Relevant bibliographies by topics / Olifants river (South Africa)

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Academic literature on the topic 'Olifants river (South Africa)'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Olifants river (South Africa)"

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Heritage, G., S. Tooth, N. Entwistle, and D. Milan. "Long-term flood controls on semi-arid river form: evidence from the Sabie and Olifants rivers, eastern South Africa." Proceedings of the International Association of Hydrological Sciences 367 (March 3, 2015): 141–46. http://dx.doi.org/10.5194/piahs-367-141-2015.

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Abstract. Rivers in the Kruger National Park, eastern South Africa, are characterised by bedrock-influenced "macrochannels" containing variable alluvial thicknesses and riparian vegetation assemblages. Evidence from the Sabie and Olifants rivers suggests that flows up to moderate floods (<3500 m3 s−1) tend to result in net alluviation, with sediments gradually covering the underlying bedrock. More extreme floods strip alluvium and erode bedrock, effectively exerting the primary control over long-term river morphologic development. On the Olifants River, post-flood aerial LIDAR imagery reveals that the 2012 extreme flood (~14000 m3 s−1) resulted in extensive stripping of stored alluvial sediment, exposing and eroding the underlying weathered bedrock. On the Sabie River, preliminary optically stimulated luminescence ages for remnant alluvium are all less than 1000 years, highlighting typical timescales of sediment storage. Together, these results suggest that while periods of general alluviation occur on these systems, long-term river development results from extreme flood-generated bedrock erosion.
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Prasad, Krishna C., Kenneth M. Strzepek, and Barbara van Koppen. "An approach to assessing socioeconomic implications of water management alternatives." Water Policy 9, no. 2 (2007): 131–47. http://dx.doi.org/10.2166/wp.2007.005.

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Socioeconomic development objectives are integral to the integrated river basin management initiatives in several river basins around the world, including the Olifants River Basin of South Africa. All viable strategic water management alternatives are expected to contribute towards such, usually predefined, socioeconomic objectives in addition to other hydrological and ecological objectives. An assessment of the relative merits of different alternatives becomes imperative to trace the respective contributions of the alternatives to such objectives and thus to identify the best-bet and most agreeable alternative from a multi-stakeholders' perspective. This paper reports key findings from application of a methodology for this purpose in the Olifants River Basin of South Africa by (a) establishing a link between water management indicators and socioeconomic objectives, (b) assessing the potential socioeconomic implications of various water management alternatives and (c) rank ordering the identified alternatives against the socioeconomic objectives based on multi-criteria decision analysis techniques.
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Prasad, Krishna C., Barbara van Koppen, and Kenneth Strzepek. "Equity and productivity assessments in the Olifants River basin, South Africa." Natural Resources Forum 30, no. 1 (2006): 63–75. http://dx.doi.org/10.1111/j.1477-8947.2006.00158.x.

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DE MOOR, FERDINAND C. "A survey of Trichoptera from the Tributaries of the Doring and mainstream Olifants Rivers, Cedarberg, South Africa with implications for conservation." Zoosymposia 5, no. 1 (2011): 350–59. http://dx.doi.org/10.11646/zoosymposia.5.1.27.

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The tributaries of the Olifants River draining the Cedarberg Mountains in the Western Cape are well known for their diverse fauna of endemic freshwater fish. Aquatic ecosystems in the region have also been identified as being particularly important in terms of ecosystem conservation. Recent surveys of aquatic macroinvertebrates have indicated that the region is rich in Trichoptera, with a number of regional endemic species, some of which are not recognizable as known described species. The distribution of certain species appears to be confined to either the arid east-flowing tributaries of the Doring River or else the wetter west-flowing tributaries of the mainstream Olifants River.
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Rowan, Andrew, and Les Thomson. "Olifants River Bridge Widening." MATEC Web of Conferences 199 (2018): 10007. http://dx.doi.org/10.1051/matecconf/201819910007.

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The Olifants River Bridge B3611 carries the N11 over the Olifants River, just North of the Loskop Dam. This structure was originally built in 1979 and was recently widened as part of the South African Roads Agency Limited (SANRAL)’s upgrade to the N11. At the time of design, very little was known about the bridge as no ‘As Built' drawings were available. Due to the remote locality of the structure, exploratory investigations were reserved until the construction phase. The final design solution was therefore amended during the construction phase in order to account for the reinforcement found within the structure. In addition to the heavier dead weight of the new widened deck, the bridge would be required to carry higher loads under modern loading codes. Widening works included new widened cantilevers with new reinforced concrete balustrades, tying into existing reinforcement. Strengthening for bending was provided to the main deck beams by means of longitudinal FRP plates epoxied to the soffit. Transverse pierhead strengthening using DYWIDAG bars was installed to counter increased moments, and pier strengthening using a reinforced concrete jacket was implemented to strengthen the piers. Durability concrete was specified in accordance with current SANRAL regulations and the durability performance of the concrete, even in this remote location was excellent. This paper summarises the work that was completed as part of this project.
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Marr, SM, TD Mohlala, and A. Swemmer. "The ecological integrity of the Lower Olifants River, Limpopo province, South Africa: 2009–2015 – Part A: Olifants River main stem." African Journal of Aquatic Science 42, no. 2 (2017): 171–79. http://dx.doi.org/10.2989/16085914.2017.1334501.

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McCartney, Matthew, and Roberto Arranz. "Evaluation of water demand Scenarios for the Olifants River catchment, South Africa." International Journal of River Basin Management 7, no. 4 (2009): 379–90. http://dx.doi.org/10.1080/15715124.2009.9635396.

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Selebalo, Itumeleng M., Mary C. Scholes, and Jai K. Clifford-Holmes. "A Systemic Analysis of the Environmental Impacts of Gold Mining within the Blyde River Catchment, a Strategic Water Area of South Africa." Water 13, no. 3 (2021): 301. http://dx.doi.org/10.3390/w13030301.

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Exploratory modelling of the impact of gold mining on groundwater in a strategic water area of South Africa was undertaken. A systems dynamics (SD) model was developed to simulate the impact of gold mining on water quality, focusing on groundwater contamination risk, within the context of competing developmental priorities around water resource development and the socio-economic gains from gold mining. The model also identified interventions to minimise the impacts by the year 2040. The study area was the Blyde River Catchment (BRC), which is part of the Olifants Water Management Area in South Africa. This area is an important contributor, currently and in the future, to freshwater flows and groundwater in the Olifants River Catchment, which is one of South Africa’s most economically important catchments. The model development process included a causal loop diagram­–based problem conceptualisation, followed by the drawing of stock-flow diagrams and the determining of model parameters based on a combination of background literature, data from environmental impact assessments, and from the national Department of Water and Sanitation. The model showed the potential environmental risks of gold mine wastewater production and interventions to minimise these risks. The most effective intervention identified to reduce the risk of groundwater contamination was the development and use of synthetic-lined tailings dams. The baseline simulation result of sulphate loading of 5430 t/year can be reduced by 3070 t/year to give a simulated sulphate load of 2270 t/year in 2040 using this intervention. In comparison, the simulated wastewater recycling intervention only reduced the sulphate load to 4630 t/year and the wastewater treatment interventions to 3420 t/year. This project contributes to the exploratory modelling of an understudied region of the Olifants River Catchment that is a crucial provider of freshwater flows to the Olifants, which is threatened by increasing gold mining in the upper BRC. The SD model highlighted the importance of protecting the dolomitic aquifers in the BRC for the long term sustainability of the catchment, which is particularly important if groundwater development occurs.
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Marr, SM, TD Mohlala, and A. Swemmer. "The ecological integrity of the lower Olifants River, Limpopo province, South Africa: 2009–2015 – Part B: Tributaries of the Olifants River." African Journal of Aquatic Science 42, no. 2 (2017): 181–90. http://dx.doi.org/10.2989/16085914.2017.1353477.

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Rasifudi, L., A. Addo-Bediako, K. Bal, and T. M. Swemmer. "Distribution of Benthic Macroinvertebrates in the Selati River of the Olifants River System, South Africa." African Entomology 26, no. 2 (2018): 398–406. http://dx.doi.org/10.4001/003.026.0398.

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Dissertations / Theses on the topic "Olifants river (South Africa)"

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Mthombeni, Vusi Gedla. "The biology of austroglanis gilli and austroglanis barnardi (siluriformes : austroglanididae) in the Olifants River system, South Africa." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1015222.

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Austroglanis gilli and A. barnardi are endemic to the Clanwilliam-Olifants System in the Western Cape, South Africa. The populations of each of these species are considered to be threatened by various anthropogenic activities, which include inappropriate agricultural practice and impacts of alien invasive fish species. The purpose of this thesis was to assess the life-history of these two endangered species in order to contribute to understanding their biology. Such information is vital for the development of strategies for their conservation. Marginal zone and marginal increment analyses from sectioned lapilliar otoliths of both A. gilli and A. barnardi showed a unimodal peak, suggesting a single annulus formation. The oldest specimens of A. gilli and A. barnardi were 12+ and 14+ years, respectively. The growth of A. gilli and A. barnardi was relatively slow and was best described by the von Bertalanffy growth curve as: L, = 131.56(1 - exp(- 0.27(t - 1.18 ))) for male and L, = 113.86(1 - exp(- 0.43(1- 0.74))) for female A. gilli from the Rondegat River. In the Noordhoeks River, growth was L, = 99.67(1 - exp(- 0.53(t - 0.35))) for male and L, = 96.60(1 - exp(- 0.64(t - 0.11 ))) for female A. gilli, and L, =71.02(1-exp(-0.26(1-3.07))) and L, = 69.50(1-exp(-0.36(1 - 1.88))) for male and female A. barnardi, respectively. The average natural mortality for the combined sexes was estimated using catch curve analysis at 0.37 ± 0.12 per year for A. gilli from the Rondegat River, and at 0.71 ± 0.05 and 0.39 ± 0.04 per year for A. gilli and A. barnardi from the Noordhoeks River, respectively. For A. gilli in the Rondegat River, the first maturity was estimated at 3.3 years (97.3 mm SL) for males and 3.1 years (94.3 mm SL) for females. In the Noordhoeks River, the first maturity for A. gilli was estimated at 2.0 years (71.9 mm SL) for males and 1.7 (66.4 mm SL) for females, and for A. barnardi at 2.0 (55.0 nun SL) for males and 2.9 years (58.9 mm SL) for females. Maturity corresponded closely to the asymptotic sizes from the von Bertalanffy curves, suggesting a shift in energy use from somatic growth to gonad development. Macroscopic assessment of the state of gonads, the Ganado-somatic index and histological examinations revealed that both A. gilli and A. barnardi have a single spawning season. The presence of oocytes in different stages of development in each of the ovaries of mature females collected between November and January suggested asynchronous, iteroperous serial spawning. The resorption of yolk was observed from ovaries collected between February and March and no vitellogenic oocyte was visible from ovaries collected between April and August. A similar trend was observed for males, with spermatozoa filling the lumen between November and January and some residual spermatozoa being present in the lumens soon after the breeding season. Spermatocytes and spermatids were dominant in the testes until October. An Index of Relative Importance revealed that A. gilli feeds predominantly on the benthic macroinvertebrate larvae of Ephemeroptera (particularly Baetidae), Diptera (particularly Chironomidae and Simuliidae) and Trichoptera. Austroglanis barnardi feeds predominantly on dipteran larvae (particularly Chironornidae and Simuliidae). Chi square contingency tables showed a significant difference in the dominant prey items of A. gilli and A. barnardi in the Noordhoeks River (X₂= 53.79, d.f. = 4, p > 0.001) and A. gilli between Rondegat and Noordhoeks rivers (x₂ = 34.74, d.f. = 4, p > 0.001). The Spearman's rank correlation test showed no shifts in the diet of A. barnardi from Noordhoeks River and A. gilli from Rondegat River with a change in size and season (p>O.OS). However, there was a shift in the diet of A. gilli from the Noordhoeks River which could suggest a distinct patchiness of benthic macroinvertebrates between the riffle feeding areas used by juveniles and other biotopes used by adults. The occurrence, in stomach contents, of other prey items from a wide variety of taxa and the presence of allochthonous material from the terrestrial environment could suggest an opportunistic feeding guild for both Austroglanis species. The life-history traits of A. gilli and A. barnardi, which are charaterized by slow growth, long life span and low relative fecundity, indicate that both species are relatively precocial and K-selected. The population of a precocial species is relatively stable and if population numbers were to be greatly reduced, they would require a long time to rebuild. An urgent conservation intervention is therefore recommended for Austroglanis spp. so as to maintain the diversity of populations within these species. The creation of protected river reserves and raising public conservation awareness may minimise activities that result in altered river hydrology and the destruction of complex benthic habitats.
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Horwood, Owen. "The Challenge of Change : A Study of Water Governance in the Olifants River Basin, South Africa." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517161.

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Swartz, Ernst Roelof. "Population genetics of Pseudobarbus phlegethon, Barbus calidus and Barbus erubescens (Teleostei: Cyprinidae) of the Olifants River System, Western Cape Province." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51876.

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Thesis (MSc)--University of Stellenbosch, 2000.<br>ENGLISH ABSTRACT: Endemic redfin minnows of the Olifants River System are under threat of extinction, mainly because of alien predatory fish, water extraction and pollution. The taxonomic position and biogeography of redfins in relation to other barbs are uncertain. Enzyme electrophoresis was employed to assess genetic differentiation within and among certain Barbus and Pseudobarbus taxa. Fourteen enzymes were routinely recorded from muscle tissue extracts, yielding a differential number of active loci. The latter is due to different ploidy levels. Polyploid species showed fewer loci than the tetraploid or hexaploid number of loci expected just after the polyploidy event. Barbus aenus (hexaploid) expressed 6.2 % of the duplicated loci expected after the hexaploidy event. The tetraploid Pseudobarbus and serrated Barbus spp., expressed 37.5 % and 31.2 % of the duplicated loci expected after the tetraploidy event, respectively. This suggests that the ploidy event in Barbus aenus is more ancient than in the above-mentioned tetraploid barbs. The similar amount of diploidization in Pseudobarbus and tetraploid serrated Barbus spp. investigated, suggests a shared ploidy event between these two lineages. The number of active loci is apparently not a good indication of the ploidy level of African barbs, as hexaploid Barbus aenus expressed less active loci than the tetraploid barbs investigated. Initial screening of allozyme loci yielded fixed allele differences at 22 loci, but polymorphism only at seven. This suggests more potential for delineating species boundaries than for assessing gene flow and genetic diversity of populations. Genetic differentiation within and among populations of Pseudobarbus phlegethon, Barbus calidus and Barbus erubescens were investigated by screening 27 allozyme loci. A clear divergence between Pseudobarbus phlegethon populations from the Olifants and Doring Rivers was found (Nei's unbiased genetic distance = 0.355; F-statistic for subpopulation against the total = 0.877). Preference and adaptation for mountain stream habitat might explain the past isolation and subsequent divergence of Pseudobarbus phlegethon populations between these two rivers. Barbus calidus was genetically homogenous over its distribution (Nei's unbiased genetic distance = 0-0.009; F-statistic for subpopulation against the total = 0.135). It is proposed that Barbus calidus is better adapted than Pseudobarbus phlegethon to disperse through the main stream. The genetic divergence between Barbus calidus and Barbus erubescens (Nei's unbiased genetic distance = 0.063) is characteristic of conspecific populations. There seems to have been a loss of genetic diversity in redfin populations of the Doring River tributaries (heterozygosity = 0-0.01), compared to the redfin populations of the Olifants River tributaries (heterozygosity = 0.01- 0.04). From phylogenetic analysis ofallozyme characters, it seems as if the serrated tetraploid barbs from South Africa is the sister-group of Pseudobarbus, whilst Barbus anoplus was rejected as a sister-species for the latter. Barbus calidus, Barbus erubescens and Barbus serra were found to be closely related to each other. The ancestor of the redfins seems to have been present in the Cape Fold Mountains since at least the late- Tertiary. On the basis of distributional and allozyme information, conservation units reflecting historical divergence, historical gene flow and current gene flow were identified as Evolutionarily Significant Units, Historical Management Units and Current Management Units respectively. The Olifants and Doring River populations of Pseudobarbus phlegethon should be recognized as two distinct Evolutionarily Significant Units. Barbus calidus forms a separate Evolutionarily Significant Unit from Barbus erubescens. Twelve Historical Management Units and nineteen Current Management Units were recognized for redfins of the Olifants River System. The size of Current Management Units should be expanded and secured to prevent loss of genetic diversity. It is recommended that a recovery program of redfins should establish new populations of at least Barbus erubescens and Doring River Pseudobarbus phlegethon Evolutionarily Significant Unit. Centrarchids should be irradicated, as they are the main reason for the decline of red fins.<br>AFRIKAANSE OPSOMMING: Die endemiese rooivlerkies van die Olifantsriviersisteem word bedreig deur uitsterwing, hoofsaaklik as gevolg van uitheemse roofvisse, water onttrekking en besoedeling. Die taksonomiese posisie en biogeografie van rooivlerkies in verhouding met ander barbusse is onseker. Ensiemelektroferese is gebruik om genetiese differensiasie binne en tussen sekere Barbus en Pseudobarbus taksa te bepaal. Veertien ensieme, wat verskillende hoeveelhede aktiewe lokusse gelewer het, is op roetine basis waargeneem uit spierweefselekstrakte. Die verskillende hoeveelhede aktiewe lokusse wat waargeneem is, is as gevolg van verskillende ploied vlakke. Poliploïede spesies het minder lokusse getoon as wat verwag sou word net na die tetraploïede ofheksaploïede gebeurtenisse. Barbus aenus (heksaploïed) het 6.2% van die gedupliseerde lokusse, wat verwag sou word na die heksaploiede gebeurtenis, uitgedruk. Die tetraploïede Pseudobarbus en saagagtige Barbus spp. het 37.5% en 3l.2% respektiewelik van die gedupliseerde lokusse, wat verwag sou word na die tetraploïede gebeurtenis, uitgedruk. Dit dui daarop dat die ploïede gebeurtenis in Barbus aenus meer histories as in die bogenoemde tetraploïede barbusse. Die soortgelyke hoeveelheid diploïedisasie in Pseudobarbus en tetraploïede saagagtige Barbus spp. wat ondersoek is, dui op 'n moontlike gesamentlike ploïede gebeurtenis tussen hierdie twee evolusionêre lyne. Die aantal aktiewe lokusse blyk nie 'n goeie aanduiding van die ploïed vlakke van Afrika barbusse te wees nie, aangesien die heksaploïede Barbus aenus minder lokusse as die tetraploïede barbusse wat ondersoek is, getoon het. Aanvanklike analisering van allosiem lokusse het vaste alleel verskille in 22 lokusse opgelewer, maar slegs sewe het polimorfisme getoon. Dit dui op moontlike beter potensiaalom spesie-grense vas te stel, eerder as die bepaling van genevloei of genetiese diversiteit van populasies. Genetiese differensiasie binne en tussen populasies van Pseudobarbus phlegethon, Barbus calidus en Barbus erubescens is ondersoek deur 27 allosiem lokusse te analiseer. 'n Duidelike divergensie tussen Pseudobarbus phlegethon populasies van die Olifants- en Doring- riviere is gevind (Nei se onbevooroordeelde genetiese afstand = 0.355; F-statistiek vir subpopulasie teen die totaal = 0.877). Voorkeur en aanpassing vir bergstroom habitat, mag moontlik die historiese isolasie en daaropvolgende divergensie van Pseudobarbus phlegethon populasies tussen hierdie twee riviere verduidelik. Barbus calidus was geneties homogeen oor sy verspreiding (Nei se onbevooroordeelde genetiese afstand = 0-0.009; F-statistiek vir subpopulasie teen die totaal = 0.135). Dit word voorgestel dat Barbus calidus beter aangepas is as Pseudobarbus phlegethon om deur die hoofstroom te versprei. Die genetiese divergensie tussen Barbus calidus en Barbus erubescens (Nei se onbevooroordeelde genetiese afstand = 0.063) is kenmerkend van spesiespesifieke populasies. Dit lyk of daar 'n verlies aan genetiese diversiteit in rooivlerkie populasies vanafdie Doringrivier sytakke was (heterosigositeit = 0-0.01), in vergelyking met rooivlerkie populasies vanafdie Olifantsrivier sytakke (heterosigositeit = 0.01- 0.04). Uit die filogenetiese analise van allosiem kenmerke, blyk dit dat die saagagtige tetraploiede barbusse van Suid-Afrika die sistergroep van Pseudobarbus is, terwyl Barbus anoplus verwerp word as sisterspesie vir laasgenoemde. Dit is gevind dat Barbus calidus, Barbus erubescens en Barbus serra baie naverwant aan mekaar is. Dit lyk asof die voorvader van die rooivlerkies sedert ten minste die laat-Tersiêr in die Kaapse Plooiberge aanwesig was. Bewaringseenhede wat historiese divergensie, historiese genevloei en huidige genevloei voorstel, is geidentifiseer respektiewelik as Evolusionêre Beduidende Eenhede, Historiese Bestuurseenhede en Huidige Bestuurseenhede. Dit is gedoen op grond van verspreidings- en allosieminformasie. Die Olifants en Doring populasies van Pseudobarbus phlegethon moet as twee unieke Evolusionêre Beduidende Eenhede erken word. Barbus calidus en Barbus erubescens vorm aparte Evolusionêre Beduidende Eenhede. TwaalfHistoriese Bestuurseenhede en negentien Huidige Bestuurseenhede is geidentifiseer vir rooivlerkies van die Oifantsriviersisteem. Die grootte van Huidige Bestuurseenhede moet vergroot en beveilig word om verlies van genetiese diversiteit te vermy. Dit word voorgestel dat 'n herstelprogram van rooivlerkies moet poog om nuwe populasies, van ten minste Barbus erubescens en Doringrivier Pseudobarbus phlegethon Evolusionêre Beduidende Eenhede, te vestig. Baars en blouwang sonvis moet uitgeroei word, aangesien hulle die hoofoorsaak is vir die afname van rooivlerkies.
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Brand, Desiree. "The co-design of a visual arts-based intervention within the community of the Olifants River valley in South Africa." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2509.

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Thesis (MTech (Design)--Cape Peninsula University of Technology, 2016.<br>The research was motivated by my lived experience in the Olifants River community of Namaqualand. In this community there are many diverse ethnic and social groupings with considerable potential to contribute to indigenous knowledge and creative practices. These groupings are, however, fragmented, with no platform for their varied and rich cultural assets to be displayed and acknowledged. In addition, the research was motivated by the call for a platform for the arts in the region. It is argued that visual art practice is an instrumental tool in the advancement of both creativity and social cohesion in this community. The research commenced with a pilot study, comprising workshops, which were run by art practitioners from various sectors in the region. Primary literature that influenced the emerging research design was that of Solomon (2007) as well as the holistic cultural viewpoints of Schafer (2014). The organic process of qualitative research methods as described by Ellingson (2009) was a natural personal directive. Body mapping was used during a preparatory phase that led to the creative exploration of community members’ own identity. Storytelling and dance were included in the design methodology since they enabled a psychosocial process of validating art practice as an economic asset within the community as well as enhancing social cohesion in the community. Crystallisation methods implemented in the process-driven body map workshops were held for grassroots -, town – and township sectors in the Olifants River valley. Each of the workshops comprised ten participants who were invited to participate in a subsequent do-designed collaborative event.
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Botha, Petrus Johannes. "The distribution, conservation status and blood biochemistry of Nile crocodiles in the Olifants river system, Mpumalanga, South Africa." Thesis, University of Pretoria, 2011. http://hdl.handle.net/2263/25717.

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The outlook for Nile crocodiles in the Olifants River does not look optimistic. Since the increase in capacity of the Loskop and Flag Boshielo Dams, the crocodile population was left with no basking or nesting sites and has declined over the past 30 years. Shortly after the Massingire Dam in Moçambique filled to full capacity an estimated 160 crocodiles died in the Olifants River Gorge, a couple of kilometres upstream from the dam. The Olifants River is acknowledged by many experts as one of the most polluted rivers in South Africa and acid mine drainage, industrial pollution and untreated sewage in the river are all contributing to the poor water quality of the river. Further, the Department of Water Affairs and Forestry acknowledge that water demand already exceeds their capacity to supply and that the situation will worsen considerably in the near future. Aerial surveys of Nile crocodiles in the Olifants River was carried out during December 2005 and November 2009. An average total population of 714 Nile crocodiles were counted and corrected to an estimated 1140 individual crocodiles to eliminate the effects of undercounting. The Kruger National Park and specifically the area of the Olifants River Gorge was found to be one of the preferred habitat areas for crocodiles in the Olifants River as was the Flag Boshielo Dam, the area between the Blyde River and the western boundary of the Kruger National Park and the Olifants River between the Loskop Dam and the Flag Boshielo Dam. Repeated nesting in areas such as the Kruger National Park, the Flag Boshielo Dam and the Olifants River between the Loskop Dam and the Flag Boshielo Dam confirmed that these areas are critically important to the nesting success of Nile crocodiles in the Olifants River. The Elands River was confirmed as an important refuge area for Nile crocodiles in the Groblersdal-Flag Boshielo Dam area of the Olifants River. Surveys revealed an estimated total of only 15 crocodiles in the Loskop Dam and confirmed that no crocodiles in the large (2.1 - 4.0m TL) and very large size class (>4.0m TL) are currently present in the population. Blood biochemistry results indicate that the Olifants River Nile crocodile population probably suffers from chronic inflammation (especially in the Loskop Dam and Olifants River Gorge populations), infectious disease (particularly in the Loskop Dam population but all other sites also showed elevated values), possible inadequate diet and malnutrition (especially during the pansteatitis outbreak of August/September 2008) and are suffering serious immune problems in the Olifants River Gorge. A conservation and management plan is suggested which identifies threats to the continued existence of a viable Nile crocodile population in the Olifants River. Finally, it is suggested that the conservation status and risk of extinction of Nile crocodiles in the Olifants River be upgraded to the Endangered category since it currently complies to the following criteria; EN A2abce; C2a(i) published in the IUCN Red List Categories and Criteria Version 3.1 (IUCN, 2001).<br>Thesis (PhD)--University of Pretoria, 2011.<br>Centre for Wildlife Management<br>unrestricted
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Brand, Desireé. "The co-design of a visual arts-based intervention within the community of the Olifants River valley in South Africa." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2438.

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Thesis (MTech (Design)--Cape Peninsula University of Technology, 2016.<br>The research was motivated by my lived experience in the Olifants River community of Namaqualand. In this community there are many diverse ethnic and social groupings with considerable potential to contribute to indigenous knowledge and creative practices. These groupings are, however, fragmented, with no platform for their varied and rich cultural assets to be displayed and acknowledged. In addition, the research was motivated by the call for a platform for the arts in the region. It is argued that visual art practice is an instrumental tool in the advancement of both creativity and social cohesion in this community. The research commenced with a pilot study, comprising workshops, which were run by art practitioners from various sectors in the region. Primary literature that influenced the emerging research design was that of Solomon (2007) as well as the holistic cultural viewpoints of Schafer (2014). The organic process of qualitative research methods as described by Ellingson (2009) was a natural personal directive. Body mapping was used during a preparatory phase that led to the creative exploration of community members’ own identity. Storytelling and dance were included in the design methodology since they enabled a psychosocial process of validating art practice as an economic asset within the community as well as enhancing social cohesion in the community. Crystallisation methods implemented in the process-driven body map workshops were held for grassroots -, town – and township sectors in the Olifants River valley. Each of the workshops comprised ten participants who were invited to participate in a subsequent do-designed collaborative event.
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Soderberg, Keir. "Geochemistry of the fynbos ecosystem in a Table Mountain Group sub catchment of the Olifants River, Western Cape, South Africa." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/4225.

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Bibliography: leaves 104-118.<br>This study gives a first-order estimation of the chemical composition of the recharge, discharge, and ground waters, along with the bedrock, soil, and vegetation of the Olifants River Valley around Citrusdal. The valley occurs in a synclinal fold with the main aquifers, the Table Mountain Group (MG) sandstones of the Peninsula Formation and the Nardouw Subgroup, folded beneath the central valley.
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Gohell, Ashla Fiona. "The impact of water and sediment quality on the health of Oreochromis Mossambicus (Peters, 1852) and Schilbe Intermedius Ruppell, 1832 at the Phalaborwa Barrage in the Olifants River." Thesis, University of Limpopo, 2014. http://hdl.handle.net/10386/1225.

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Thesis (MSc. (Zoology)) -- University of Limpopo, 2014<br>The Olifants River is presently one of the most threatened river systems in South Africa. The Upper and Middle catchments are heavily impacted by anthropogenic activities, however little is known of the status of the river in the Lower catchment in the Limpopo Province. Thus the aim of this study was to evaluate the impact of water quality on the health of Oreochromis mossambicus and Schilbe intermedius at the Phalaborwa Barrage. This was achieved through assessing the water (seasonally) and sediment quality (bi-annually) at three sites in the Phalaborwa Barrage (inflow, middle and the wall). Ten specimens of each of the two selected fish species were seasonally collected using gill nets of different mesh sizes from May 2010 to January 2011. The water, sediment and the dorsal muscle tissues from both fish species were analysed for selected metals at an accredited laboratory by means of ICP-OES spectrometry and the human health risk factor upon consumption of fish contaminated with metals was assessed. Fish health was determined at the field laboratory by applying the HAI, PI and IPI. In addition, the condition factor (CF) was determined for the selected fish species during all seasons. All water constituents with the exception of turbidity during spring (wall), anions (Cl, F and SO4) and cations (Ca, K, Mg and Na) fell within the target water quality range (TWQR) for aquatic ecosystems throughout the study. Inorganic nitrogen concentrations showed eutrophic (spring) and oligotrophic conditions (autumn, winter and summer), while phosphorus indicated eutrophic (autumn, winter and spring) and hypertrophic (summer) conditions throughout the study. There was no significant difference in anions (F=0.07; df=3; p=0.97), cations (F=0.57; df=3; p=0.64) and nutrients (F=0.79; df=3; p=0.56) detected in water. The metals that were detectable in the water samples were: Al, Fe, Sn, B, Sr, Se, Ba, Mn, Sb and As, while in sediment all metals (Fe, Al, Ti, Mn, Ba, B, Zn, Ag, V, Cr, Ni, Sr, Sn, Co, Cu, Cd, Pb, As and Sb) were detected with the exception of Se. The average metal concentrations detected above the TWQR are; Al, Fe, Se, Sn, Sb and As, in the sediment only Cr and Cd were above suggested quality guidelines. There was no significant difference in metals detected in water (F=0.05; i df=3; p=0.98) and sediment (F=1.62; df=1; p=0.21). Higher HAI values were recorded for S. intermedius than O. mossambicus, indicating that O. mossambicus was in better health than S. intermedius. For S. intermedius, parasites contributed the most to the total HAI followed by abnormal liver conditions, haematocrit levels (internal variables) and abnormal gills (external variable). While for O. mossambicus, parasites, liver, haematocrit (internal variables), gills, eyes, fins and skin (external variables) contributed to the HAI values. There was no significant difference in HAI values for O. mossambicus (F=1.9; df=3; p=0.15) and S. intermedius (F=2.58; df=3; p=0.66) throughout the study. The PI and IPI for ectoparasites for both fish species, were higher than the PI for endoparasites. There was a significant difference for PI values of O. mossambicus (F=0.07; df=3; p=0.041) and S. intermedius (F=3.65; df=3; p=0.019) during the study. Oreochromis mossambicus had higher CF values than S. intermedius and both fish species had values that indicated good fish. Metals that were detectable in O. mossambicus muscle tissue included: Ba, B, Zn, Fe, Sr, Al, Mn, Cr, Ag, Pb, Ni, Cu, Se, V, Sb, Ti, Sn and Co, while for S. intermedius Ba, B, Zn, Fe, Al, Cr, Sr, Mn, Cu, As, Pb, Se, Sn, Ag, Ti, Ni, Sb and Co were recorded. There was no significant difference in bioaccumulation levels between the two fish species (F=1.412; df=3; p=0.250). The human health risk assessment indicated that fish muscle tissues are unsuitable for continuous (weekly/daily) consumption. As some carcinogenic metals i.e. Pb, Cr and Sb for O. mossambicus and Pb, As and Cr for S. intermedius were detected at HQ levels of more than 50 times the recommended value of one. In conclusion, the Phalaborwa Barrage is impacted by metals (Al, Fe, Se, Sn, Sb and As) and occasionally with nutrients. The water and sediment quality and metal bioaccumulation have confirmed the latter statement and to a lesser extent the HAI, PI and IPI. The human risk assessment done indicated that continuous consumption of fish by humans, especially O. mossambicus may have adverse effects on the health of humans.
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Mogashoa, M. E. "Seasonal variation in haematological parameters and oxidative stress bio-markers for selected fish species collected from the Flag Boshielo Dam, Olifants River System, Limpopo Province, South Africa." Thesis, University of Limpopo, 2015. http://hdl.handle.net/10386/1188.

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Thesis (M.Sc. (Physiology)) --University of Limpopo, 2015<br>Water is an essential and yet scarce resource, which has a vital role for human use and also serve as a habitat for numerous organisms in aquatic environments. Despite its scarcity there have been many reports indicating that it is continually polluted by domestic, agricultural, mining and other anthropogenic activities; subsequently affecting the health of organisms residing in such water bodies. Fish have been selected as the bio-monitoring species due to its direct interaction with the environment; thereby making it an appropriate model to monitor and evaluate the health status of the environment. The feral population of the alien species, Hypopthalmichtys molitrix (Valenciennes, 1844) commonly known as the silver carp in Flag Boshielo Dam has been considered a healthy population. However, this perception changed considerably after reports of lethargic, dying fish were first noted in 2011. Currently the sporadic deaths amongst mature specimens (>0.7m) persist; and the reason(s) for their demise remains unclear. Therefore, the aim was to employ a seasonal study design to investigate the health status of selected fish species such as H. molitrix in Flag Boshielo Dam by evaluating haematological parameters, oxidative stress biomarkers and bio-accumulation levels of particular transition metals. Seasonal surveys were carried out from February 2012 to January 2013 at Flag Boshielo Dam, Olifants River System, Limpopo Province. The locality surrounding the dam is known to be in an agriculture and mining catchment. Hypopthalmichtys molitrix and Labeo rosae (Steindachner, 1894) commonly known as the rednose labeo were collected with the use of scoop nets, conventional angling gear and gill nets. Following collection, morphometric measurements were taken and blood was collected. The blood samples required for further analysis at the Medical Science Department, University of Limpopo were kept on ice (4˚C). After the collection of all blood samples the specific fish was sacrificed and muscle samples were collected for bio-accumulation analysis and gills and liver samples were collected for the measurement of oxidative stress biomarkers. These tissue samples were rapidly frozen and kept frozen (-85˚C) until further analysis. Haematological parameters from the study reflected a variation amongst comparison of the inter- and intra-species. It was observed that mature H. molitrix suffered from anaemia. The response of glutathione-S-transferase (GST) and thiobarbituric acid reactive substances (TBARS) was relatively constant throughout all seasons when the young (<0.5m) and mature H. molitrix (0.6 – 0.90m) specimens were compared. However, the catalase (CAT) response of mature H. molitrix was dramatically impaired. This would increase their vulnerability to oxidative stress. Bioaccumulation levels of the eleven selected transition elements exhibited various trends. Metals such as Molybdenum (Mo), Vanadium (V), (Chromium) Cr, Cobalt (Co), Zinc (Zn), Cadmium (Cd) and Mercury (Hg) exhibited seasonal bio-accumulation levels that were in support of the various feeding behaviours of the fish species in this study. On the other hand, metals such as Manganese (Mn), Iron (Fe), Copper (Cu), Zinc (Zn), Cadmium (Cd) and Mercury (Hg) also illustrated the potential to be contributing factors in the death of the mature specimens. In conclusion, the findings from this study illustrate the complex nature of metabolic disturbances resulting in the death of mature H. molitrix specimens. It is clear that no single aspect investigated in this study could be solely implicated as the major cause of death. This multifactorial presentation necessitates further haematological assessment focussing on blood cell morphology and pathology, as well as investigations into other oxidative stress biomarkers in liver and gill tissue. In addition, identifying the most appropriate tissue type for future bio-accumulation measurements of transition metals in this feral population is necessitated. It is further suggested that neuro-muscular assessments, focussing on neurotransmitters such as γ-aminobutyric acid (GABA) and acetylcholine (Ach), form part of the investigation into the lethargic behaviour of the mature fish.
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Ramalepe, Tshepiso Promise. "Effects of pollution and metazoan parasites on the health and oxidative stress biomarkers of two cyprinid fish species in the Olifants River System, South Afrrica." Thesis, University of Limpopo, 2015. http://hdl.handle.net/10386/1525.

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Thesis (M. Sc. (Zoology)) -- University of Limpopo, 2015<br>The unprecedented expansion in human population and industry, since the industrial revolution in the late 1700s, has led to increased anthropogenic activities which have indisputably impacted freshwater ecosystems and biological communities therein, including fish. Although this has understandably been the focus, under natural aquatic conditions, no organism is only affected by pollution. Parasites have also been shown in a number of interdisciplinary studies to affect the health of aquatic hosts (amphibians, crustaceans, fish, and mammals). This is illustrated in a number of comprehensive studies the detrimental effects parasites exacerbate when their hosts (fish) are stressed. Therefore, the ability of parasites to interact with anthropogenic stressors, as well as effects they have on the genetic, cellular or tissue level of their host is crucial in conservation and sustaining aquatic biodiversity. As such, the present study examined the combined effects of pollution and metazoan parasites on the health and oxidative stress biomarkers, evaluated for the first time for silver carp, Hypophthalmichthys molitrix (Valenciennes, 1844) and rednose mudfish, Labeo rosae Steindachner, 1894, in one of South Africa’s impacted freshwater ecosystems, Flag Boshielo Dam, Olifants River System, Limpopo Province. Seasonal surveys were conducted from February 2012–January 2013. A total of 111 H. molitrix and 116 L. rosae fish specimens were collected using conventional angling gear, scoop and gill nets with stretched mesh sizes of 30–110 mm. The two selected cyprinid fish species were assessed for oxidative stress biomarkers [Glutathione S-transferase (GST), lipid peroxidation (MDA) and Total Antioxidant Capacity (TAC)] and parasitism of metazoan parasites. Concentrations of biomarkers of oxidative damage and antioxidant defense in the gill and liver tissue were measured to assess how these major organs of the immune system responded to oxidative stress associated with parasitic infections. In addition, water quality analyses were carried out by testing an assay of physico-chemical parameters to establish the level of contamination. Fish health was assessed using the Health Assessment Index (HAI), refined Parasite Index (PI), Inverted Parasite Index (IPI) and Condition Factor (K) protocols. Relative to previous studies at Flag Boshielo Dam, water quality results showed an increase of nutrients, major ions and several metals which may have adverse effects that may comprise fish health; however, this dam remains moderately polluted in a mesotrophic state. The fish health assessment results indicated that H. molitrix was more affected in terms of the necropsy and parasite based assessments (HAI, IPI and K) with mean±SD of 65.68±35.51; 68.29±25; 0.82±0.20, respectively, as compared to 39.14±22.44; 28.79±18.33; 1.17±0.21 for L. rosae during the study. In addition, significantly higher parasitic infections (mean prevalence of infection with any species of parasite = 45.3±0.13) were observed for H. molitrix than L. rosae (12.0±0.05). Furthermore, there was considerable variation in biomarker concentration between highly infected and non-infected fish, for and between each species and tissues with regard to parasite infection, suggesting that the specific functions of each tissue are associated with their susceptibility to oxidative stress, as well as their ability to defend against oxidative damage. These results illustrate that although fish are affected by aquatic contaminants they are to an extent affected by parasites, which may act synergistically on the health of the two fish species. Most importantly, it was suggested that knowledge on the parasites of alien H. molitrix when compared to indigenous L. rosae may give an indication of how adaptive this fish are to new localities as well as expands the information on the rarely studied biology, epizootiology and ecological interactions of these two cyprinid species. Keywords: Health Assessment Index, refined Parasite Index, Inverted Parasite Index, Condition Factor, water quality, lipid peroxidation, Glutathione S-transferase, Total Antioxidant Capacity, Hypophthalmichthys molitrix, Labeo rosae, Flag Boshielo Dam.
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Books on the topic "Olifants river (South Africa)"

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du Plessis, Anja. Freshwater Challenges of South Africa and its Upper Vaal River. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49502-6.

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Arranz, Roberto. Application of the water evaluation and planning (WEAP) model to assess future water demands and resources in the olifants catchment, South Africa. International Water Management Institute, 2007.

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Jacobsz, Schalk W. Die verbond van Bloedrivier. Libanon₋Uitgewers, 1996.

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The mirror at midnight: A South African journey. Houghton Mifflin, 2007.

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The mirror at midnight: A South African journey. Viking, 1990.

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Morris, Alan G. The skeletons of contact: A study of protohistoric burials from the Lower Orange River Valley, South Africa. Witwatersrand University Press, 1992.

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Alexander, Jocelyn. Violence & memory: One hundred years in the "dark forests" of Matabeleland. James Currey, 2000.

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Minnaar, H. Composition and evolution of the proterozoic Vioolsdrif Batholith (including the Orange River Group), northern Cape Province, South Africa. Council for Geoscience, 2014.

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Conserved spaces, ancestral places: Conservation, history and identity among farm labourers in the Sundays River Valley, South Africa. University of KwaZulu-Natal Press, 2014.

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The horns of the beast: The Swakop River Campaign and World War I in South-West Africa, 1914-15. Helion & Company Ltd., 2014.

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Book chapters on the topic "Olifants river (South Africa)"

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Naidoo, Suvania. "The Nature of Acid Mine Drainage in the Vaal River System." In Acid Mine Drainage in South Africa. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44435-2_4.

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du Plessis, Anja. "South Africa’s Water Availability and Use." In Freshwater Challenges of South Africa and its Upper Vaal River. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49502-6_4.

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Cavanagh, Edward. "Conclusion: Land Regimes and Property Rights on the Orange River." In Settler Colonialism and Land Rights in South Africa. Palgrave Macmillan UK, 2013. http://dx.doi.org/10.1057/9781137305770_6.

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du Plessis, Anja. "Water Scarcity and Other Significant Challenges for South Africa." In Freshwater Challenges of South Africa and its Upper Vaal River. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49502-6_7.

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du Plessis, Anja. "Global Water Availability, Distribution and Use." In Freshwater Challenges of South Africa and its Upper Vaal River. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49502-6_1.

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du Plessis, Anja. "Conclusions and Evaluations." In Freshwater Challenges of South Africa and its Upper Vaal River. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49502-6_10.

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du Plessis, Anja. "Global Water Quality Challenges." In Freshwater Challenges of South Africa and its Upper Vaal River. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49502-6_2.

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du Plessis, Anja. "Global Water Scarcity and Possible Conflicts." In Freshwater Challenges of South Africa and its Upper Vaal River. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49502-6_3.

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du Plessis, Anja. "The Upper Vaal WMA." In Freshwater Challenges of South Africa and its Upper Vaal River. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49502-6_5.

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du Plessis, Anja. "Primary Water Quality Challenges for South Africa and the Upper Vaal WMA." In Freshwater Challenges of South Africa and its Upper Vaal River. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49502-6_6.

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Conference papers on the topic "Olifants river (South Africa)"

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Nieuwoudt, W. L. "Pollution policies and market approaches in the Olifants River, South Africa." In WATER RESOURCES MANAGEMENT IV. WIT Press, 2007. http://dx.doi.org/10.2495/wrm070481.

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"Assessment of Microbial Quality of Surface Water Sources of Luvuvhu River Catchment, South Africa." In Nov. 27-28, 2017 South Africa. EARES, 2017. http://dx.doi.org/10.17758/eares.eap1117053.

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"Impact of Tea Processing Water Wastes on Phytoplankton Composition of Tshinane River, Limpopo Province." In Nov. 27-28, 2017 South Africa. EARES, 2017. http://dx.doi.org/10.17758/eares.eap1117054.

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PIETERSEN, JACOBUS P. J., and OCKERT J. GERICKE. "AREAL REDUCTION FACTORS FOR DESIGN RAINFALL ESTIMATION IN THE MODDER-RIET RIVER BASIN, SOUTH AFRICA." In RIVER BASIN MANAGEMENT 2019. WIT Press, 2019. http://dx.doi.org/10.2495/rbm190041.

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"Seasonal Metal Speciation in the Sabie River Catchment, Mpumalanga, South Africa." In Nov. 16-17, 2020 Johannesburg (SA). Eminent Association of Pioneers, 2020. http://dx.doi.org/10.17758/eares10.eap1120251.

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Fuchs, Nick, Stuart Withycombe, and John Anderson. "Msikaba and Mtentu River Bridges – Large Scale Infrastructure in Rural South Africa." In IABSE Symposium, Nantes 2018: Tomorrow’s Megastructures. International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/nantes.2018.s12-65.

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Jovanovic, N. Z., R. D. H. Bugan, G. Frantz, W. de Clercq, and M. Fey. "Hydrosalinity fluxes in a small scale catchment of the Berg river (South Africa)." In WATER POLLUTION 2008. WIT Press, 2008. http://dx.doi.org/10.2495/wp080591.

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De Clercq, W. P., M. V. Fey, and N. Z. Jovanovic. "An overview of the salinization problem in the Berg river catchment (South Africa)." In RAVAGE OF THE PLANET 2009. WIT Press, 2009. http://dx.doi.org/10.2495/rav090331.

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GERICKE, OCKERT J. "DEVELOPMENT AND ASSESSMENT OF A SINGLE-EVENT DESIGN FLOOD ESTIMATION TOOL: CASE STUDY IN FOUR CLIMATOLOGICAL REGIONS OF SOUTH AFRICA." In RIVER BASIN MANAGEMENT 2019. WIT Press, 2019. http://dx.doi.org/10.2495/rbm190061.

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Berge, T., R. Cooper, M. Smith, U. Strecker, G. Taylor, and R. Uden. "Progressive Seismic Data Mining for Reservoir Characterization, Ibhubesi Field, Orange River Basin, South Africa." In 8th SAGA Biennial Technical Meeting and Exhibition. European Association of Geoscientists & Engineers, 2003. http://dx.doi.org/10.3997/2214-4609-pdb.144.47.

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Reports on the topic "Olifants river (South Africa)"

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Mpahlele, R. E., T. M. Malakalaka, and B. Hedden-Dunkhorst. Characteristics of smallholder irrigation farming in South Africa: a case study of the Arabie-Olifants River Irrigation Scheme. International Water Management Institute (IWMI), 2000. http://dx.doi.org/10.5337/2011.0040.

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