https://commons.ru.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 https://commons.ru.ac.za/vital/access/manager/Repository/vital:41962 Wed 26 Oct 2022 16:01:49 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28235 Wed 15 Sep 2021 14:30:53 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28200 Wed 15 Sep 2021 12:17:59 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38577 Wed 12 Oct 2022 12:44:54 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30568 Wed 12 Oct 2022 12:01:14 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36591 Wed 12 Oct 2022 11:52:01 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28408 Wed 12 May 2021 23:41:05 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28148 Wed 12 May 2021 23:18:51 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26616 80 %) feeding, and morning courting behaviour for this species were confirmed. However, during the summer holiday period (mid-December to mid-January) few seahorses were observed on camera, which suggests that the increase in motor boat activity and the related increase in noise had a negative effect on H. capensis feeding and courting behaviour. The marina development, and in particular the Reno mattresses, created a new habitat for this endangered species within the Knysna estuary. In addition to the protection and restoration of natural habitats in which H. capensis is found, the conservation potential of artificial structures such as Reno mattresses should be realised.]]> Wed 12 May 2021 22:34:55 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30035 Wed 12 May 2021 22:23:52 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37937 Wed 12 May 2021 20:49:13 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28655 Wed 12 May 2021 20:20:21 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26623 Wed 12 May 2021 20:17:12 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28296 Wed 12 May 2021 20:04:41 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37810 Wed 12 May 2021 19:28:59 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:34273 Wed 12 May 2021 19:20:56 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:29873 Wed 12 May 2021 19:13:21 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28173 Wed 12 May 2021 19:03:16 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28535 Wed 12 May 2021 18:46:25 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38091 Wed 12 May 2021 18:26:49 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:34293 Wed 12 May 2021 17:42:00 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26607 Wed 12 May 2021 17:33:21 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37907 20-40mm), swimmers, flattened body shape, a preference for temporary attachment, crawling, respiration with aerial/vegetation, possession of breathing tubes, possession of strap or other apparatus for respiration, streamlined body, and a high sensitivity to oxygen depletion. Permanent attachment as an ecological preference associated with LIS was also positively correlated with increasing dissolved oxygen (DO) and was deemed a pollution sensitive ecological preference. The possession of very small body size (<5mm), associated with HIS, was deemed a pollution-tolerant trait and was negatively correlated with DO, confirming the deteriorating state of the urban and urban-agricultural rivers. The impact of urban-forestry pollution on the distribution pattern of macroinvertebrate traits and ecological preferences was also explored in the selected rivers. Traits and ecological preferences such as possession of hard-shell, large body size, and grazing as a feeding preference which were significantly positively associated with the LIS, were also either significantly positively correlated with DO, or significantly negatively correlated with increasing any two of flow velocity, water temperature, BOD5 and nutrient. These traits and ecological preferences were deemed sensitive in forested rivers receiving urban pollution. Further, burrowing, the pupa aquatic stage, and predation which were significantly positively associated with HIS on the RLQ ordination, were also significantly negatively associated with DO. These traits were deemed tolerant of forested systems receiving urban pollution. Multimetric indices (MMI) were developed, validated and applied for urban, urban-agriculture and urban-forested (MMI-urban, MMI-urban-agric and urban-forest) areas. Of the 26 metrics that satisfactorily discriminated between the LIS, the MIS, and the HIS for MMI-urban, only five metric were retained for integration into MMI-urban, they are log VeL, Hemiptera abundance, % Coleoptera + Hemiptera, % Chironomidae + Oligochaeta and Evenness index. Further, of the 18 metrics that satisfactorily discriminated between the LIS, the MIS, and the HIS for MMI-urban-agric, only 12 metrics were retained and nine proved to be redundant. The nine metrics represent different measures; two of them were retained in addition to Chironomidae/Diptera abundance, % Odonata and Oligochaeta richness. The two metrics selected in addition to the hironomidae/Diptera abundance, % Odonata and Oligochaeta richness were the Margalef index and the logarithm of relative abundance of sprawler. For the MMI-urban-forest, 14 metrics satisfactorily discriminated between the LIS, the MIS, and the HIS, and 12 metrics were retained and 11 proved to be redundant. The non-redundant metric was Trichoptera abundance. Three metrics were further selected in addition to the Trichoptera abundance which include % Chironomidae + Oligochaeta, Coleoptera + Hemiptera richness and Shannon diversity. The MMI-urban and MMI-urban-agric indices performed better for LIS designated stations compared to the MIS and HIS deignated stations. The developed indices proved effective as biomonitoring tools for assessing the ecological health of rivers in the urban and urban-agriculture catchments within the Niger Delta. Overall, the results of the macroinvertebrate traits and ecological preferences, and taxonomic approaches showed the strength in the complementarity of both approaches in developing biomonitoring tools for assessing levels of deterioration in riverine systems. The study contributes significantly to understanding the ecology of riverine systems in the Niger Delta, particularly those subject to urban stresses, agricultural activities and urban pollution in forested systems, and thus makes an important contribution to the science and practice of biomonitoring in Nigeria where such studies are sparse.]]> Wed 12 May 2021 17:31:44 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28222 Wed 12 May 2021 17:20:34 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38177 Wed 12 May 2021 16:20:35 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:21281 Wed 12 May 2021 16:15:31 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38447 Wed 12 May 2021 16:10:18 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26564 1 (indicating autochthony). In addition to the tracer and FFG analyses for examining trophic connections between land and river, the bidirectional exchange of organisms between the riparian zone and the river was assessed using floating pyramidal traps (to measure emergence) and pan traps (for infalling invertebrates) placed at different sites in the river and the biomass in each trap was determined. The exchanges were variable over space and time, with emergence peaking in summer (169 to 1402 mg m-2 day-1) and declining in winter (3 to 28 mg m-2 day-1). Similarly, infalling invertebrates increased in summer (413 to 679 mg m-2 day-1) and declined in winter (11 to 220 mg m-2 day-1). Biomass measurements are indications of quantity that ignore nutritional quality, so I determined the bidirectional flow of invertebrates using absolute concentrations of physiologically important biochemical compounds (essential and polyunsaturated fatty acids). The fluxes of emergent and infalling arthropods peaked in summer (emergence = 0.3 to 18 mg m-2 day-1 and terrestrial infall = 0.3 to 3 mg m-2 day-1) and declined in winter (emergence = 0.01 to 0.51 mg m-2 day-1 and terrestrial infall = 0.01 to 0.03 mg m-2 day-1). However, during some seasons, no significant differences in polyunsaturated fatty acid flux in either direction were observed; this finding indicated the balance of reciprocal subsidisation via reciprocal flows of animals. Factors such as air temperature and algal productivity affected the reciprocal flows between adjacent habitats, with algal productivity being positively related to emergence while air temperature was positively correlated to infalling terrestrial invertebrates. This research enhances the growing body of literature on the function of riverine systems and offers some invaluable information on the flow of energy and the role played by invertebrates in translocating nutrients from terrestrial systems to aquatic systems and vice versa. This study unifies the concepts of the RCC and RPM and shows that these concepts are not limited only to large rivers, but are applicable to small southern temperate rivers too. However, some tenets of the theoretical models were challenged. For example, it challenges the proposition by the RCC that the fine particulate organic matter leaked from upstream breakdown of coarse particulate organic matter is predominantly allochthonous. Additionally, this study showed that in the headwaters, the RPM underestimated the role of autochthony. Overall, the results showed that the Kowie River and its riparian area are intrinsically connected. Once we understand the mechanisms controlling connections and subsidies across ecotones, we can then start to predict the consequences of disruptions to these connections by climate change and/or land use changes. To make predictions about future perturbations to rivers and riparian zones, studies like this, which considers the form and magnitude of subsidies, are needed to provide baseline information. Algal resources (e.g. epiphyton), macrophytes, riparian plants, terrestrial organisms and aquatic organisms all contributed to aquatic and terrestrial linkages in the Kowie River; therefore, it is important to conserve the different components of these ecosystems.]]> Wed 12 May 2021 16:03:58 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30997 Wed 12 May 2021 15:43:54 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41336 Wed 12 May 2021 15:11:47 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41337 Wed 12 May 2021 15:02:23 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41920 Wed 12 May 2021 15:01:32 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:40963 Wed 12 May 2021 14:58:07 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41296 Wed 12 May 2021 14:52:01 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41469 Wed 12 May 2021 14:51:15 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:42477 Wed 12 May 2021 14:48:51 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41437 Wed 12 May 2021 14:45:54 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41164 Wed 12 May 2021 14:30:41 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:42052 Wed 12 May 2021 14:30:41 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41506 Wed 12 May 2021 14:11:40 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:42172 Wed 12 May 2021 13:59:27 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28139 Wed 03 May 2023 14:17:38 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28061 Tue 15 Aug 2023 11:05:18 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:29124 Tue 11 Jul 2023 16:25:27 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30599 Thu 29 Sep 2022 14:23:25 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:42759 10 m depth) and inshore sites (intertidal surf zones). Many sites in the bay, especially the atypical site at Cape Recife, exhibit higher than the average pH levels (>8.04), suggesting that pH variability may be biologically driven. This is further evidenced by high diurnal variability in pH (~0.55 pH units). Although the specific drivers of the high pH variability in Algoa Bay could not be identified, baseline carbonate chemistry conditions were identified, which is necessary information to design and interpret biological experiments. Long-term, continuous monitoring is required to improve understanding of the drivers of pH variability in understudied coastal regions, like Algoa Bay. A local fisheries species, D. capensis, was selected as a model species to assess the impacts of future OA scenarios in Algoa Bay. It was hypothesized that this temperate, coastally distributed species would be adapted to naturally variable pH conditions and thus show some tolerance to low pH, considering that they are exposed to minimum pH levels of 7.77 and fluctuations of up to 0.55 pH units. Laboratory perturbation experiments were used to expose early postflexion stage of D. capensis to a range of pH treatments that were selected based on the measured local variability (~8.0–7.7 pH), as well as future projected OA scenarios (7.6–7.2 pH). Physiological responses were estimated using intermittent flow respirometry by quantifying routine and active metabolic rates as well as relative aerobic scope at each pH treatment. The behavioural responses of the larvae were also assessed at each pH treatment, as activity levels, by measuring swimming distance and speed in video-recording experiments, as well as feeding rates. D. capensis had sufficient physiological capacity to maintain metabolic performance at pH levels as low as 7.27, as evidenced by no changes in any of the measured metabolic rates (routine metabolic rate, active metabolic rate, and relative aerobic scope) after exposure to the range of pH treatments (8.02–7.27). Feeding rates of D. capensis were similarly unaffected by pH treatment. However, it appears that subtle increases in activity level (measured by swimming distance and swimming speed experiments) occur with a decrease in pH. These changes in activity level were a consequence of a change in behaviour rather than metabolic constraints. This study concludes, however, that based on the parameters measured, there is no evidence for survival or fitness related consequences of near future OA on D. capensis. OA research is still in its infancy in South Africa, and the potential impacts of OA to local marine resources has not yet been considered in local policy and resource management strategies. Integrating field monitoring and laboratory perturbation experiments is emerging as best practice in OA research. This is the first known study on the temperate south coast of South Africa to quantify local pH variability and to use this information to evaluate the biological response of a local species using relevant local OA scenarios as treatment levels for current and near future conditions. Research on local conditions in situ and the potential impacts of future OA scenarios on socio-economically valuable species, following the model developed in this study, is necessary to provide national policy makers with relevant scientific data to inform climate change management policies for local resources.]]> Thu 29 Sep 2022 12:42:34 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28410 Thu 25 May 2023 15:03:12 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28208 Thu 18 May 2023 15:27:00 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28707 Thu 13 May 2021 16:40:45 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38509 Thu 13 May 2021 15:55:13 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30711 Thu 13 May 2021 15:04:39 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30709 150% intensity) were old gravity schemes. Farmers on approximately 75% of Limpopo smallholder schemes are currently engaging in land exchange transactions in a highly insecure and un-formalised institutional setup. Land exchange prevalence longer than two years was moderately associated with cropping intensity and strongly associated with commercialisation. This result has three important implications. First, it suggests that more land is utilised on the schemes when there is vibrant land-leasing activity. Secondly, schemes with a higher prevalence of long-term leasing seem to have a strong tendency to be more commercialised. Thirdly, the duration of the lease is significant, as neither single-season, nor annual leases yielded any positive associations, while those exchanges that were two years or longer, were associated with increased performance. These findings highlight the potential for longer-term land-exchange interventions to address the widespread low land utilisation on smallholder schemes, and to catalyse more commercially-oriented farming. An irrigation scheme typology was derived from the cluster analysis and was aligned to a contemporary irrigation farming typology. The key descriptors included technology type, purpose of farming and scheme management type. By matching scheme type to the farmer typology (or typologies), strategic decisions regarding technology choices for infrastructure, land, and water institutional interventions can be better informed. All schemes demand attention to the multiple factors required to achieve performance, not least water-tenure security, irrigation management organisational development, and infrastructure modernisation. Complexity was demonstrated by the finding that multiple factors contribute to success, and that there are many dimensions that change independently and have a cascading effect through the system in ways that are difficult to predict. Agricultural systems support to achieve productivity and profitability are essential for success. The research findings lead to the recommendation that, in addition, strategic planners must also consider the implications of the dominant factors of water-technology choices so that these are manageable, and the dynamics of farm-size change based on land exchange processes, in order to harness new opportunities to maximise irrigation scheme performance in future.]]> Thu 13 May 2021 11:26:49 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37667 Thu 13 May 2021 10:59:19 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26580 99 % in selectively extracting the metalloporphyrins. The impact of the template on the affinity of recognition for NTPP was evaluated. The results showed that the NTPP adsorption capacity increased as the molar ratio of NTPP to styrene was increased from 1:1 to 3:1. The optimal ratio of template to functional monomer which yielded the best specific affinity and highest recovery (99.9 %) was 3:1. The effects of trifluoroacetic acid (TFA), dichloromethane (DCM), dimethyl sulphoxide (DMSO), pentane (PEN) on electro-spinnability of the polymer solutions and the morphological appearance of the nanofibers were investigated. The imprinted nanofibers exhibited the same selectivity specialism for both NTPP and VTPP. A remarkable stability in relation to reusability was observed when imprinted nanofibers were used, as they could be reused nine times without incurring any significant loss in removal efficiency. The results were validated by analysing a certified reference material. The imprinted sorbents were therefore found to be selective sorbents that are well suited for handling trace metals in organic media.]]> Thu 13 May 2021 09:54:20 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:33249 Thu 13 May 2021 07:39:35 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28540 Thu 13 May 2021 07:35:41 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:29380 20% habitat loss due to invasion). Upstream invasion by centrarchids isolated and fragmented P. afer populations into headwater refugia, while top down invasion by salmonids excluded B. trevelyani from invaded, more pristine stream reaches, by forcing the species into degraded unsuitable lower stream reaches. Predation also disrupted population processes such as adult dispersal for P. afer, and centrarchid-invaded zones acted as demographic sinks, where adults dispersing through invaded reaches were rapidly depleted. While the Mandela lineage of P. afer exhibited little within or between drainage genetic structuring, B. trevelyani was >4% divergent between drainages, and up to 2% divergent between streams within the Keiskamma River system (Chapter 7). The distribution of genetic diversity for B. trevelyani also indicated that the loss of diversity was imminent without immediate conservation interventions. This thesis has provided conclusive evidence that native fishes are vulnerable to invasion and that non-native predatory fishes have significant impacts on native fishes in Eastern Cape headwater streams. If management and conservation measures are implemented, the unwanted introduction and spread of non-native fishes may be restricted, allowing native fishes opportunities for recovery.]]> Thu 13 May 2021 07:28:56 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26387 Thu 13 May 2021 07:27:02 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:34282 Thu 13 May 2021 07:18:46 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:34163 Thu 13 May 2021 06:59:15 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28644 Thu 13 May 2021 06:58:27 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28089 Thu 13 May 2021 06:56:43 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:34478 Thu 13 May 2021 06:50:15 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:34081 Thu 13 May 2021 06:38:10 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38211 Thu 13 May 2021 06:15:33 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28227 Thu 13 May 2021 06:06:37 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:34035 Thu 13 May 2021 05:52:57 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28020 Thu 13 May 2021 05:35:32 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28067 Thu 13 May 2021 05:31:56 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:27820 Thu 13 May 2021 04:39:10 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28641 Thu 13 May 2021 04:24:57 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30936 Thu 13 May 2021 04:03:21 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26740 Thu 13 May 2021 04:01:16 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28608 Thu 13 May 2021 03:49:57 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:29790 Thu 13 May 2021 03:46:18 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28407 Thu 13 May 2021 03:42:47 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30946 Thu 13 May 2021 03:38:01 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26583 Thu 13 May 2021 03:30:11 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26588 Thu 13 May 2021 03:30:04 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30700 Thu 13 May 2021 03:23:30 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:21289 Thu 13 May 2021 03:07:02 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:35424 Thu 13 May 2021 02:53:44 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28154 Thu 13 May 2021 02:39:01 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:29860 Thu 13 May 2021 02:37:59 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:34291 Thu 13 May 2021 02:24:07 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:32315 Thu 13 May 2021 02:16:00 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30033 Thu 13 May 2021 01:51:14 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26565 Thu 13 May 2021 01:45:19 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:39051 Thu 13 May 2021 01:36:45 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38100 Thu 13 May 2021 01:12:05 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26875 Thu 13 May 2021 01:03:59 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28307 Thu 11 Apr 2024 19:25:38 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26877 Thu 01 Jun 2023 11:15:19 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28596 Thu 01 Feb 2024 09:56:38 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:27442 Thu 01 Feb 2024 09:48:57 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28065 Mon 05 Jun 2023 15:41:21 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28141 Fri 23 Jul 2021 12:25:01 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28228 Fri 17 Sep 2021 14:51:46 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28043 Fri 17 Sep 2021 11:42:47 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:26897 Fri 06 Aug 2021 09:57:38 SAST ]]>