http://vital.seals.ac.za:8080/vital/access/manager/Index ${session.getAttribute("locale")} 5 A Combined Experimental and Computational Study of Hydridospirophosphorane Ligand Systems Featuring Halogenated Mandelic Acids http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:71911 Wed 27 Mar 2024 10:39:41 SAST ]]> Modelling African swine fever disease in domestic pigs with culling and removal of contaminated feeds http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:53895 Wed 27 Jul 2022 12:54:32 SAST ]]> Refining predator-prey preference at the prey demographic level for cheetah and lion http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:53880 Wed 27 Jul 2022 11:35:40 SAST ]]> Pleistocene vertebrate trace fossils from the Cape south coast of South Africa: inferences and implications http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:65942 Wed 26 Jul 2023 15:22:10 SAST ]]> Moult and energetics in three species from the Euplectes genus representing a gradient of elaborate plumage ornamentation http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62734 Wed 22 Mar 2023 13:07:03 SAST ]]> Investigation of thermal and electrical characteristics of crystalline silicon photovoltaic modules under varying operational conditions http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62733 Wed 22 Mar 2023 12:56:43 SAST ]]> A model to predict the development of preeclampsia in South African women http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62724 Wed 22 Mar 2023 11:40:43 SAST ]]> Converged data and sensing over optical fiber networks http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62722 Wed 22 Mar 2023 10:39:20 SAST ]]> Seasonal changes of metals in the salt marsh and seagrass beds of the Swartkops Estuary http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:53411 S. maritima > S. tegetaria. Moreover, unvegetated (bare sediment) showed much lower metal concentrations compared to the rhizosediment, indicating that the vegetation trapped small particles, and changes the physical environment to concentrate metals in their rhizosphere. Lastly, the plant species all displayed good accumulation of metals in their roots, while Z. capensis also showed remarkable uptake to its leaves. The study identified S. maritima and S. tegetaria as good phytostabilisers, particularly the latter with its vi high metal stocks and slow root turnover rate. The compartmentalization in these plants were unique to each species, corroborating previous assessments that compartmentalization cannot be compared between similar life forms and genera. These results contribute to local and international research on biogeochemistry in wetlands, and assessment of pollution in developed estuaries. Of note is Z. capensis, an endemic Southern African species, which has not been analysed for compartmentalization of metals before. All three of the studied species have potential as metal accumulators, and therefore a sink of metals. They localize the metals, limiting bioaccumulation to the rest of the food chain, which reduces the ecotoxic effect of metals in the environment. Higher accumulation in vegetated (rhizosediment) over bare sediment, make these habitats valuable metal sinks. This increases their importance in estuaries receiving high pollution loads, and they should be prioritized in conservation efforts. Two sites within the Swartkops Estuary, Tippers’ Creek (Site 4) and the Launch Site (Site 3), are potential sites for long-term monitoring due their capacity to trap and accumulate metals. The results of this study will inform local management on the state of metals in the Swartkops Estuary, providing crucial information on the importance of preserving local wetlands for the purpose of regulating toxic levels of metals in the ecosystem.]]> Wed 20 Jul 2022 00:51:30 SAST ]]> A case study on the incidence and extent of medullated and coloured fibres in the commercially produced South African wool clip 2010 – 2017 http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:52002 Wed 19 Oct 2022 14:21:27 SAST ]]> The use of psychometric test systems as a pre-selection tool for identifying successful harvesting machine operators http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:51102 Wed 18 May 2022 11:56:56 SAST ]]> Comparison of in vitro activities of selected Ganoderma species in relation to skin diseases http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69766 Wed 15 Nov 2023 12:29:00 SAST ]]> An evaluation of the effectiveness of area-based conservation intervention in avoiding biodiversity loss in South Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69765 Wed 15 Nov 2023 11:34:54 SAST ]]> An evaluation of the effectiveness of area-based conservation interventions in avoiding biodiversity loss in South Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69762 Wed 15 Nov 2023 10:45:02 SAST ]]> Investigating the role of UAVs and convolutional neural networks in the identification of invasive plant species in the Albany Thicket http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69755 Wed 15 Nov 2023 10:01:01 SAST ]]> Interactive visualisation of electricity usage in smart environments http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:70687 Wed 13 Mar 2024 14:06:06 SAST ]]> An efficient approach for the synthesis of dolutegravir and its analogue exploiting flow chemistry http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:70635 Wed 13 Mar 2024 14:05:11 SAST ]]> Using spatial explicit capture-recapture model to investigate the demography and spatial dynamics of lion prides in Pilanesberg National Park http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62318 1 year) with a density of 8.8 lions per 100 km2 . The estimated mean home range size of male lions was 279 km2 with a highest probability density (HPD) range of 179 – 385 km2 . The estimated mean home range of female lions was 191 km2 with a HPD range of 135 – 262 km2 . The larger home range size for male lions and smaller home range size for females is found v throughout the African continent in protected areas. The estimated sex ratio was 0.9♀:1♂, which is unexpected as PNP sex ratios between male and female lions is usually 2♀:1♂. A future sampling design for PNP was produced from the completed lion survey dataset. I drove a total of 7350 km and evaluated the influence of varied sampling efforts (i.e., kms driven) on precision estimates and relative bias for abundance, movement, and sex ratio. I found that a minimum of 4 000 km was needed to adequately estimate the lion abundance, movement, and sex ratio in this small fenced protected area. These findings can be used to help guide management to the most cost-effective sampling method and still obtain accurate estimates for monitoring lions. By showing management what is required for appropriate lion surveys this might help improve future monitoring.]]> Wed 13 Mar 2024 11:40:30 SAST ]]> Investigating thermoregulatory responses of rhabdomys pumilio at high wet-bulb temperatures http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:68916 Wed 11 Oct 2023 10:52:24 SAST ]]> Chemical analysis of selected Eastern Cape medicinal plants http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:54560 Wed 10 Aug 2022 18:28:20 SAST ]]> The foraging ecology of female Cape fur seals (Arctocephalus pusillus pusillus) in South Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:54559 Wed 10 Aug 2022 17:47:17 SAST ]]> Synthesis and applications of novel fluorescent and colorimetric coumarin-based sensors towards analyte sensing in aqueous systems http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:54558 Wed 10 Aug 2022 16:59:25 SAST ]]> Zooplankton dynamics of Algoa Bay (South Africa) under varying oceanographic conditions http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:54554 50 y), global environmental datasets and innovative meta-analyses, building deep knowledge of regional bio-physical dynamics and responses to specific perturbed states remains an essential component of the collective effort. Algoa Bay, situated on the warmtemperate south-east coast of South Africa presents a unique opportunity to study key elements of plankton ecology relevant to climate change problems in the regional sense. The embayment is locally subjected to frequent wind-driven upwelling and regionally, to periodic mesoscale oceanographic forcing (e.g., large solitary meanders, Agulhas Current intrusions), all of which culminate in a complex physical and biogeochemical environment. Using zooplankton as the focal component and drawing from a multi-year monthly dataset incorporating a bay-scale sampling framework, the present study addressed three key hypotheses pertaining to 1) drivers of spatio-temporal variability, 2) biomass rate of change over temporal scales using time-series analyses, and 3) community responses to a bay-scale biological perturbation event. Zooplankton biomass exhibited prominent seasonal patterns with bimodal peaks corresponding with near-consistent year-to-year autumn and spring blooms. Overall, the spatial trend showed no heterogeneity, though statistical significance between-station variability was noted per season. An analytical framework involving generalised additive models revealed zooplankton spatial heterogeneity in Algoa Bay to be a function of seasonal variation in a suite of physicochemical variables, including the combined effects of temperature, salinity, dissolved oxygen, total nitrogen and silicate, but not ammonium, phosphate or chlorophyll-a (as proxy for phytoplankton). Fronts (including river plumes), warm water intrusion from the Agulhas Current, and wind-driven upwelling were postulated to be key driving forces. Structural breaks analysis performed on station-specific time series revealed significant incremental increases in zooplankton biomass over time, which in turn, corresponded with a gradual decrease in thermocline depth. The most pronounced increasing effect was associated with a period (2013– 14) of amplified land-derived nutrient input and increasing harmful algal bloom (HAB) activity.]]> Wed 10 Aug 2022 15:58:07 SAST ]]> Development of a crumb rubber adsorbent for the sorption of lead and copper from waste water: Optimization of sorption in a binary component system http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62356 Wed 08 Mar 2023 15:38:38 SAST ]]> Beauty from Ashes:short term postfire regeneration of dune fynbos -thicket vegetation in the South Eastern Cape floristic region http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62319 Wed 08 Mar 2023 15:17:05 SAST ]]> Beneficiation of pyrolysis-derived waste tyre char by blending with torrefied wood and microalgae to produce solid fuel http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:59241 Wed 08 Feb 2023 10:07:28 SAST ]]> Factors affecting pinniped skull morphology http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:70077 Tue 28 Nov 2023 15:39:17 SAST ]]> Costs and consequences at the population-environment-development interface in St Francis Bay: exploring the linkages of a complex system http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:70065 Tue 28 Nov 2023 14:51:55 SAST ]]> The effect of Cannabis extract on the morphological and metabolic characteristics of various fat depots in diet-induced Obese and STZ-induced male wistar rats http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:70044 Tue 28 Nov 2023 12:39:10 SAST ]]> A value alignment smart city stakeholder model http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:46309 Tue 24 May 2022 13:48:37 SAST ]]> An evolutionary algorithm approach to ecological optimal control problems http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:52812 Tue 23 May 2023 08:52:22 SAST ]]> Evaluation of the mesozooplankton functional diversity indices in Algoa Bay as proxies to assess the stability of the food chain leading to the African penguin (Spheniscus demersus) http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62698 Tue 21 Mar 2023 12:00:08 SAST ]]> The effect of limestone ammonium nitrate and chicken manure fertilizers on growth, yield and quality of two cabbage cultivators http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62695 Tue 21 Mar 2023 11:30:30 SAST ]]> An evaluation of hibiscus sabdariffa gold nanoparticles for the treatment of triple negative breast cancer http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62697 Tue 21 Mar 2023 11:21:50 SAST ]]> In vitro evaluation of vernonia amygdalina gold nanoparticles to stimulate apoptosis in breast cancer lines http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62696 Tue 21 Mar 2023 10:46:29 SAST ]]> Using information visualization to support the self-management of type 2 diabetes mellitus http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:53409 Tue 19 Jul 2022 23:32:36 SAST ]]> The potential impacts of hydraulic fracturing on Khoisan peoples’ sense of place: in the case of Karoo Region, South Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:53408 Tue 19 Jul 2022 22:59:52 SAST ]]> Mangrove response to water level changes at the Nxaxo-Ngqusi and St Lucia Estuaries http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:45689 Tue 19 Jul 2022 17:52:06 SAST ]]> Foraging behaviour of the Sooty Albatross in relation to climatic variability and fisheries http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:53383 Tue 19 Jul 2022 14:26:06 SAST ]]> An exploration of the Participatory Guarantee System (PGS) facilitating the growth and certification of small-scale organic farmers: Giyani, Garden Route and Overberg case studies http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:66574 Tue 15 Aug 2023 12:42:53 SAST ]]> Continuous flow synthesis of a key intermediate towards the antidiabetic drug repaglinide http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69715 Tue 14 Nov 2023 09:57:15 SAST ]]> Microstructural based creep life assessment of 1CrMov Turbine rotor steels after long-term service http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:70622 272 kh). The Fe/Cr and Fe/Mo ratios in overall carbides decreased from 5 and 10 (initial state) to 1 and 2 (>272 kh), respectively. The TKD analysis indicated that the relative phase proportion of M2C and M7C3 carbides, relative to the total extracted carbides, is positively correlated with service exposure. These microstructural features correlate with the creep life fraction consumed and could potentially be used as another indicator of the remnant creep life.]]> Tue 12 Dec 2023 15:05:41 SAST ]]> South African plantation forest nursery pesticide -use: current status, pesticide identification for management, and screening of fungicides for pathogen control http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:70618 Tue 12 Dec 2023 13:39:22 SAST ]]> Validation and adaptation of statistical models based on the SAPS III score to predict in-hospital mortality in a South African ICU http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:70602 Tue 12 Dec 2023 11:30:04 SAST ]]> Optimization of liposomes for enhanced stability against degradation by gastrointestinal fluid content http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:46305 Tue 08 Feb 2022 13:55:42 SAST ]]> Corrosion and hydrogen resistant modified zirlo surfaces for nuclear fuel cladding http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:46252 Tue 08 Feb 2022 11:52:42 SAST ]]> A 5G Communication system based on flexible spectrum technology for the SKA http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:56013 Tue 06 Sep 2022 14:34:13 SAST ]]> Phytochemical investigation and antidiabetic activity of cissampelos capensis and strychnos henningsii the Eastern Cape medicinal plants http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:55956 Tue 06 Sep 2022 12:08:04 SAST ]]> A spatial assessment of riparian vegetation density and implications for streambank erosion in relation to land tenure in the Mgwalana Catchment, Eastern Cape Province, South Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:46026 Tue 01 Feb 2022 13:06:45 SAST ]]> Engineering nanocatalysts using mixed metals for hydrodesulfurization of fuel oil http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:46021 RhMo-AA/Al2O3 (73%) > RhMo-CA/Al2O3 (72%) > RhMo-EDTA/Al2O3 (68%). This could be that the addition of chelating ligand complexed both metallic species retarding sulfidation of both metals, hence lowering the HDS activity. Studies show that it is possible for the citric acid to complex with both promoter and an active metal (Mo), and this might result in the formation of molybdenum dimers, trimers and tetramers which are difficult to sulfide. XPS analysis showed that unchelated catalyst have more MoS2 phases of 63%, hence higher dispersion than the chelated catalyst, this could be the reason for high activity in RhMo/Al2O3 (88%) catalyst.]]> Tue 01 Feb 2022 12:45:40 SAST ]]> Effect of coal and microalgae biomass co-firing on CO2, SO2 and NOx emissions: An experimental evaluation http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:45984 Tue 01 Feb 2022 12:10:53 SAST ]]> Factors influencing first-year students’ career decisions to pursue an IT career http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:46306 Thu 20 Oct 2022 12:38:48 SAST ]]> Ocean structures and dynamics of two open bays on the eastern Agulhas Bank http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:45680 Thu 20 Jan 2022 19:03:38 SAST ]]> Top-down control by grapsoid crabs in South African estuarine salt marshes http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69807 Thu 16 Nov 2023 15:07:51 SAST ]]> Use of flow reactors for an improved synthesis of Tenofovir derivatives http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69792 Thu 16 Nov 2023 11:42:23 SAST ]]> An investigation of alternative separation strategies for common chemical mixtures by means of host-guest chemistry protocols with host compounds N,N′- bis(5-phenyl-5-dibenzo[a,d]cycloheptenyl)ethylenediamine and N,N’-bis(5-phenyl-10,11- dihydro-5-dibenzo[a,d]cycloheptenyl)ethylenediamine http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69791 Thu 16 Nov 2023 10:59:47 SAST ]]> Fixed point theory in metric and normed Spaces http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62686 Thu 14 Mar 2024 14:59:00 SAST ]]> The quantification of Pinus patula recovery and productivity of manually orientated biomass collection in post mechanised full tree and semi mechanised tree length harvesting operations http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:70692 Thu 14 Dec 2023 11:51:39 SAST ]]> In-vitroevaluation of bridelia ferruginea extract gold nanoparticles for the treatment of colon cancer http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:46311 Thu 10 Feb 2022 18:49:33 SAST ]]> Applying a systems analysis approach to support marine spatial planning in Algoa Bay, South Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:46312 Thu 10 Feb 2022 11:07:35 SAST ]]> Spatial and temporal analysis of the critical zone in the Western rift valley corridor: towards earth stewardship science in East Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62423 130%. This assessment ultimately provides a platform for regional governance development at the basin scale and Earth Stewardship science in East Africa. These changes require transdisciplinary action from researchers to civil society. The AAC provides the foundation for understanding the dynamics of the systems that support life across broader spatial and temporal resolutions in Africa, highlighting the need for future generations to build socio-ecological resilience to anticipate challenges such as biodiversity loss posed by climate change and excessive land cover change.]]> Thu 09 Mar 2023 15:39:54 SAST ]]> The co-evolution of Africa’s eastern margin and its primate fauna: implications for hominin evolution http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62418 Thu 09 Mar 2023 15:18:58 SAST ]]> Effects of Lignin on the properties of reclaimed rubber /natural rubber blends http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62409 Thu 09 Mar 2023 14:37:01 SAST ]]> Potential suppressive effects of alien Acacia melanoxylon on Afrotemperate Forest tree recruitment http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:51989 Thu 09 Jun 2022 16:57:43 SAST ]]> Effect of fire severity on Afrotemperate forest tree survival http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:51988 40) individually, using logistic regression. A strong linear relationship between dNBR and stem fire severity (r2 = 0.69, p < 0.001) confirmed the accuracy of dNBR as a measure of fire severity in Afrotemperate forest. In the fire investigated, 4 628 ha of Afrotemperate forest burnt of which 67% burnt at low severity, 21% at medium severity and 12% at high severity. The dNBR values associated with fire severity categories were comparable between Afrotemperate and North American forests, suggesting that dNBR values are relatively standard across forest types. Information on the distribution of fire severity facilitates investigation of further questions regarding past and future fire regimes and the fire ecology of Afrotemperate forest. The post-fire survival rate of Afrotemperate forest trees was 45% which is comparable to that in coniferous forests of North America but lower than that in temperate forests of Australia and Portugal and the neighbouring dune thicket which shares several species with Afrotemperate forest. Fire severity had a significant negative effect on survival and tree size a significant positive effect. Total variance explained by the model (for species collectively) was 40.8%, of which fire severity and tree size combined explained 13.2%, and species as random factor, 27.6%. Respective tree species showed differential survival responses – four species showed high survival (> 60% of individuals), while five species showed low survival (< 40%). This study was the first post-fire assessment of the resprouting ability of Afrotemperate forest trees and a third of the trees surveyed (for species collectively) resprouted from the stem. This suggested that resprouting from the stem is a primary means of post-fire recovery in Afrotemperate forest trees, in contrast with previous assertions that several common canopy species, including Podocarpus latifolius, Afrocarpus falcatus, Scutia myrtina, Scolopia mundii and Rapanea melanophloeos, are unable to resprout. Varying resilience to fire among species supports previous suggestions that fire affects species’ composition and diversity in these forests and calls for careful management of fire regimes in the face of global change.]]> Thu 09 Jun 2022 16:02:39 SAST ]]> A data-driven decision-making model for the third-party logistics industry in Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:46022 Thu 03 Feb 2022 13:55:30 SAST ]]> Smart catchment management and application in the Swartkops River and Estuary http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:54401 Sat 06 Aug 2022 23:59:59 SAST ]]> Cape Vultures (Gyps coprotheres) and the threat of wind farms: a race to extinction? http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:54399 Sat 06 Aug 2022 22:47:34 SAST ]]> Impacts of algal blooms in a temperate Estuarine fish nursery area, South Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:54398 1000 cell m L-1 ) of H. akashiwo was present during all but the winter months in the poly- to mesohaline zone, yet it peaked in warmer spring/summer months with a density of ca. 70 000 cell m L-1 corresponding to 800 µg Chl-a L -1 . This species significantly altered the estuary's water quality, causing supersaturated surface- and hypoxic bottom-water during severe HABs or referred to as hypereutrophic bloom phases (> 60 µg Chl-a L -1 ). Despite these changes, the common copepod, Pseudodiaptomus hessei, occurred at similar densities among HAB phases and responded to similar triggers to the HAB. However, a shift in predator-prey interactions within the zooplankton community was evident, with scavenger or opportunist species such as the isopod, Cirolana fluviatilis, and the polychaete, Perinereis falsovariegata, occurring at higher densities during hypereutrophic bloom phases. The overall abundance of juvenile and small adult fishes were high during HABs, but the diversity decreased during HABs. Some species, notably the Mugilidae occurred at lower densities during HABs. Mugilidae also had pronounced histological gill alterations and a lowered proportion of secondary lamellae available for gas exchange during an in situ cage experiment where fishes were isolated inside and outside the HAB. Deformities such as tumorous growths were also found for the first time in a South African Estuary. This indicated a stressed population of Mugilidae in the Sundays Estuary. The ubiquitous mugilid, Mugil cephalus, actively avoided HABs during an acoustic telemetry study, despite having a home range that overlapped the HAB area. Tagged individuals mostly occupied areas directly above the HAB in the upper mesohaline to lower oligohaline zones and only iv briefly transitioned through the HAB area to utilise the lower reaches of the estuary. Since the formation of HABs is reliant on various factors, including specific species responses, environmental variables, nutrient enrichment, and flow characteristics, the impacts of HABs on estuarine communities may vary between estuarine systems or affected species. Therefore, more research that focuses on the impacts of HABs on estuaries is needed to limit the potential loss of ecosystem services. Particularly in light of further unsustainable development, upstream freshwater abstraction and climate change, will cause more frequent and severe HABs, that may result in fish population declines in the long-term. Better management and mitigation strategies are needed to reduce HAB formation such as reducing nutrient enrichment and restoring natural freshwater flow and flooding events to the Sundays Estuary.]]> Sat 06 Aug 2022 22:03:17 SAST ]]> A case study assessment of the ecological and social status of the South African boat-based whale watching industry http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:54397 Sat 06 Aug 2022 21:37:41 SAST ]]> Effect of fire severity on Afrotemperate forest tree survival http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:57635 40) individually, using logistic regression. A strong linear relationship between dNBR and stem fire severity (r2 = 0.69, p < 0.001) confirmed the accuracy of dNBR as a measure of fire severity in Afrotemperate forest. In the fire investigated, 4 628 ha of Afrotemperate forest burnt of which 67% burnt at low severity, 21% at medium severity and 12% at high severity. The dNBR values associated with fire severity categories were comparable between Afrotemperate and North American forests, suggesting that dNBR values are relatively standard across forest types. Information on the distribution of fire severity vi facilitates investigation of further questions regarding past and future fire regimes and the fire ecology of Afrotemperate forest. The post-fire survival rate of Afrotemperate forest trees was 45% which is comparable to that in coniferous forests of North America but lower than that in temperate forests of Australia and Portugal and the neighbouring dune thicket which shares several species with Afrotemperate forest. Fire severity had a significant negative effect on survival and tree size a significant positive effect. Total variance explained by the model (for species collectively) was 40.8%, of which fire severity and tree size combined explained 13.2%, and species as random factor, 27.6%. Respective tree species showed differential survival responses – four species showed high survival (> 60% of individuals), while five species showed low survival (< 40%). This study was the first post-fire assessment of the resprouting ability of Afrotemperate forest trees and a third of the trees surveyed (for species collectively) resprouted from the stem. This suggested that resprouting from the stem is a primary means of post-fire recovery in Afrotemperate forest trees, in contrast with previous assertions that several common canopy species, including Podocarpus latifolius, Afrocarpus falcatus, Scutia myrtina, Scolopia mundii and Rapanea melanophloeos, are unable to resprout. Varying resilience to fire among species supports previous suggestions that fire affects species’ composition and diversity in these forests and calls for careful management of fire regimes in the face of global change.]]> Mon 31 Oct 2022 14:43:48 SAST ]]> The Impact of socio-Economic and institutional factors on the Livelihoods of artisanal fisherfolk of Korsten, Gqeberha. http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:53334 Mon 18 Jul 2022 14:17:35 SAST ]]> Bootstrap-based tolerance intervals for nested two-way random effects models http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:53331 Mon 18 Jul 2022 13:27:35 SAST ]]> Assessing the Role of Women on Small-Scale Agribusiness at Wincanton Estate in Kariega, South Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69690 Mon 13 Nov 2023 12:55:18 SAST ]]> Evaluation of the toxicity of secondary metabolites in Solanum incanum L. to advance community knowledge http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69686 Mon 13 Nov 2023 12:10:26 SAST ]]> Hydraulic vulnerability of Subtropical Thicket to drought : a remote sensing and physiological perspective http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:52017 Mon 13 Jun 2022 12:24:52 SAST ]]> Developing a socio- ecological framework for the restoration of estuaries using the Swartkops Estuary as a case study http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62208 Mon 06 Mar 2023 13:24:05 SAST ]]> Uptake and storage of nutrients by primary producers in the Swartkops Estuary http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62195 Mon 06 Mar 2023 12:53:06 SAST ]]> Development of a continuous flow process towards the synthesis of fluvastatin: a lipid lowering drug http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62175 Mon 06 Mar 2023 11:52:55 SAST ]]> Characterising termite mound spatial patterns in the Eastern Cape Karoo : applying drone remote sensing,GIS and spatial statistics http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62169 Mon 06 Mar 2023 11:09:17 SAST ]]> Mesozooplankton and particle dynamics in Algoa Bay, South Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62157 100 µm) dynamics within the dynamic coastal ecosystem of Algoa Bay, located within warmtemperate South Africa, in spring 2020 and summer 2021. This study revealed seasonal shifts in mesozooplankton taxa succession from spring herbivorous/omnivorous, dominated by copepods, to summer omnivorous/carnivorous mesozooplankton, dominated by copepods, Noctiluca sp., Cladocera, doliolids, salps and siphonophores. The mesozooplankton integrated abundance (mean ± standard error) increased from spring to summer, with 101 ± 26 (min. – max.: 18 – 200) x 103 ind m¯ 2 and 422 ± 80 (min. – max.: 37 – 1056) x 103 ind m¯ 2 , respectively. In summer, mesozooplankton composition was affected by the passage of a Natal Pulse, identified from satellite-derived sea level anomaly data. This study also provided the first vertical profiles of copepod distributions and suspended particles in Algoa Bay, with a peak of small particle (< 1 mm ESD) biomass close to the bottom and often, but not systematically, higher copepod abundances above the thermocline. The results presented herein are expected to contribute to the understanding of the coastal pelagic ecosystem in Algoa Bay in response to environmental perturbations]]> Mon 06 Mar 2023 09:45:34 SAST ]]> Effect of livestock management and services to ecosystems on rangeland health and resilience in the NamaKaroo http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:66017 Fri 28 Jul 2023 14:58:10 SAST ]]> A critical exploration of the attitudes towards and knowledge of natural resource management amongst first-year Natural Resource Management students http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:45688 Fri 28 Jan 2022 11:06:50 SAST ]]> Coordination polymers for denitrogenation of fuel oils http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:45682 Fri 28 Jan 2022 09:32:18 SAST ]]> Microstructural characterization of Swift Heavy Ion (SHI) induced rotation in single crystal NiO http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:45685 Fri 28 Jan 2022 09:25:32 SAST ]]> Distinguishing elephant induced thicket degradation and climate related factors in Addo Elephant National Park, Eastern Cape, South Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:66741 Fri 25 Aug 2023 10:39:58 SAST ]]> A social media analytics framework for decision-making in citizen relationship management http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62815 Fri 24 Mar 2023 15:08:31 SAST ]]> Assessing diatom community composition and structure in palaeosediments of a southern Cape coastal wetland http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69847 Fri 17 Nov 2023 14:53:15 SAST ]]> Isolation, characterization and functionalization of cellulose fibres derived from the waste pineapple leaf fibres by hydrolysis to produce cellulose acetate http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69844 Fri 17 Nov 2023 14:19:01 SAST ]]> The influence of site characteristics on growth and wood properties of Pinus radiata and Pinus elliottii in the Southern and Eastern Cape forestry regions of South Africa http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69828 Fri 17 Nov 2023 13:20:56 SAST ]]> The design and synthesis of novel fluorescent coumarin-based derivatives as chemosensory for the application of toxic metal ion detection http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:69851 Fri 15 Mar 2024 12:52:01 SAST ]]> Synthesis of cannibigerol, an antibiotic for methycillin resistant staphylococcus aureus, in continuous flow system http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:54395 Fri 15 Mar 2024 12:10:52 SAST ]]> Cannabidiol: extraction and purification using flow Chemistry http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:53410 Fri 15 Mar 2024 12:05:51 SAST ]]> Modelling the dynamics of Breast Cancer disease with hormone therapy and surgery controls http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:70688 Fri 15 Mar 2024 12:04:38 SAST ]]> The development of a flow route to synthesize 3- benzyl-6-bromo-2-methoxyquinoline, an intermediate of an anti-TB drug, bedaquilin http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62455 Fri 10 Mar 2023 16:23:15 SAST ]]> Growth performance of three F1 Hybrid tomato (Solanum lycopersicum L.) Cultivars grown in Peat moss and Sawdust http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62450 Fri 10 Mar 2023 15:47:40 SAST ]]> Habitat use by Juvenile coastal fish in subtidal vegetated habitats of Algoa Bay;s shallow water seascape http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:62429 Fri 10 Mar 2023 11:31:22 SAST ]]> Spatial modelling of accessibility to tuberculosis treatment: the case of Ngaka Modiri Molema District http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:52000 Fri 10 Jun 2022 12:04:20 SAST ]]> Classification and clustering based methods for outlier detection of solar resource data http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:51996 Fri 10 Jun 2022 11:50:14 SAST ]]> Encapsulation of flame retardants for lithium-ion battery safety http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:51993 Fri 10 Jun 2022 10:33:13 SAST ]]>