Aspects of the theory of human capital and its application to South African economic development
- Authors: Bates, Terrence
- Date: 1974
- Subjects: Human capital -- South Africa , South Africa -- Economic conditions -- 1961-1991
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1064 , http://hdl.handle.net/10962/d1007608 , Human capital -- South Africa , South Africa -- Economic conditions -- 1961-1991
- Description: Human capital is an important economic concept. The significance of human resource development, in the form of both education and health, has long been realised and was stressed even in the writings of the early economists. Introduction, p.1
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- Date Issued: 1974
The ecology of juvenile Rhabdosargus holubi (Steinachner) (Teleostei : Sparidae)
- Authors: Blaber, Stephen J M
- Date: 1974
- Subjects: Osteichthyes Fishes -- Breeding Fish populations Fish culture -- South Africa Estuaries -- South Africa -- Eastern Cape Aquatic ecology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5672 , http://hdl.handle.net/10962/d1005357
- Description: INTRODUCTION: Estuaries have received considerable attention from biologists in southern Africa in the past thirty years. Professor J.H. Day and the Zoology Department of the University of Cape Town have undertaken ecological surveys of a large number of estuaries of a variety of types, laying the important groundwork for more detailed studies of single species or problems. Their studies showed that the fish populations of southern African estuaries consist mainly of marine species. Why and when these species enter or leave the estuaries and whether they grow or breed in them were not established. The only relatively detailed study of a fish in southern African estuaries was that of Talbot (1955) who investigated aspects of the growth, feeding and reproduction of Rhabdosargus globiceps (Cuvier). No quantitative information has been published on any of the fish species, perhaps due to the difficulty of obtaining such data; results such as population estimates, mortality rates and growth rates are particularly unreliable when the area being investigated is in direct contact with the sea. Studies relating to even a single species of fish are hampered by immigration and emigration between estuary and sea, which make the population continuously variable. The larger estuaries are also difficult to sample adequately, especially with regard to netting, except perhaps on a very large scale using expensive commercial equipment. Along the southern African coast many of the smaller estuaries with a limited catchment area are cut off from the sea for most of the year due to erratic rainfall and longshore drift of sand. These closed or 'blind' estuaries of south eastern Africa, of which there are at least thirty in the eastern Cape Province, provide excellent areas for studying estuarine fish populations which enter when the estuary is open to the sea, but become isolated once it closes. These fish which become cut off in closed estuaries are subject to a new series of conditions. They are exposed to the wider temperature and salinity fluctuations of an estuary and they are forced to utilise the food resources of the estuary. Additionally they may be subjected to predation from piscivorous birds, and those predatory fish which are also cut off in the estuary. These factors will affect the size, mortality, and growth rates of a fish population. Since the fish are isolated no recruitment from the sea can take place, and any increase in numbers would have to come from breeding within the estuary. It is inevitable that the most numerous species should receive attention first. Rhabdosargus holubi (Steindachner) (Synonomy : Sargus holubi Stndr, Austrosparus tricuspidens Smith, Rhabdosargus tricuspidens (Smith))(Plate 1) is one of the most abundant fish in the estuaries of the eastern Cape Province. According to Smith (1965) it is endemic to southern Africa, occurring from the Cape to Zululand, being most common between Mossel Bay and East London. It is largely replaced by Rhabdosargus sarba (Forskal) in the north of its range and by Rhabdosargus globiceps (Cuvier) in the south. Commonly called the 'flatty' or silver bream it is considered only as being of nuisance value by fishermen, seldom exceeding 30 cm in length. In this study the ecology of R.holubi was examined in relation to the closed West Kleinemond estuary which is a small 'blind' estuary typical of those found along the eastern Cape coast. The growth, mortality and population size of R.holubi in this estuary were investigated and linked where possible with predation and detailed studies into the tolerances, food, and feeding of the species. It was not known at the commencement of the study whether breeding could occur in estuaries, although Smith (1965) stated that R.holubi does breed in estuaries. During the course of the sampling programme in the West Kleinemond estuary, measurements of the growth and population structure of two other species of fish were recorded for comparison with R.holubi: the sparid Lithognathus lithognathus (Cuvier) (White Steenbras) and the piscivorous carangid Hypacanthas amia (L.) (Leervis or garrick). Laboratory studies on R.holubi were possible due to the fact that large numbers of this species could be caught in eastern Cape estuaries and transported to Grahamstown, where they could be maintained in captivity for up to four months in recirculating seawater aquaria. During the course of the study over 2000 fish were kept in captivity at different times for a variety of experiments. Another 2500 were preserved for gut analyses and lipid determinations, while over 5000 were captured, examined and released in the field.
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- Date Issued: 1974
The economic structure of the Cape Midlands and Karroo Region : a sectoral and spatial survey
- Authors: Blumenfeld, Jesmond P
- Date: 1974
- Subjects: South Africa -- Economic conditions -- 1961-1991 , Regional planning -- South Africa -- Cape Province
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:1066 , http://hdl.handle.net/10962/d1007660 , South Africa -- Economic conditions -- 1961-1991 , Regional planning -- South Africa -- Cape Province
- Description: [The] region, as defined, excludes not only these metropolitan areas themselves but also the inner peripheries of their hinterlands. Thus, virtually all areas within regular (i. e. daily) commuting distance of the metropolitan centres, and all areas into which urban development in the latter might 'spill over' in the foreseeable future are excluded. In the case of Metropolitan Port Elizabeth, these exclusions are reflected in the roughly 'crescent-shaped' southern boundary of the region. The situation of the region can further be described in terms of its major physiographic features which reveal a number of factors which are also of importance for understanding and analysing the economy of the area. Intro., p. 1.
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- Date Issued: 1974
Social criteria in the drama of Molìère
- Authors: Brooks, Beverley Anne
- Date: 1974
- Subjects: Molière, 1622-1673 -- Criticism and interpretation
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3627 , http://hdl.handle.net/10962/d1009758
- Description: It is by no means an easy task to analyse and interpret the work of a dramatist such as Molière, for an interval of three hundred years inevitably blurs our perspective of the man and his intentions. We find ourselves unconsciously reading more into his lines than he possibly meant us to. We are tempted to attach significance to certain words and disregard others, in an arbitrary fashion. We try to reconstruct Molière's attitude towards his contemporaries and theirs to him, from evidence that is often flimsy and seldom reliable. Molière's very identity has been questioned to the extent that the authorship of his plays has been variously attributed to such different personalities as Louis XIV and the great Corneilleo. To these problems is added a further complication when one embarks upon a thesis dealing with the picture of society as it emerges from Molière's plays. Not only are we confronted with the difficulty of interpretation already mentioned, but also with the vastly different way in which pre-enlightenment man regarded social and political institutions. We of the twentieth century tend to take for granted the notions of liberty, fraternity, and equality. Had anyone formulated such ideas in the seventeenth century, it is doubtful whether they would have been accepted, since they contradict the very concept upon which society was based in the age of Louis XIV. This concept, broadly speaking, is that of a strict hierarchy in which everyone has his own appointed place. Obviously the notion of a hierarchy pre-supposes the inferiority of some and the superiority of others in the social structure of the day; and post-enlightenment thinking does not readily accept that some men should be privileged and others regarded as belonging naturally to the lower orders. Intro., p. 1-2.
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- Date Issued: 1974
Decorative aspects of reality with reference to sociological painting
- Authors: Clark, Dorothy
- Date: 1974
- Subjects: Decorative arts
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2474 , http://hdl.handle.net/10962/d1010501
- Description: The writer could not blame the reader for finding the title to this essay couched in somewhat academic terms. It must be said immediately that the title is a fake -- or that the following essay is a fake; the title has pretensions to the academic -- the essay has not. All academicism no longer has an independent existence -- it operates by formulae, is mechanical, uses faked sensations and vicarious experience and borrows its tricks and themes from a mature, established culture close at hand. This ' culture's life's blood is looted, given new twists, watered down and served up in academic terms. For these reasons, academicism and Kitsch are the same -- both change according to style and yet are always the same; both are the epitome of all that is spurious in our time. So, academicism could be said to be the 'stuffed shirt-front' for Kitsch. Preamble, p. 1.
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- Date Issued: 1974
The Grahamstown Fine Art Association
- Authors: Cook, J C W
- Date: 1974
- Subjects: Grahamstown Fine Art Association Rhodes University -- History Artists -- South Africa Painters -- South Africa Rhodes University -- School of Art
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2476 , http://hdl.handle.net/10962/d1010601
- Description: When he opened the 24th annual exhibition of students' work on the 1st July, 1927, Professor F.W. Armstrong gave the following account of the beginnings of the Grahamstown School of Art: ... The appointment of a master was the responsibility of Sir Langham Dale, the Superintendent General of Education in the Cape Colony. His choice for the first art master of the Grahamstown School of Art was Mr.W. H. Simpson. Simpson had studied at the South Kensington Museum then at the Royal Academy. During the 1870's he had exhibited in the Royal Academy, at other exhibitions in London, and in the provinces. Intro. p. 1.
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- Date Issued: 1974
Rhodesian African art, 1857-1974
- Authors: Des Fontaine, Fayne
- Date: 1974
- Subjects: Art, African Art -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2481 , http://hdl.handle.net/10962/d1011136
- Description: ART is life, and life is for living. This is the essential function of Mankind. Everything interrelates. African life and thought are inseparable. Art is an implement of power; it bridges the gap between Man and his Gods, and Man and Nature. The ability to understand art, does not depend on the ability to see and appreciate but to understand the culture of the people, to know the past). When considering AFRICAN ART, one can be sure that the ART OF RHODESIA is certainly the last to come to one's mind; that is, if one excludes the Prehistoric Artist of Rhodesia and the ART of the Zimbabwian culture, and concentrates on ART executed after the PIONEER PERIOD (circa 1857) to the turn of the century. Comparatively little has been written on the aspect of local art, and when it bas, it is primarily concerned with SHONA SCULPTURE. Rhodesian art is primarily functional, and the range of materials as well as the range of techniques are equally vast. The art of sculpture and carving particularly in wood, is a well-known characteristic of Africa. Rhodesia, however, does not offer such a vast selection of traditional art today, whether in wood, stone or metal. The carvers in Rhodesia, unlike those of some African States have long since downed their tools as there are no longer the rituals that at one time inspired the artist. These rituals have almost died out and the Kings that were his patrons have been out of power for centuries. The destruction of traditional African values is inevitable because of cultural change, white civilization, and more recently, ex:ploi ta tion has forced the traditional carver to become a carpenter or to join a co-operative in order to provide Tourist Art. Intro., p. 1.
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- Date Issued: 1974
The council of advice at the Cape of Good Hope, 1825-1834: a study in colonial government
- Authors: Donaldson, Margaret E
- Date: 1974
- Subjects: South Africa -- History -- To 1836 Great Britain -- Colonies -- Administration Cape of Good Hope (South Africa) -- History -- 1795-1872
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2603 , http://hdl.handle.net/10962/d1011220
- Description: The Council of Advice first emerged as a constitutional device for colonial rule in colonies captured by Britain during the wars against France between 1793 and 1814. The search for some new form of government for colonies of conquest had been necessitated by the difficulty generally experienced in assimilating formerly foreign colonies into the traditional British pattern of representation. Experience in Quebec between 1764 and 1791 had led to the gradual recognition of conciliar government as a workable substitute to bridge the gap between military rule and the grant of representative institutions. Between 1794 when a Council of Advice was first introduced in the island of San Domingo, and 1825, when the Cape of Good Hope was granted a council of this type, the composition, function and scope of such councils was gradually defined and elaborated. There was a continual interplay of precedent and example from one colony to another, facilitated by the growth of the Colonial Office in London during the early decades of the 19th Century. Councils of Advice were also introduced into some a-typical colonies of settlement, notably New South Wales, where the particular circumstances of the colony gave rise to the further development of the conciliar pattern of government, influenced by the practical experience in Quebec prior to 1791. Thus the Council of Advice at the Cape of Good Hope from 1825-1834 was but one example of an instrument of government which was being widely used in the British empire, and which was still developing in form and function during the period under consideration. The Council of Advice at the Cape reflects this fluidity. The composition of the council was altered on several occasions during the nine years of its existence; the degree of independence allowed to council members was a question which arose on several occasions, especially in relation to discussion of policy decisions taken in London; moreover, the council met at the discretion of the governor and four different men held this office during the period 1825-34, each with his own individual idea of the function and value of a council of advice. Preface, p. 1-2.
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- Date Issued: 1974
'n Ondersoek na Afrikaanse beskouings oor die kortverhaal met besondere verwysing na enkele nuwer Afrikaanse verhale
- Authors: Du Toit, P A
- Date: 1974
- Subjects: Short stories, South African (Afrikaans) -- History and criticism
- Language: Afrikaans
- Type: Thesis , Masters , MA
- Identifier: vital:3628 , http://hdl.handle.net/10962/d1011504 , Short stories, South African (Afrikaans) -- History and criticism
- Description: Dit is reeds deur andere gese: dat die "vernuwing van Sestig" in die Afrikaanse prosa die Afrikaanse prosakritiek tot bestekname gedwing het soos die vernuwing in die poësie van Dertig die kritiek van daardie tyd. En waar die vernuwing in die prosa ook op die gebied van die kort prosakuns so duidelik op die voorgrond was, kan daar wel gevra word: hoe geldig is die teorieDit is reeds deur andere gess: dat die "vernuwing van Sestig" in die Afrikaanse prosa die Afrikaanse prosakritiek tot bestekname gedwing het soos die vernuwing in die poesie van Dertig die kritiek van daardie tyd. 2 En waar die vernuwing in die prosa ook op die gebied van die kort prosakuns so duidelik op die voorgrond was, kan daar wel gevra word: hoe geldig is die teorieë wat in Afrikaans so eksplisit oor die "kortverhaal" opgestel is vir die nuwer Afrikaanse verhaalkuns? en daarby: hoe geldig is die nuwer, meer teksgerigte beskouings in Afrikaans? Die vraag is die kern van die huidige studie.
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- Date Issued: 1974
Martin Luther's attack on monasticism
- Authors: Enslin, Donovan Bryan
- Date: 1974
- Subjects: Luther, Martin, 1483-1546 -- Influence Luther, Martin, 1483-1546 -- Criticism and interpretation Monastic and religious life -- History Monasticism and religious order Monasteries
- Language: English
- Type: Thesis , Bachelor , BDiv
- Identifier: vital:1251 , http://hdl.handle.net/10962/d1011766
- Description: No comprehensive study of Luther's attitude towards monasticism is available in English. Most of the English works on Luther devote only a few pages or part of a chapter to this aspect of his life. Two reasons account for the cursory treatment. First, concern with the great themes of Luther's theology has led (Protestants at least) to concentrate on the theological aspects of his critique monasticism as a denial of the free grace of God, and as involving a mistaken view of perfection. Pelikan has commented: "Valid though this concentration on the theological aspects of Luther's polemic against monasticism is, it may obscure the bearing of that polemic upon the structures of the church." Moreover, a concern for theology 'pure and simple': (if such is possible) has led to a tendency to arrive at Luther's view of monasticism by a process of deduction from his great theme of justification by grace through faith alone, so that many of the niceties of his position, and especially the gentleness of his approach, have been obscured. Second, the cursory treatment is possible because there is a real sense in which the arguments Luther adduced in his major work on monasticism - though comprehensive and systematic - were by no means original. Yet, The Judgement of Martin Luther on Monastic Vows was the most decisive critique of monasticism ever presented. Summary, p. 2-3.
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- Date Issued: 1974
A share in pain and passion: the women of Synge's plays
- Authors: Finn, Stephen Michael
- Date: 1974
- Subjects: Synge, J. M. (John Millington), 1871-1909 , English literature -- Irish authors -- History and criticism , English drama -- Irish authors -- History and criticism
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2295 , http://hdl.handle.net/10962/d1011865 , Synge, J. M. (John Millington), 1871-1909 , English literature -- Irish authors -- History and criticism , English drama -- Irish authors -- History and criticism
- Description: Synge's plays contain some of the most arresting figures in modern drama, his characterization second only to his unique language, the most striking feature of his writing. Of the men, only Christy Mahon and Martin Doul stand out but the women form a brilliant company usually overshadowing the other characters. Chapter 1, p. 1.
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- Date Issued: 1974
Towards explanation in African linguistics : inaugural lecture delivered at Rhodes University
- Authors: Fivaz, Derek
- Date: 1974
- Subjects: Rhodes University -- History , African languages -- Study and teaching , Linguistics -- Study and teaching -- South Africa
- Language: English
- Type: Text
- Identifier: vital:624 , http://hdl.handle.net/10962/d1020693 , ISBN 0949980536
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
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- Date Issued: 1974
A study of the burrowing sandprawn Callianassa kraussi Stebbing (Crustacea - Decapoda - Thalassinidea)
- Authors: Forbes, Anthony Tonks
- Date: 1974
- Subjects: Estuarine biology -- South Africa Shrimps -- South Africa Decapoda (Crustacea) -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5850 , http://hdl.handle.net/10962/d1011866
- Description: The distribution of Callianassa kraussi in southern Africa extends from Lamberts Bay on the west coast to San Martinho in Mocambique. This represents a northerly extension of the range from the previous known limit of Inhaca Island. In this area 59 localities were visited and records obtained for an additional 16. Three areas were selected for detailed study. These were the west Kleinemonde estuary, which is normally closed off from the sea by a sand bar and the open Swartkops estuary both on the southeastern Cape coast, and the Swartvlei system, which consists of a lake connected to the sea by a channel which closes intermittently, on the southern Cape coast. The nature of the burrows constructed by C. kraussi was investigated in these areas. Burrow complexes may have up to nine entrances but more commonly two to four. Laboratory studies suggest that the number of entrances does not exceed the number of prawns present and consequently burrow opening counts will give an estimate of population density. Water movement can result in the closing off of burrows while strong water and sand movement will exclude C.kraussi from an area. C.kraussi is also excluded from areas which have very coarse substrates. A three year regular sampling program showed that C.kraussi breeds mainly in winter/spring with a smaller breeding peak in summer. Egg development time at 20°C in a salinity of 35° /₀₀ is 30-33 days. There are two larval stages which last 3-5 days. Development time of the eggs is tripled at temperatures of 13-15°C while larval development time is extended to 9-14 days. Development is possibly slightly accelerated at 25 ± 3°C but the number of eggs hatching is markedly reduced. Larval development times were similar to those at 20° and 35°/₀₀. There are no planktonic larval stages. Growth was more rapid and greater size was attained in the open Swartkops estuary than in the closed Kleinemonde estuary. Prawns hatching in winter/spring breed for the first time in the following summer at an age of about 16 months and then again in the following winter/spring at an age of about 2 years. Prawns hatching in summer breed in the following winter at an age of about 18 months and then again in the immediately following summer. Longevity in both sexes is about 2 years. Dispersal is accomplished by migration of the post-larval juvenile phases at an age of 3-5 months. Non-selfmaintaining populations exist in areas where salinities are too low to permit breeding. Population densities were found to vary markedly in different areas. Investigations of osmotic and ionic regulation showed that C.kraussi is a strong hyper-regulator and thus distinct from any other known species in the genus. Volume regulatory ability is well developed and depends on variable rates of urine production. Salt loss in dilutions occurs almost equally via the gills and the urine. The general responses of C.kraussi to dilutions of sea water are discussed. Various suggestions for conservation measures based on the distribution and iife cycle of C.kraussi were made. The factors affecting the distribution of C.kraussi are discussed. The problem of the larval development in C.kraussi was discussed in relation to reviews of larval types of benthic invertebrates. The importance of the burrow, the possible route by which C.kraussi has invaded estuaries and the differences between open and closed estuaries as shown by the effects on C.kraussi were discussed.
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- Date Issued: 1974
A structural investigation of the short stories of Katherine Mansfield with special reference to the idea of the true and false self
- Authors: Geldenhuys, M F
- Date: 1974
- Subjects: Mansfield, Katherine, 1888-1923 -- Criticism and interpretation , Short stories , Self in literatur
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2296 , http://hdl.handle.net/10962/d1011969
- Description: A survey of the available literature on Katherine Mansfield has shown that, in the five decades which have elapsed since the author's death, critical interest has gradually, but significantly, altered its direction. Despite the workmanlike assessments of such critics as David Daiches in Britain and Andre Maurois in France, and the recognition of her mastery of the short story form by such fellow practitioners of the art as H.E. Bates and Elizabeth Bowen, the mainstream of criticism tended, in the first decades after the author's death, to centre less upon the characteristics of the work itself than upon a cult- like fascination, initiated, perhaps, by the perceptive but over-interested pen of Middleton Murry. Only more recently has this tendency been superseded by a more rigorous scrutiny of the stories themselves; thus the excellence of the author 's technique has now become a major concern. Recent recognition has been accorded, too, to the fact that the stories were in the vanguard of their time with regard to the choice of, as well as the treatment of, theme. Intro. p. 1-2.
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- Date Issued: 1974
John Wesley's means of evangelism
- Authors: Gribble, James
- Date: 1974
- Subjects: Wesley, John, 1703-1791 Evangelistic work Methodist Church -- Doctrines
- Language: English
- Type: Thesis , Bachelor , BDiv
- Identifier: vital:1255 , http://hdl.handle.net/10962/d1012096
- Description: This essay is an attempt to evaluate the methods of evangelism used by John Wesley during the course of his long ministry in the eighteenth century. Wesley's methods are important, since by their use he exercised a remarkable influence upon the religious and social life of eighteenth-century England. They have a continuing importance, too, for a Church that wants to carry out her Lord's "Great Commission" effectively. In the history of the Church Wesley stands in the front rank of those who have significantly carried forward the mission of the Church. Therefore we do well to pause and learn what we can from his example and experience. Intro., p. 1.
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- Date Issued: 1974
Ligand substitution effects in uranyl ο-hydroxyarylcarbonyl complexes
- Authors: Haigh, John M
- Date: 1974
- Language: English
- Type: text , Article
- Identifier: vital:6372 , http://hdl.handle.net/10962/d1006075
- Description: Twenty-two base adducts of uranyl o-hydroxyarylcarbonyl complexes [UO2L2B] (L = o-hydroxyarylcarbonyl compound, B = H2O, pyridine, pyridine N-oxide) have been prepared. Pure field substituent parameters are used to derive a quantitative order of the electronic effects of the chelate ring substituents. Values of v(U=O) correlate well with these values. Evidence is cited suggesting almost complete non-aromaticity of the chelate ring, and the transmission of the electronic effects of the chelate ring substituent through the uranium atom in the pyridine and pyridine N-oxide base adducts.
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- Date Issued: 1974
A contribution to the biology of Pseudodiaptomus hessei (Mrázek) (Copepoda : Calanoida) in Lake Sibaya, South Africa
- Authors: Hart, Robert Clynton
- Date: 1974
- Subjects: Copepoda -- South Africa Freshwater biology -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5854 , http://hdl.handle.net/10962/d1012210
- Description: Aspects of the biology of the calanoid copepod Pseudodiaptomus hessei are described, with particular reference to its vertical migratory behaviour. The present investigations were carried out largely by means of Nansen-type plankton nets, but several new pieces of apparatus were developed and. are described herein. The daytime vertical distribution of P. hessei varies according to developmental stage and depth of water. In shallow areas of the lake the entire population is benthic or in very close association with the lake bed. In the deepest part of the lake (40m) the naupliar and early (i.e. C I - C III) copepodite stages are essentially pelagic, but the adult and late (i.e. C IV - C V) copepodite stages are predominantly benthic and may be quiescent or infaunal. During the hours of darkness, the calanoids are distributed through the water column. The nauplii are consistently abundant in the surface waters but the distribution of the other stages is not regular. The distribution can be related to lunar intensity in many cases, with the post-naupliar stages frequently occurring deeper in the water column on bright moonlight nights and in the surface waters on overcast moolnless nights. The dusk ascent and dawn descent of the calenoids is clearly related to changes in light penetration in most individuals. The movements of a fraction of the adults occur in the apparent absence of adequate light cues. This behaviour is shown more extensively by the adult females. An endogenous activity rhythm has been shown in the species under laboratory conditions and it is suggested that this may play a part in the migratory movements. A basic examination of the feeding methods, feeding appendages and food sources of adult and late copepodite stages has been made. Changes in feeding intensity through twenty-four have been examined in the field and under laboratory conditions. Using as an index of feeding intensity, the proportion of animals with food in their guts, it has been shown that a pronounced diel difference occurs in adult calanoids in the lake. Feeding is almost entirely restricted to the nocturnal presence of the calanoids in the water coloumn. This difference exists in the pre-adult copepodite stages, but is not nearly as striking. The absence of feeding during daylight is not readily accounted for in terms of food availability and it is attributed to the quiescent or possible infaunal existence of the adults. A periodicity in egg hatching has been shown Naupliar release from the parental egg sac is predominantly a nocturnal phenomenon in the hot and cool seasons. It is suggested that this may be important in attaining a favourable vertical distritution for the nauplii, and may be important in the distribution of the species. A preliminary acccunt of the seasonal cycle and population dynamics of P. hessei is given, based on data collected over two years at a single station. Seasonal changes in calanoid abundance are intermediate between those recorded in truly tropical areas and in temperate latitudes. Potential food sources show relatively little change. The vertical migration of P. hessei is considered in relation to its apparent ecological significance and comparisons are drawn with observations made on the same species or other pseudodiaptomids in estuaries and lagoons elsewhere.
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- Date Issued: 1974
Effects of precipitating electrons in the ionosphere
- Authors: Haschick, Aubrey D
- Date: 1974
- Subjects: Electrons , Electron precipitation , Ionosphere , Ionospheric electron density
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5526 , http://hdl.handle.net/10962/d1012220
- Description: As early as 1896, around the time of the discovery of the electron by J.J. Thompson, Birkeland was led to propose that aurorae were caused by fast moving electrons or similarly charged particles emitted by the sun and 'sucked in towards' the auroral zones by the geomagnetic field. He later supported this idea by firing electrons at a dipole field surrounding a sphere covered with a fluorescent coating. Extensive ground based observations of auroral features eventually led, in 1950, to the initial direct evidence of the fact that auroral emissions are due to energetic charged particles, consisting partly of protons, entering the earth's atmosphere (Meinel, 1951). However, it was only in 1952 and 1953 that the first measurements of what was later interpreted as bremsstrahlung X- rays from precipitating electrons were made at auroral latitudes. (Meredith et aI, 1955) During the IGY, 1957 - 1958, a number of rockets were fired through and near, visible aurorae and large fluxes of low energy electrons were detected ... Intro., p. 1.
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- Date Issued: 1974
The musical life of Henry Hare Dugmore, 1820 settler
- Authors: Henderson, Jenifer M
- Date: 1974
- Subjects: Dugmore, H H (Henry H), 1810-1897
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:2682 , http://hdl.handle.net/10962/d1012262
- Description: Henry Hare Dugmore, the eldest son of Isaac and Maria, was destined to play his part in the dramatic future of his adopted country; not only to help as an artisan and a farmer, but to build in the spiritual field as an influential missionary and in the academic field as a most capable lecturer; most important of all, in the Artistic field as a Poet and a Musician.
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- Date Issued: 1974
Sociology : promise and problems : inaugural lecture delivered at Rhodes University
- Authors: Higgins, Edward
- Date: 1974
- Subjects: Sociology
- Language: English
- Type: Text
- Identifier: vital:636 , http://hdl.handle.net/10962/d1020705 , ISBN 0949980501
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
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- Date Issued: 1974