo, 1954- -- Remains Of The Day , James, Henry, 1843-1916. Portrait of a lady
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2723 , http://hdl.handle.net/10962/d1002853 , Autonomy (Philosophy) , Ishiguro, Kazuo, 1954- -- Remains Of The Day , James, Henry, 1843-1916. Portrait of a lady
- Description: Gerald Dworkin's influential account of Personal Autonomy offers the following two conditions for autonomy: (i) Authenticity - the condition that one identify with one's beliefs, desires and values after a process of critical reflection, and (ii) Procedural Independence - the identification in (i) must not be "influenced in ways which make the process of identification in some way alien to the individual" (Dworkin 1989:61). I argue in this thesis that there are cases which fulfil both of Dworkin's conditions, yet are clearly not cases of autonomy. Specifically, I argue that we can best assess the adequacy of Dworkin's account of autonomy through literature, because it provides a unique medium for testing his account on the very terms he sets up for himself - ie. that autonomy apply to, and make sense of, persons leading lives of a certain quality. The examination of two novels - Kazuo Ishiguro's The Remains of the Day and Henry James's The Portrait of a Lady - shows that Dworkin's explanation of identification and critical reflection is inadequate for capturing their role in autonomy and that he does not pay enough attention to the role of external factors in preventing or supporting autonomy. As an alternative, I offer the following two conditions for autonomy: (i) critical reflection of a certain kind - radical reflection, and (ii) the ability to translate the results of (i) into action - competence. The novels demonstrate that both conditions are dependent upon considerations of the content of one's beliefs, desires, values etc. Certain of these will prevent or hinder the achievement of autonomy because of their content, so autonomy must be understood in relation to substantial considerations, rather than in purely formal terms, as Dworkin argues.
- Full Text:
- Date Issued: 1999
A review of Southern African kimberlites and exploration techniques
- Authors: Venter, Louis Johannes
- Date: 1999 , 2013-10-04
- Subjects: Kimberlite -- Africa, Southern , Diamonds -- Africa, Southern , Prospecting -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5033 , http://hdl.handle.net/10962/d1007278 , Kimberlite -- Africa, Southern , Diamonds -- Africa, Southern , Prospecting -- South Africa
- Description: The dissertation reviews the present knowledge regarding diamonds, from its formation in the lithospheric upper mantle at depths between 150 and 300 km, to its final valuation in terms of US$/carat by diamantaires in London, Antwerp, Tel Aviv and New York. The dissertation is divided into two complimentary sections. Section one focuses on the formation, emplacement, occurrence and characteristics of kimberlites and, when present, their associated trace amounts of diamonds. The section follows a logical sequence from the regional tectonic-, local structrual- and geodynamic controls on kimberlite formation and emplacement to the characteristics of individual kimberlite morphology, mineralogy, petrography and geochemistry. Finally, the environment or diamond formation, resorption and the characteristics that have led to the marketability of diamonds are discussed. Section two reviews the current exploration techniques used in locating diamondiferous kimberliies and the subsequent economic evaluation of these kimberlites. A brief history of known Southern African kimberlite occurrences, grades, tonnages, tectonic settings, ages and regional structural controls is given. The prospective countries mentioned are Angola, Botswana, Lesotho, South Africa, Swaziland, Tanzania and Zimbabwe. Exploration techniques considered are ; the application of a landscape analysis and investigation of the surface processes active in a given area, indicator mineral sampling (with reference to their mineralogy and exploration significance), remote sensing techniques (subdivided into satellite imagery and aerial photography), geophysical techniques (including the magnetic-, gravity-, electrical-, radiometric- and seismic methods as well as heat flow models), geochemical techniques, petrographic- and electron beam techniques as well as geobotanical- and geobiological techniques. Finally, a brief summary of current evaluation techniques employed on diamondiferous kimberlite deposits is presented. The review covers kimberlite sampling methods, sample processing, diamond grade distributions (with reference to the experimental variogram model, statistical methods used in grade distribution calculations as well as block definition and local grade estimation). Stone size distributions, including microdiamond counts and value estimation, are also discussed. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 1999
- Authors: Venter, Louis Johannes
- Date: 1999 , 2013-10-04
- Subjects: Kimberlite -- Africa, Southern , Diamonds -- Africa, Southern , Prospecting -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5033 , http://hdl.handle.net/10962/d1007278 , Kimberlite -- Africa, Southern , Diamonds -- Africa, Southern , Prospecting -- South Africa
- Description: The dissertation reviews the present knowledge regarding diamonds, from its formation in the lithospheric upper mantle at depths between 150 and 300 km, to its final valuation in terms of US$/carat by diamantaires in London, Antwerp, Tel Aviv and New York. The dissertation is divided into two complimentary sections. Section one focuses on the formation, emplacement, occurrence and characteristics of kimberlites and, when present, their associated trace amounts of diamonds. The section follows a logical sequence from the regional tectonic-, local structrual- and geodynamic controls on kimberlite formation and emplacement to the characteristics of individual kimberlite morphology, mineralogy, petrography and geochemistry. Finally, the environment or diamond formation, resorption and the characteristics that have led to the marketability of diamonds are discussed. Section two reviews the current exploration techniques used in locating diamondiferous kimberliies and the subsequent economic evaluation of these kimberlites. A brief history of known Southern African kimberlite occurrences, grades, tonnages, tectonic settings, ages and regional structural controls is given. The prospective countries mentioned are Angola, Botswana, Lesotho, South Africa, Swaziland, Tanzania and Zimbabwe. Exploration techniques considered are ; the application of a landscape analysis and investigation of the surface processes active in a given area, indicator mineral sampling (with reference to their mineralogy and exploration significance), remote sensing techniques (subdivided into satellite imagery and aerial photography), geophysical techniques (including the magnetic-, gravity-, electrical-, radiometric- and seismic methods as well as heat flow models), geochemical techniques, petrographic- and electron beam techniques as well as geobotanical- and geobiological techniques. Finally, a brief summary of current evaluation techniques employed on diamondiferous kimberlite deposits is presented. The review covers kimberlite sampling methods, sample processing, diamond grade distributions (with reference to the experimental variogram model, statistical methods used in grade distribution calculations as well as block definition and local grade estimation). Stone size distributions, including microdiamond counts and value estimation, are also discussed. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 1999
An exploration of the factors which promote and impede correctional supervision effectiveness with regard to the juvenile or youth offenders
- Authors: Van Zyl, Claudette
- Date: 1999
- Subjects: Juvenile corrections , Juvenile delinquency , Juvenile delinquents. , Social work with juvenile delinquents
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:709 , http://hdl.handle.net/10962/d1006529 , Juvenile corrections , Juvenile delinquency , Juvenile delinquents. , Social work with juvenile delinquents
- Description: Youth Crime is increasing at an alarming rate and imprisonment as the only measure of punishment has become a contentious issue for the South African Correctional Services. National and international awareness has been raised about young people at risk in the 1992 campaign" Justice for the children: No child should be caged". In the words of Ruth Morris: " Prisons are not the greatest. They breed bitterness and crime, destroy people who work and live in them and its not nice to cage your fellow human beings. Prisons cost more than the best university education, while giving appalling results". (1993 (1) SA 476). The question that needs to be asked is whether imprisonment really does effect the punitive motives of deterrence, retribution, protecting the community and rehabilitation of the offender. The introduction of correctional supervision as a sentencing option has ushered in a new phase in our criminal justice system. The South African Model of correctional supervision is described as a community-based sentence that is served within the community and the probationer is subject to stringent conditions such as house arrest, community service, monitoring and the attendance of treatment programmes. The study aimed to: * identify the variables that appear to be operating in determining the successful and or unsuccessful correctional supervision sentences with young offenders; (the terms effectiveness and successful are used interchangeably). * contribute to a better understanding of working with young offenders in the community and to make positive recommendations concerning their rehabilitation. The design applied in this study was the exploratory-descriptive design. It was exploratory since the field of correctional supervision at this stage is not well developed and descriptive because the researcher described features of this phenomenon. This was combined with an empirical investigation that explored the youths experience on correctional supervision. Another component of the empirical investigation consisted of how the parents or significant other as well as the supervision committee perceived the respondents adjustment on correctional supervision. The findings of the empirical investigation clearly showed that although the respondents found house arrest extremely difficult to comply with, their overall functioning and adjustment in the community was positive. Factors that emerged from the study that can promote a successful correctional supervision sentence were factors such as positive support systems that can instill discipline, no involvement in gangsterism, no family pathologies such as alcoholism, family violence and financial problems. Factors such as negative attitude of staff members, familial problems, stringent house arrest conditions, financial problems impeded the youths functioning on correctional supervision. The correctional social worker together with the multi-disciplinary team both have a cardinal role to play in the treatment of the young offender. The various professions with their expertise have a major role to play in the treatment programmes geared to assist the young offender to reintegrate and function positively in the community
- Full Text:
- Date Issued: 1999
- Authors: Van Zyl, Claudette
- Date: 1999
- Subjects: Juvenile corrections , Juvenile delinquency , Juvenile delinquents. , Social work with juvenile delinquents
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:709 , http://hdl.handle.net/10962/d1006529 , Juvenile corrections , Juvenile delinquency , Juvenile delinquents. , Social work with juvenile delinquents
- Description: Youth Crime is increasing at an alarming rate and imprisonment as the only measure of punishment has become a contentious issue for the South African Correctional Services. National and international awareness has been raised about young people at risk in the 1992 campaign" Justice for the children: No child should be caged". In the words of Ruth Morris: " Prisons are not the greatest. They breed bitterness and crime, destroy people who work and live in them and its not nice to cage your fellow human beings. Prisons cost more than the best university education, while giving appalling results". (1993 (1) SA 476). The question that needs to be asked is whether imprisonment really does effect the punitive motives of deterrence, retribution, protecting the community and rehabilitation of the offender. The introduction of correctional supervision as a sentencing option has ushered in a new phase in our criminal justice system. The South African Model of correctional supervision is described as a community-based sentence that is served within the community and the probationer is subject to stringent conditions such as house arrest, community service, monitoring and the attendance of treatment programmes. The study aimed to: * identify the variables that appear to be operating in determining the successful and or unsuccessful correctional supervision sentences with young offenders; (the terms effectiveness and successful are used interchangeably). * contribute to a better understanding of working with young offenders in the community and to make positive recommendations concerning their rehabilitation. The design applied in this study was the exploratory-descriptive design. It was exploratory since the field of correctional supervision at this stage is not well developed and descriptive because the researcher described features of this phenomenon. This was combined with an empirical investigation that explored the youths experience on correctional supervision. Another component of the empirical investigation consisted of how the parents or significant other as well as the supervision committee perceived the respondents adjustment on correctional supervision. The findings of the empirical investigation clearly showed that although the respondents found house arrest extremely difficult to comply with, their overall functioning and adjustment in the community was positive. Factors that emerged from the study that can promote a successful correctional supervision sentence were factors such as positive support systems that can instill discipline, no involvement in gangsterism, no family pathologies such as alcoholism, family violence and financial problems. Factors such as negative attitude of staff members, familial problems, stringent house arrest conditions, financial problems impeded the youths functioning on correctional supervision. The correctional social worker together with the multi-disciplinary team both have a cardinal role to play in the treatment of the young offender. The various professions with their expertise have a major role to play in the treatment programmes geared to assist the young offender to reintegrate and function positively in the community
- Full Text:
- Date Issued: 1999
The effect of combined vitamin E succinate and ascorbic acid supplementation on growth and cyclooxygenase expression in murine melanoma (BL6) cells
- Authors: Van Rooyen, Megan Lynne
- Date: 1999
- Subjects: Vitamin E , Vitamin C , Melanoma
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3982 , http://hdl.handle.net/10962/d1004041 , Vitamin E , Vitamin C , Melanoma
- Description: This thesis examines the effect of combined vitamin E succinate and Asc supplementation on the in vitro growth of a non-malignant monkey kidney (LLCMK) and a malignant melanoma (BL6) cell line, with nutritional concentration ranges of 5-20µg/ml and 25-50µg/ml respectively. Vitamin E and C are thought to interact synergistically to inhibit tumour cell growth by virtue of their antioxidant properties, whereby they quench free radicals and terminate lipid peroxidation. Furthermore vitamin E and C are thought to modulate the biosynthetic pathways in arachidonic acid metabolism at a number of different points. This may also offer a means of regulating tumour cell growth. It is well documented that vitamin E and C are distributed in the lipid and aqueous phases in the cell respectively. However, the cells need to obtain the vitamins from the environment in which they are found in order to exert a growth inhibitory effect. Supplementation of combined vitamin E succinate and Asc on BL6 and LLCMK cells resulted in a significant increase in LLCMK cell growth, and a significant decrease in cell growth was observed in BL6 cells. Vitamin E succinate in its esterified form cannot function as an antioxidant and requires the cleavage of the succinate to become an active antioxidant. The metabolism of vitamin E succinate to form free vitamin E in LLCMK and BL6 cells resulted in the cleavage of the succinate group from the vitamin E molecule in BL6 cells only, thus suggesting that an esterase may be present in BL6 cells. This would allow for a synergistic interaction between the two vitamins. The arachidonic acid cascade generates a family of bioactive lipids that modulate diverse physiological and pathological responses including tumour growth and promotion. The enzyme prostaglandin endoperoxide synthase (PGHS) or cyclooxygenase (Cox) is the key enzyme in the biosynthetic pathway leading to the formation of prostaglandins. Two enzyme isoforms of Cox have been identified, Cox 1 and Cox 2. Supplementation with vitamin E succinate and Asc at a combination 20:25µg/ml respectively resulted in a trend of increasing Cox activity over 12 hours suggesting that vitamin E and Asc have a stimulatory effect on Cox activity in BL6 cells. The inhibitors of Cox 2, dexamethasone, showed a decreasing trend in Cox activity at the 20:25µg/ml combination, while cycloheximide showed an initial stimulatory effect and then a gradual decrease in Cox activity. The elimination of the Cox activity by dexamethasone suggests that transcriptional regulation may be occurring in BL6 cells. We examined by Northern blot analysis whether combined supplementation of vitamin E succinate and Asc caused an elevation of Cox 2 RNA expression in BL6 cells. An inducible effect of Cox 2 was observed after 2 hours of supplementation with a combination of vitamin E succinate and Asc in BL6 cells, however the results are inconclusive and further studies are required to substantiate this finding.
- Full Text:
- Date Issued: 1999
- Authors: Van Rooyen, Megan Lynne
- Date: 1999
- Subjects: Vitamin E , Vitamin C , Melanoma
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3982 , http://hdl.handle.net/10962/d1004041 , Vitamin E , Vitamin C , Melanoma
- Description: This thesis examines the effect of combined vitamin E succinate and Asc supplementation on the in vitro growth of a non-malignant monkey kidney (LLCMK) and a malignant melanoma (BL6) cell line, with nutritional concentration ranges of 5-20µg/ml and 25-50µg/ml respectively. Vitamin E and C are thought to interact synergistically to inhibit tumour cell growth by virtue of their antioxidant properties, whereby they quench free radicals and terminate lipid peroxidation. Furthermore vitamin E and C are thought to modulate the biosynthetic pathways in arachidonic acid metabolism at a number of different points. This may also offer a means of regulating tumour cell growth. It is well documented that vitamin E and C are distributed in the lipid and aqueous phases in the cell respectively. However, the cells need to obtain the vitamins from the environment in which they are found in order to exert a growth inhibitory effect. Supplementation of combined vitamin E succinate and Asc on BL6 and LLCMK cells resulted in a significant increase in LLCMK cell growth, and a significant decrease in cell growth was observed in BL6 cells. Vitamin E succinate in its esterified form cannot function as an antioxidant and requires the cleavage of the succinate to become an active antioxidant. The metabolism of vitamin E succinate to form free vitamin E in LLCMK and BL6 cells resulted in the cleavage of the succinate group from the vitamin E molecule in BL6 cells only, thus suggesting that an esterase may be present in BL6 cells. This would allow for a synergistic interaction between the two vitamins. The arachidonic acid cascade generates a family of bioactive lipids that modulate diverse physiological and pathological responses including tumour growth and promotion. The enzyme prostaglandin endoperoxide synthase (PGHS) or cyclooxygenase (Cox) is the key enzyme in the biosynthetic pathway leading to the formation of prostaglandins. Two enzyme isoforms of Cox have been identified, Cox 1 and Cox 2. Supplementation with vitamin E succinate and Asc at a combination 20:25µg/ml respectively resulted in a trend of increasing Cox activity over 12 hours suggesting that vitamin E and Asc have a stimulatory effect on Cox activity in BL6 cells. The inhibitors of Cox 2, dexamethasone, showed a decreasing trend in Cox activity at the 20:25µg/ml combination, while cycloheximide showed an initial stimulatory effect and then a gradual decrease in Cox activity. The elimination of the Cox activity by dexamethasone suggests that transcriptional regulation may be occurring in BL6 cells. We examined by Northern blot analysis whether combined supplementation of vitamin E succinate and Asc caused an elevation of Cox 2 RNA expression in BL6 cells. An inducible effect of Cox 2 was observed after 2 hours of supplementation with a combination of vitamin E succinate and Asc in BL6 cells, however the results are inconclusive and further studies are required to substantiate this finding.
- Full Text:
- Date Issued: 1999
A critical examination of the policy and practice of the Methodist Church of Southern Africa regarding the readmission of ministers who have resigned or who have been discontinued as a result of divorce
- Authors: Van Niekerk, Ockert
- Date: 1999
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:21093 , http://hdl.handle.net/10962/6356
- Description: The scope and purpose of this research is the examination of the theology and practice of the Methodist Church of Southern Africa in matters relating to marriage, divorce and remarriage in ministry. The theology of the Methodist Church of Southern Africa is based on its understanding of the scriptural injunctions on these matters and the Wesleyan tradition. These are examined in some detail as is the one paper in existence produced by the church on the subject. This is the report by a committee appointed by the Conference of the Methodist Church of Southern Africa, convened by Dr Donald Cragg; M.A. (OX ON) D.Phil. (OXON). This document is referred to in this thesis as The Cragg Document. Section One of this thesis deals with research into the theology of the church. The practice of the church is examined using the recently completed study by the writer of the decided cases of the church in all disciplinary matters dealt with by Conference from 1957 to 1997. These were compiled from the existing record of Conference proceedings kept in the Methodist Connexional Office in Durban. This case precedent is included in a larger work also recently completed by the writer, namely A Handbook/or Disciplinary Committees. This book is in the process of being published by the church. Section two of this work deals with research into the practice of the church. The conclusions drawn at the end of this paper include a possible model for ministry to ministers and their families in the area of marriage and family enrichment and pastoral assistance to families in crisis. This thesis includes qualitative research into the aforesaid practice and procedure of the church in these matters and it is submitted that the conclusions drawn and the model posed in the concluding chapters can be of value to the church as it seeks to deal of the problem of an increasing number of ministers suffering the breakup of their homes and going through the trauma of divorce.
- Full Text:
- Date Issued: 1999
- Authors: Van Niekerk, Ockert
- Date: 1999
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:21093 , http://hdl.handle.net/10962/6356
- Description: The scope and purpose of this research is the examination of the theology and practice of the Methodist Church of Southern Africa in matters relating to marriage, divorce and remarriage in ministry. The theology of the Methodist Church of Southern Africa is based on its understanding of the scriptural injunctions on these matters and the Wesleyan tradition. These are examined in some detail as is the one paper in existence produced by the church on the subject. This is the report by a committee appointed by the Conference of the Methodist Church of Southern Africa, convened by Dr Donald Cragg; M.A. (OX ON) D.Phil. (OXON). This document is referred to in this thesis as The Cragg Document. Section One of this thesis deals with research into the theology of the church. The practice of the church is examined using the recently completed study by the writer of the decided cases of the church in all disciplinary matters dealt with by Conference from 1957 to 1997. These were compiled from the existing record of Conference proceedings kept in the Methodist Connexional Office in Durban. This case precedent is included in a larger work also recently completed by the writer, namely A Handbook/or Disciplinary Committees. This book is in the process of being published by the church. Section two of this work deals with research into the practice of the church. The conclusions drawn at the end of this paper include a possible model for ministry to ministers and their families in the area of marriage and family enrichment and pastoral assistance to families in crisis. This thesis includes qualitative research into the aforesaid practice and procedure of the church in these matters and it is submitted that the conclusions drawn and the model posed in the concluding chapters can be of value to the church as it seeks to deal of the problem of an increasing number of ministers suffering the breakup of their homes and going through the trauma of divorce.
- Full Text:
- Date Issued: 1999
A continuous process for the biological treatment of heavy metal contaminated acid mine water
- Van Hille, R P, Boshoff, G A, Rose, P D, Duncan, J R
- Authors: Van Hille, R P , Boshoff, G A , Rose, P D , Duncan, J R
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6464 , http://hdl.handle.net/10962/d1005793 , dx.doi.org/10.1016/S0921-3449(99)00010-5
- Description: Alkaline precipitation of heavy metals from acidic water streams is a popular and long standing treatment process. While this process is efficient it requires the continuous addition of an alkaline material, such as lime. In the long term or when treating large volumes of effluent this process becomes expensive, with costs in the mining sector routinely exceeding millions of rands annually. The process described below utilises alkalinity generated by the alga Spirulina sp., in a continuous system to precipitate heavy metals. The design of the system separates the algal component from the metal containing stream to overcome metal toxicity. The primary treatment process consistently removed over 99% of the iron (98.9 mg/l) and between 80 and 95% of the zinc (7.16 mg/l) and lead (2.35 mg/l) over a 14-day period (20 l effluent treated). In addition the pH of the raw effluent was increased from 1.8 to over 7 in the post-treatment stream. Secondary treatment and polishing steps depend on the nature of the effluent treated. In the case of the high sulphate effluent the treated stream was passed into an anaerobic digester at a rate of 4 l/day. The combination of the primary and secondary treatments effected a removal of over 95% of all metals tested for as well as a 90% reduction in the sulphate load. The running cost of such a process would be low as the salinity and nutrient requirements for the algal culture could be provided by using tannery effluent or a combination of saline water and sewage. This would have the additional benefit of treating either a tannery or sewage effluent as part of an integrated process.
- Full Text:
- Date Issued: 1999
- Authors: Van Hille, R P , Boshoff, G A , Rose, P D , Duncan, J R
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6464 , http://hdl.handle.net/10962/d1005793 , dx.doi.org/10.1016/S0921-3449(99)00010-5
- Description: Alkaline precipitation of heavy metals from acidic water streams is a popular and long standing treatment process. While this process is efficient it requires the continuous addition of an alkaline material, such as lime. In the long term or when treating large volumes of effluent this process becomes expensive, with costs in the mining sector routinely exceeding millions of rands annually. The process described below utilises alkalinity generated by the alga Spirulina sp., in a continuous system to precipitate heavy metals. The design of the system separates the algal component from the metal containing stream to overcome metal toxicity. The primary treatment process consistently removed over 99% of the iron (98.9 mg/l) and between 80 and 95% of the zinc (7.16 mg/l) and lead (2.35 mg/l) over a 14-day period (20 l effluent treated). In addition the pH of the raw effluent was increased from 1.8 to over 7 in the post-treatment stream. Secondary treatment and polishing steps depend on the nature of the effluent treated. In the case of the high sulphate effluent the treated stream was passed into an anaerobic digester at a rate of 4 l/day. The combination of the primary and secondary treatments effected a removal of over 95% of all metals tested for as well as a 90% reduction in the sulphate load. The running cost of such a process would be low as the salinity and nutrient requirements for the algal culture could be provided by using tannery effluent or a combination of saline water and sewage. This would have the additional benefit of treating either a tannery or sewage effluent as part of an integrated process.
- Full Text:
- Date Issued: 1999
Where has all the Geography gone? : a social constructivist perspective of Curriculum 2005
- Authors: Van Harmelen, U
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6092 , http://hdl.handle.net/10962/d1008614
- Description: The apparently tenuous position of geography in Curriculum 2005 suggests the need to reassess the nature and role of geographical education for the South African learner. The new curriculum is designed to provide a general education experience and this paper therefore considers geography's role within this framework. In so doing it raises questions that impact on the view we take of geography within Curriculum 2005 and explores the implications for teaching and learning within this educational band. For many learners in South Africa geography is seen as little more than 'book knowledge'. Not only has the content been de-contextualised from the learner's reality, but also the method of learning is largely dependent on the rote learning of a frightening array of facts from a single textbook or teacher designed notes. However, the learner-centred approach adopted by Curriculum 2005 creates considerable possibilities for the development of geographical understanding in the sense of making meaning, problem solving and the development of creative and critical thinking. The situation of geographical education in the GET band of Curriculum 2005 presents geography educators and teacher educators with considerable challenges and demands a radical shift in perspective in terms of what constitutes geographical knowledge in this band as well as its acquisition. The paper argues that a social constructivist approach within the 'new' systems theory, creates possibilities for learners to acquire the conceptual understanding, skills, values and attitudes needed as a foundation for further learning in geography and to enable them to function effectively and responsibly in space-place and time.
- Full Text: false
- Date Issued: 1999
- Authors: Van Harmelen, U
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6092 , http://hdl.handle.net/10962/d1008614
- Description: The apparently tenuous position of geography in Curriculum 2005 suggests the need to reassess the nature and role of geographical education for the South African learner. The new curriculum is designed to provide a general education experience and this paper therefore considers geography's role within this framework. In so doing it raises questions that impact on the view we take of geography within Curriculum 2005 and explores the implications for teaching and learning within this educational band. For many learners in South Africa geography is seen as little more than 'book knowledge'. Not only has the content been de-contextualised from the learner's reality, but also the method of learning is largely dependent on the rote learning of a frightening array of facts from a single textbook or teacher designed notes. However, the learner-centred approach adopted by Curriculum 2005 creates considerable possibilities for the development of geographical understanding in the sense of making meaning, problem solving and the development of creative and critical thinking. The situation of geographical education in the GET band of Curriculum 2005 presents geography educators and teacher educators with considerable challenges and demands a radical shift in perspective in terms of what constitutes geographical knowledge in this band as well as its acquisition. The paper argues that a social constructivist approach within the 'new' systems theory, creates possibilities for learners to acquire the conceptual understanding, skills, values and attitudes needed as a foundation for further learning in geography and to enable them to function effectively and responsibly in space-place and time.
- Full Text: false
- Date Issued: 1999
In search of self explorations of identity in the work of Paul Auster
- Van der Vlies, Andrew Edward
- Authors: Van der Vlies, Andrew Edward
- Date: 1999
- Subjects: Auster, Paul, 1947- -- Criticism and interpretation , Identity (Psychology) in literature
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2208 , http://hdl.handle.net/10962/d1002251 , Auster, Paul, 1947- -- Criticism and interpretation , Identity (Psychology) in literature
- Description: Paul Auster is regarded by some as an important novelist. He has, in a relatively short space of time, produced an intriguing body of work, which has attracted comparatively little critical attention. This study is based on the premise that Auster's art is the record of an entertaining, intelligent and utterly serious engagement with the possibilities of conceiving of the identity of an individual subject in the contemporary, late-twentieth century moment. This study, focussing on Auster's novels, but also considering selected poetry and critical prose, explores the representation of identity in his work. The short Foreword introduces Paul Auster and sketches in outline the concerns of the study. Chapter One explores the manner in which Auster's early (anti-),detective' fiction develops a concern with identity. It is suggested that Squeeze Play, Auster's pseudonymous 'hard-boiled' detective thriller, provided the author with a testing ground for his subsequent appropriation and subversion of the detective genre in The New York Trilogy. Through a close consideration of City of Glass, and an examination of elements in Ghosts, it is shown how the loss of the traditional detective's immunity, and the problematising of strategies which had previously guaranteed him access to interpretive and narrative closure, precipitates a collapse which initiates an interrogation of the nature and construction of ideas about individual identity. Chapter Two develops a suggestion that City of Glass was written in response to particular emotional concerns of the author by turning to an examination of the memoir-novel, The Invention of Solitude. This chapter examines the extent to which Auster's Jewishness is implicated in his understanding of identity, and in the techniques with which he expresses his concerns. It is argued that Auster's engagement with texts and memories important to him in order to find a voice adequate to the task which he assumes in The Invention of Solitude, reveals the ethical imperative of recognizing and accepting a relationship to alterity. The influence on Auster of certain Jewish writers, like Edmond Jabes, is considered in the course of the chapter. The third chapter addresses the issue of the description of Auster's work as postmodernist, in the light of what the study has presented as Auster's ethical engagement with alterity. Critical responses to Auster's texts are canvassed, before it is suggested that aspects of the ethical phenomenology of Emmanuel Levinas may be useful in considering these important issues in Auster's oeuvre. Chapter Four returns to a consideration of The New York Trilogy, examining its final part, The Locked Room, before discussing In the Country of Last Things and Moon Palace. All three novels are narrated by first-person narrators who, in very different situations, come (consciously and unconsciously) to negotiate their own identities in relation either to other people or to adverse circumstances. The chapter thus considers the manner in which these texts figure Auster's concern with relationships between individuals and otherness. Chapter Five seeks, as a means of concluding the study, to consider aspects of Auster's presentation of the manner in which identity is connected to perception, and to an engagement with that which is other than the self This chapter focuses on Auster's figuration of necessary responses to the otherness of the objective world and to chance as a radical alterity. Beginning with a consideration of an early essay, the chapter explores relevant aspects of Moon Palace, The Music of Chance, Leviathan and Mr Vertigo, considers elements in Auster's poetry, and demonstrates the usefulness of exploring the influence on his work of the 'objectivist' poets and aspects of Dada and Surrealist poetics. The seemingly punitive severity of the fates of some of Auster's protagonists is shown ultimately to be positive, and (potentially) redemptive, reflecting Auster's profoundly ethical conception of the responsibilities and possibilities of selfhood.
- Full Text:
- Date Issued: 1999
- Authors: Van der Vlies, Andrew Edward
- Date: 1999
- Subjects: Auster, Paul, 1947- -- Criticism and interpretation , Identity (Psychology) in literature
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2208 , http://hdl.handle.net/10962/d1002251 , Auster, Paul, 1947- -- Criticism and interpretation , Identity (Psychology) in literature
- Description: Paul Auster is regarded by some as an important novelist. He has, in a relatively short space of time, produced an intriguing body of work, which has attracted comparatively little critical attention. This study is based on the premise that Auster's art is the record of an entertaining, intelligent and utterly serious engagement with the possibilities of conceiving of the identity of an individual subject in the contemporary, late-twentieth century moment. This study, focussing on Auster's novels, but also considering selected poetry and critical prose, explores the representation of identity in his work. The short Foreword introduces Paul Auster and sketches in outline the concerns of the study. Chapter One explores the manner in which Auster's early (anti-),detective' fiction develops a concern with identity. It is suggested that Squeeze Play, Auster's pseudonymous 'hard-boiled' detective thriller, provided the author with a testing ground for his subsequent appropriation and subversion of the detective genre in The New York Trilogy. Through a close consideration of City of Glass, and an examination of elements in Ghosts, it is shown how the loss of the traditional detective's immunity, and the problematising of strategies which had previously guaranteed him access to interpretive and narrative closure, precipitates a collapse which initiates an interrogation of the nature and construction of ideas about individual identity. Chapter Two develops a suggestion that City of Glass was written in response to particular emotional concerns of the author by turning to an examination of the memoir-novel, The Invention of Solitude. This chapter examines the extent to which Auster's Jewishness is implicated in his understanding of identity, and in the techniques with which he expresses his concerns. It is argued that Auster's engagement with texts and memories important to him in order to find a voice adequate to the task which he assumes in The Invention of Solitude, reveals the ethical imperative of recognizing and accepting a relationship to alterity. The influence on Auster of certain Jewish writers, like Edmond Jabes, is considered in the course of the chapter. The third chapter addresses the issue of the description of Auster's work as postmodernist, in the light of what the study has presented as Auster's ethical engagement with alterity. Critical responses to Auster's texts are canvassed, before it is suggested that aspects of the ethical phenomenology of Emmanuel Levinas may be useful in considering these important issues in Auster's oeuvre. Chapter Four returns to a consideration of The New York Trilogy, examining its final part, The Locked Room, before discussing In the Country of Last Things and Moon Palace. All three novels are narrated by first-person narrators who, in very different situations, come (consciously and unconsciously) to negotiate their own identities in relation either to other people or to adverse circumstances. The chapter thus considers the manner in which these texts figure Auster's concern with relationships between individuals and otherness. Chapter Five seeks, as a means of concluding the study, to consider aspects of Auster's presentation of the manner in which identity is connected to perception, and to an engagement with that which is other than the self This chapter focuses on Auster's figuration of necessary responses to the otherness of the objective world and to chance as a radical alterity. Beginning with a consideration of an early essay, the chapter explores relevant aspects of Moon Palace, The Music of Chance, Leviathan and Mr Vertigo, considers elements in Auster's poetry, and demonstrates the usefulness of exploring the influence on his work of the 'objectivist' poets and aspects of Dada and Surrealist poetics. The seemingly punitive severity of the fates of some of Auster's protagonists is shown ultimately to be positive, and (potentially) redemptive, reflecting Auster's profoundly ethical conception of the responsibilities and possibilities of selfhood.
- Full Text:
- Date Issued: 1999