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Thèses sur le sujet « Pinnipedia Ecology South Africa »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 4 février 2022

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1

Stewardson, Carolyn Louise. "Biology and conservation of the Cape (South African) fur seal arctocephalus pusillus pusillus (Pinnipedia: Otariidae)from the Eastern Cape Coast of South Africa /." View thesis entry in Australian Digital Theses Program, 2001. http://thesis.anu.edu.au/public/adt-ANU20030124.162757/index.html.

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Stewardson, Carolyn Louise, and carolyn stewardson@anu edu au. "Biology and conservation of the Cape (South African) fur seal Arctocephalus pusillus pusillus (Pinnipedia: Otariidae) from the Eastern Cape Coast of South Africa." The Australian National University. Faculty of Science, 2002. http://thesis.anu.edu.au./public/adt-ANU20030124.162757.

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[For the Abstract, please see the PDF files below, namely "front.pdf"] CONTENTS. Chapter 1 Introduction. Chapter 2 Gross and microscopic visceral anatomy of the male Cape fur seal with reference to organ size and growth. Chapter 3 Age determination and growth in the male Cape fur seal: part one, external body. Chapter 4 Age determination and growth in the male Cape fur seal: part two, skull. Chapter 5 Age determination and growth in the male Cape fur seal: part three, baculum. Chapter 6 Suture age as an indicator of physiological age in the male Cape fur seal. Chapter 7 Sexual dimorphism in th

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Avis, Anthony Mark. "Coastal dune ecology and management in the Eastern Cape." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1003753.

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The importance of understanding the ecological functioning of coastal dune systems is emphasized as being fundamental to the correct management of the dune landscape. Dune vegetation along the Eastern Cape coastline, from Cape St Francis in the west to Kei Mouth in the east was described in terms of the distribution and phytochorological affinities of the taxa. At a regional scale species distribution was strongly influenced by both the climate, particularly rainfall, and the phytochorological affinities of the taxa. Seven communities were defined using TWINSPAN, and the interrelationships bet

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Swanepoel, Barbara Anna. "The vegetation ecology of Ezemvelo Nature Reserve, Bronkhorstspruit, South Africa." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-09142007-143511.

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Akoto, William. "Valuing preferences for freshwater inflows into selected Western and Southern Cape estuaries." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/915.

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An estuary is the last stage of a river. It is where the river meets the sea. Estuaries are one of the most significant features of the South African coastline. In recent years, South Africa has witnessed an increase in the demand for freshwater for both industrial and domestic purposes. At the same time, there has been a gradual deterioration of river systems and their catchments. To add to this, there has been a gradual reduction in the amount of recorded rainfall, which is the primary source of freshwater for rivers. This has resulted in decreased freshwater inflow into estuaries, a situati

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Ntshotsho, Phumza. "Towards evidence-based ecological restoration in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71969.

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Thesis (PhD)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Widespread, human-induced ecosystem degradation and the associated biodiversity loss pose a direct threat to human wellbeing. While there is no substitute for healthy, self-sustaining ecosystems, ecological restoration offers an attractive, and indeed inevitable, supplement where conservation alone is not sufficient to support ecosystem integrity. Restoration is undergoing a revolution, where evidence-based (EB) practice is emerging as a new approach to increase the chances of successfully achieving restoration goals. EB practic

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Prinsloo, Dominique. "Impacts of African elephant feeding on white rhinoceros foraging opportunities." Thesis, Nelson Mandela University, 2017. http://hdl.handle.net/10948/13768.

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In this study, I investigated the interaction between two megaherbivores, the African elephant and white rhinoceros, that has the potential to impact grazing lawns of which white rhino are the creators and maintainers and elephants are potentially the modifiers. I hypothesized that as elephants browse, they discard a variety of coarse woody debris onto the ground; should this woody debris (of varying amounts and sizes) fall onto grazing lawns, white rhino either move them, consume grass around the woody debris or abandon the lawn entirely. If high levels of woody debris are deposited here, gra

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Manuel, Theodore Llewellyn. "The biology and ecology of Bifurcaria brassiceaformis (Kütz) Barton (Phaeophyta, Fucales)." Master's thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/22478.

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Summary in English.<br>Bibliography: pages 146-169.<br>The biology, population dynamics, and the environmental tolerances (temperature and light) in laboratory culture, of the endemic intertidal South African fucoid Bifurcaria brassicaeformis (Kütz) Barton have been investigated. A general description is included of the morphology and anatomy, and comparisons made with that of other species in the genus. Studies on plants collected from contrasting habitats on the lowshore and from mid-shore pools revealed that while cortical thickness of vegetative uprights were similar for both habitats, med

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Muller, Cuen. "Evaluating the importance of mangroves as fish nurseries in selected warm temperate South African estuaries." Thesis, Nelson Mandela Metropolitan University, 2017. http://hdl.handle.net/10948/12080.

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The value of mangrove habitats as fish nurseries was assessed by comparing communities of early stage and juvenile fishes between estuaries with and without mangroves. Early stage fishes were sampled using boat-based plankton towing while juveniles were sampled by seine netting. Sampling took place at five sites spaced 1 km apart starting near the estuary mouth in four estuaries along the temperate coastline of the Eastern Cape Province of South Africa. Four estuaries were selected based on shared similarities which included catchment area, estuarine area and shared habitats barring the presen

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Loftus, A. J. "A Political Ecology of Water Struggles in Durban, South Africa." Thesis, Royal Holloway, University of London, 2006. http://digirep.rhul.ac.uk/items/83d8dfba-f70b-7131-1068-e38de07290fa/1/.

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This thesis looks at the relationshp between water and social power. It attempts to answer two questions: who controls the distribution of water in the South African city of Durban? And how might this distribution be transformed in positive democratic ways? In attempting to answer these questions, the thesis provides insights into post-apartheid South African society and the possibilities for democratic social change. The framework of analysis builds upon work conducted in urban political ecology. In particular, I argue that urban environments, indeed all environments, should be understood as

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Jenkins, Andrew Robert. "Behavioural ecology of Peregrine and Lanner falcons in South Africa." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/16100.

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Bibliography: p. 88-94.<br>The Peregrine Falcon Falco peregrinus is a specialized predator of birds. It occurs almost worldwide but is generally uncommon. In many areas, it is sympatric with one of a complex of similar, less specialized, congeneric species (subgenus Hierofalco, the desert falcons). Peregrine density and productivity tend to decrease with latitude, while desert falcons may be most successful in the tropics. This study compares the biology of Peregrines and sympatric Lanner Falcons F. biarmicus in South Africa, and examines the relative influence of resource limitation and inter

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Bergamino, Roman Leandro. "Spatial and temporal variations in trophic connectivity within an estuarine environment : benthic-pelagic and terrestrial-aquatic linkages via invertebrates and fishes." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1017799.

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Estuarine ecosystems are among the most biologically productive areas and they provide important ecosystem services such as erosion control, habitat and refugia for several species. These environments are characterized by the presence of a variety of organic matter sources due to their transitional position between rivers and the sea. The biotic compositions can undergo spatial and seasonal changes along the estuary due to the spatial and temporal fluctuations of environmental factors such as salinity, temperature and seston loads. Therefore, the different combinations of biotic and abiotic fa

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Roets, Francois. "Ecology and systematics of South African Protea-associated Ophiostoma species." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019.1/1469.

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McCord, Meaghen Erica. "Aspects of the ecology and management of the Soupfin shark (Galeorhinus galeus) in South Africa." Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1005066.

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Global trends in teleost fisheries indicate significant population declines. Thus, alternative fisheries are being developed to meet the growing economic and nutritional demands of the expanding human population. Recently, it has been established that elasmobranch fisheries may fulfill these demands. As many elasmobranchs possess life-history characteristics that make them particularly vulnerable to overfishing, it is imperative to develop management strategies prior to the inception of these fisheries to ensure sustainable resource utilisation. In South Africa, elasmobranchs have been commerc

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Gray, David Richard. "Studies of the biology and ecology of the high shore South African limpet, Helcion pectunculus (Mollusca : patellogastropoda)." Thesis, Rhodes University, 1997. http://hdl.handle.net/10962/d1005464.

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Investigations were carried out into aspects of the bio!ogy and ecology of Helcion pectunculus along the coait of South Africa. These included studies of the distribution, density and biomass of the limpet at six sites along the east coast plus one site on the west coast; the growth of H pectunculus on both west and east coasts; a comparison of the reproductive biology of the east and west coast populations; the foraging activity and feeding behaviour of H pectunculus and the driving forces behind the rhythmic behaviour of this limpet; the importance of the crevice environment in the biology a

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Mann, Gareth. "Aspects of the ecology of leopards (Panthera Pardus) in the Little Karoo, South Africa." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1012241.

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Leopards (Panthera pardus) are the most common large predators, free roaming outside of protected areas across most of South Africa. Leopard persistence is attributed to their tolerance of rugged terrain that is subject to less development pressure, as well as their cryptic behaviour. Nevertheless, existing leopard populations are threatened indirectly by ongoing transformation of natural habitat and directly through hunting and conflict with livestock farmers. Together these threats may further isolate leopards to fragmented areas of core natural habitat. I studied leopard habitat preferences

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Smallwood, Samuel. "Evaluating ecological monitoring systems on Mabula Game Reserve, Limpopo, South Africa." Pretoria : [s.n.], 2010. http://upetd.up.ac.za/thesis/available/etd-02162010-105501.

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Du, Plessis Morne Andre. "Behavioural ecology of the Redbilled Woodhoopoe Phoeniculus purpureus in South Africa." Doctoral thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/6252.

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Includes bibliographies.<br>A study was made of two Redbilled (Green) Woodhoopoe Phoeniculus purpureus populations spanning an eight year period (1981-1988) and 258 'flock-years', in the eastern Cape Province of South Mrica. The main objectives of the study were to investigate (1) why woodhoopoes live in groups; (2) why nonbreeders do not breed; and, (3) why nonbreeders provision young that are not their own? Ecological and demographic data were gathered in addition to detailed behavioural observations of 54 woodhoopoe flocks. The following experimental manipulations were performed: (1) breede

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Grange, Neil. "The influence of contrasting freshwater inflows on the feeding ecology and food resources of zooplankton in two eastern Cape estuaries, South Africa." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1005400.

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The trophodynamic implications of reduced freshwater inflow on the zooplankton of eastern Cape estuaries was investigated by a comparison of the community composition and standing stocks, grazing rates and food resources of zooplankton in two systems, the Kariega and the Great Fish estuaries, which are subject to contrasting freshwater inflow. The climate of South Africa is semi-arid, and the low rainfall, coupled with high evaporative loss, result in the region having one of the lowest conversions of rainfall to run-off in the world. In addition, many of the major rivers are extensively impou

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20

Paterson, Angus William. "Aspects of the ecology of fishes associated with salt marshes and adjacent habitats in a temperate South African estuary." Thesis, Rhodes University, 1999. http://hdl.handle.net/10962/d1013010.

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There is a paucity of published information on fish utilization of salt marshes outside North America. This dissertation represents the first intensive examination of the ichthyofauna associated with salt marshes in southern Africa and examines the species composition, diversity, size structure, distribution and estuarine dependence of fishes that utilize salt marshes in the Kariega Estuary. The research was concentrated on Taylor's salt marsh, with comparative studies being conducted on other salt marshes and habitats within the marine dominated Kariega Estuary. The possible importance of sal

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Hertling, Ursula Margret. "Ammophila arenaria (L.) Link (marram grass) in South Africa and its potential invasiveness." Thesis, Rhodes University, 1998. http://hdl.handle.net/10962/d1003767.

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Ammophila arenaria (L.) Link is a European sand binding plant which was introduced to South Africa in the 1870's for the purpose of dune stabilisation. Because of its known invasiveness along the west coast of North America, and the problems South African ecosystems experience with alien invader plants, it was deemed necessary to study the biology and ecology of this species in South Africa. The aim of this thesis is to establish the potential invasiveness of A. arenaria on Cape coastal dunes and assess whether its use for dune stabilisation is still justifiable. A. arenaria occurs nowadays be

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22

Foster, Gregory George. "Growth, reproduction and feeding biology of Turbo sarmaticus (Mollusca : Vetigastropoda) along the coast of the Eastern Cape Province of South Africa." Thesis, Rhodes University, 1998. http://hdl.handle.net/10962/d1005391.

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Investigations were carried out on aspects of the biology of the vetigastropod Turbo sarmaticus. Studies included: 1) the distribution and standing stock of this animal at four sites along the coast of the Eastern Cape Province of South Africa; 2) the growth rate of animals on a wave-cut platform; 3) the reproductive cycle of an intertidal population; and 4) aspects of the feeding biology examining the ability of this mollusc to consume and digest six macroalgae, the influence of algal diet on growth rate and reproductive fitness and the polysaccharolytic activity of the digestive enzymes. On

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Lloyd, Penn. "A study of the Pycnonotus bulbul species complex in Southern Africa." Thesis, Rhodes University, 1995. http://hdl.handle.net/10962/d1005470.

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The three Pycnonotus bulbuls endemic to Africa, P. barbatus, P. nigricans and P. capensis, occupy mutually exclusive distributions in southern Africa. These species are closely related and appear to occupy very similar ecological niches, only in different regions. Using a multifaceted approach, this study attempts to explain the ecology of this species complex. All three species show similar physiological responses to temperature extremes, and are therefore unlikely to be directly limited by environmental temperature. However, their distributions are highly correlated to a complex of environme

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Snow, Gavin Charles. "Contributions to the use of microalgae in estuarine freshwater reserve determinations." Thesis, Nelson Mandela Metropolitan University, 2007. http://hdl.handle.net/10948/709.

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The ecologist Garrett Hardin (1968) introduced a useful concept called the tragedy of the commons, which describes how ecological resources become threatened or lost. The term “commons” is based on the commons of old English villages and is symbolic of a resource that is shared by a group of people. If every person were to use each resource in a sustainable fashion it would be available in perpetuity. However, if people use more than their share they would only increase their personal wealth to the detriment of others. In addition, an increase in the population would mean that the size of each

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Sale, Michael Charles. "The value of freshwater inflows into the Kowie, Kromme and Nahoon Estuaries." Thesis, Nelson Mandela Metropolitan University, 2007. http://hdl.handle.net/10948/599.

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An estuary can be defined as a partially enclosed, coastal body of water which is either permanently or periodically open to the sea and within which there is a measurable variation of salinity due to the mixture of sea water with fresh water derived from land drainage. Estuaries are extremely important environmental assets and the management of them is dependent on the active involvement of the people whose livelihoods depend on them. There have been steady decreases in freshwater inflows into them during the past century due to abstraction of river water for human consumption and alien tree

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Kraaij, Tineke. "Fire regimes in eastern coastal fynbos: drivers, ecology and management." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1008047.

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Conventional knowledge of fynbos fire ecology is based on the summer-autumn fire regimes of the western Cape Floral Kingdom (CFK) where the climate is Mediterranean. However, the climate in the eastern coastal-CFK is milder and rainfall occurs year-round, with presumed effects on fire regimes. The Garden Route National Park (GRNP) has recently been established in the region, in a landscape where indigenous forests, fire-prone fynbos shrublands and fire-sensitive plantations of invasive alien trees are interspersed. The park faces considerable challenges related to the management of fire, inclu

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Palmer, Anthony Riordan. "Vegetation ecology of the Camdebo and Sneeuberg regions of the Karoo biome, South Africa." Thesis, Rhodes University, 1989. http://hdl.handle.net/10962/d1002021.

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An hierarchical syntaxonomic classification of the vegetation of the Camdebo and Sneeuberg regions of the karoo biome is presented as a second approximation after the earlier work by Acocks (1953). Details on the geomorphology, geology, climate, and early vegetation history of the area are given. The vegetation of the study area was stratified with the aid of Landsat imagery and the community classification was generated using two-way indicator species analysis (Twins pan) which produced ordered phytosociological tables. Tabular comparisons and final sorting of tables are according to the meth

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Fabricius, Christo 1956. "The impact of land use on biodiversity in xeric succulent thicket, South Africa." Doctoral thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/9512.

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Bibliography: leaves 100-114.<br>Human-induced land management practices are key factors which influence the dynamics of landscapes, land elements and biotic communities in Xeric Succulent Thicket, a notoriously fragile and low resilience ecosystem in the Eastern Cape, South Africa. In its natural state this vegetation type is characterized by a continuous mosaic of clumps of diverse woody shrubs in a matrix of grass, hardy dwarf shrubs and bare ground. When indigenous herbivores are replaced by domestic livestock at unsustainable stocking rates, the ratio of clump to interclump areas decrease

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Chege, Jedidah. "Valuing preferences for freshwater inflows into five Eastern Cape and Kwazulu-Natal estuaries." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/932.

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An estuary, according to the National Water Act of 1998, is a partially or fully enclosed body of water which is open periodically or permanently to the sea within which the sea water can be diluted, to an extent that is measurable with freshwater from inland. Estuaries and the lands surrounding them are places of transition from land to sea, and from freshwater to saltwater. Although influenced by the tides, estuaries are protected from the full force of ocean waves, winds, and storms by the reefs, barrier islands, or fingers of land, mud, or sand that surround them. South Africa’s estuaries

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Jordaan, Tembisa Nomathamsanqa. "The effect of mussel bed structure on the associated infauna in South Africa and the interaction between mussel and epibiotic barnacles." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1005360.

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Mussels are important ecological engineers on intertidal rocks where they create habitat that contributes substantially to overall biodiversity. They provide secondary substratum for other free-living, infaunal or epifaunal organisms, and increase the surface area for settlement by densely packing together into complex multilayered beds. The introduction of the alien invasive mussel Mytilus galloprovincialis has extended the upper limit of mussels on the south coast of South Africa, potentially increasing habitat for associated fauna. The aim of this study was to describe the structure of muss

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Wagiet, Mogamat Fadli. "Teaching the principles of ecology in the urban environment: an investigation into the development of resource materials." Thesis, Rhodes University, 1996. http://hdl.handle.net/10962/d1003684.

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The combined potential of two crucial factors in 1993, which afforded the promotion of socially just and ecologically sustainable ways of living, led to the instigation of this research project. The first was the imminence og our first democratic election; the second was the possible introduction of environmental education into formal education. In the light of these momentous shifts, it became apparent to me that teachers would have to radically transform their practices in order to play their part in transforming society from the dark days of apartheid into one of equity and harmony. The imp

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Jewell, Oliver Joseph David. "Foraging ecology of white sharks Carcharodon carcharias at Dyer Island, South Africa." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/30926.

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Dyer Island is thought to host one of the most abundant populations of white sharks on the planet; this is often credited to the large (55 – 60,000) Cape fur seal colony at Geyser Rock. Yet relatively little work has ever been produced from the area. This may be attributed to the harshness in its location as a study site, exposed to wind and swell from west to east which limits research periods. This study accounts for over 220 hrs of manual tracking at Dyer Island with a further 68 added from the inshore shallow areas of the bay. Sharks focused their movements and habitat use to reefs

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Green, David Bruce. "Foraging ecology of Cape Gannets (Morus Capensis) at Bird Island, Algoa Bay." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1020790.

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The Cape gannet has undergone considerable population change and redistribution over the past 50 years. This has been linked to shifts in the abundance and distribution of their dominant prey, sardine and anchovy. Five breeding colonies, along the west coast of Southern Africa, have shown rapid population declines as a result of reduced prey availability. In contrast, a single colony (Bird Island, Algoa Bay) on the south coast of South Africa has, over the same period, grown fivefold and now supports approximately two thirds of the total population. Due to its conservation importance, and isol

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Theron, Natalie. "Mite communities within Protea infructescences in South Africa." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6816.

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Thesis (MScConEcol)--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: The role of mites as primary vectors of various fungi within Protea infructescences was recently confirmed and raised questions about their general diversity and their role within this unique niche. Although mites evidently form an integral part of Fynbos ecosystems and probably play a significant role in Protea population dynamics, there is a general void in our knowledge of mite diversity within the Cape Floristic Region. These organisms do not only affect ecological processes within the CFR, but also the economic va

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Coombs, Gareth. "Ecology and degree of specialization of South African milkweeds with diverse pollination systems." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1003758.

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Like orchids, the complexity of flowers found in asclepiads (Asclepiadoideae, Apocynaceae) and the fact that pollen is presented as pollinaria, offers excellent opportunities to study various aspects of plant-pollinator interactions. In this thesis I investigated two broad themes: ecological aspects of the pollination biology of hymenopteran and fly-pollinated asclepiads as well as the degree of specialization to certain pollinators in these species. Colonizing plants often reproduce through self-pollination, or have highly generalized pollination systems, or both. These characteristics facili

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Wadeson, R. A. (Roy A). "The development of the hydraulic biotope concept within a catchment based hierarchical geomorphological model." Thesis, Rhodes University, 1996. http://hdl.handle.net/10962/d1005501.

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This thesis develops a technique for the identification, classification and quantification of instream flow environments. These features have been traditionally referred to as 'habitats' by lotic ecologists, in this research they are termed 'hydraulic biotopes'. The hydraulic biotope is the lowest of six nested levels of a hierarchical geomorphological model. This model has been developed as a tool to assist river managers, researchers and conservationists to categorise or classify rivers with respect to their geomorphic characteristics. Each level of the model provides data at a different lev

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Yani, Vuyolwethu Veronica. "Ecosystem health of the Nelson Mandela Bay sandy beaches." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1075.

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An investigation of ecosystem functioning of sandy beaches in the Nelson Mandela Bay Municipality (NMBM) was carried out with the aim of describing their type and pollution status. Water salinity, temperature, pH, beach slope, water inorganic nutrient concentrations, urea, and chlorophyll-a concentration as well as the composition of zooplankton, phytoplankton, meiofauna, benthic microalgae and bacteria were examined at thirteen beaches. The beaches were classified into three types: short beaches; long beaches with surf diatoms; and long beaches that import biomass (without surf diatoms). Of t

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Taylor, Geraldine Claire. "Biology and ecology of largemouth bass Micropterus salmoides in two temperate South African impoundments." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001668.

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Globally largemouth bass Micropterus salmoides is one of the most widely introduced game fish species which has now become invasive in many countries. Well researched in its native North America, there are few studies on this species in its introduced range. This study aims to improve the understanding of the biology and ecology of M. salmoides in temperate southern Africa, where it threatens native biota and supports a popular recreational fishery. This aim was addressed by assessing the age, growth, maturity, reproductive seasonality, feeding, mortality and movement, of two M. salmoides popu

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Norton, Olivia Bridget. "The population structure of two estuarine fish species, atherina breviceps (Pisces: Atherinidae) and gilchristella aestuaria (Pisces: Clupeidae), along the Southern African coastline." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005431.

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Phylogeographic patterns of coastal organisms with different life histories and breeding strategies may reveal patterns not consistent with the current delineation of the biogeographic provinces around South Africa. The subdivision of the South African coastline into these three main climatological or biogeographic regions: namely the cool temperate west coast, the warm temperate south coast and the subtropical east coast, is based on average seawater temperatures and hydrological conditions. Genealogies of two estuarine fish species Atherina breviceps, a marine breeder, and Gilchristella aest

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Gama, Phumelele Thuthuka. "Phytoplankton chlorophyll a concentration and community structure in two temporarily open/closed estuaries in the Eastern Cape, South Africa." Thesis, Nelson Mandela Metropolitan University, 2008. http://hdl.handle.net/10948/707.

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River flow is important in controlling phytoplankton distribution in estuaries. Data on the effect of river inflow on phytoplankton distribution patterns in temporarily open/closed estuaries is lacking. This study investigated the influence of river inflow on size-fractionated phytoplankton biomass (Chl a), community composition and environmental parameters measured monthly over three years in two temporarily open/closed estuaries in the Eastern Cape, South Africa. A once-off primary production study over an annual cycle was completed in the Van Stadens and Maitland estuaries. The study monito

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Mmonwa, Kolobe Lucas. "Molecular phylogeny, phylogeography and evolutionary adaptation of foraging behaviour amongst sympatric patellid limpets along the southern African shoreline." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013222.

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The southern African shoreline is inhabited by a great diversity of patellid limpets of which most are endemic to South Africa. These limpets have evolved foraging mechanisms that partition ecological resources and reduce interspecific competition, resulting in ecological specialists and generalists. The evolution of ecological specialization or generalization remains poorly understood and there is no agreement on how such evolutionary transitions are correlated with levels of genetic diversity. This study investigated evolutionary correlations between territoriality in foraging and genetic st

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Bezuidenhout, Chantel. "Macrophytes as indicators of physico-chemical factors in South African Estuaries." Thesis, Nelson Mandela Metropolitan University, 2011. http://hdl.handle.net/10948/1387.

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This study investigated the response of macrophytes to physico-chemical factors in seven South African estuaries and showed that dominant salt marsh species that occur in different estuaries respond to the same environmental factors. The most important variables influencing distribution were elevation, water level, sediment- and groundwater electrical conductivity and depth to the water table. In permanently open estuaries (Kromme and Olifants) transect surveys identified three distinct vegetation zones i.e. submerged macrophytes, intertidal salt marsh and supratidal salt marsh. In the Kromme

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Veldkornet, Dimitri Allastair. "Morphological variation and species diversity of South African Estuarine macrophytes." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1013001.

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Studies on morphological variation are important as it can depict the relationship with environmental factors clearly and convey an understanding of the manner, mechanism and factors influencing plant adaptation and evolution. Although many studies have been conducted on South African salt marsh plant physiology and phytosociology there are at present very few morphological studies on estuarine plants. The aim of this study was to compare the morphological variation of estuarine macrophytes in three different estuary types in the warm temperate biogeographic zone of South Africa and to compare

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Mbense, Sinegugu. "The growth and recovery of mangroves at three South African study sites." Thesis, Nelson Mandela Metropolitan University, 2017. http://hdl.handle.net/10948/11931.

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Mangroves in South Africa are prone to anthropogenic pressures such as browsing and trampling by livestock and by natural disturbances such as drought and floods. These mangroves exist at one of the most southerly limits in the world providing a unique opportunity to study recovery and resilience to change. This study used long term data at three South African study sites located in the subtropical (St Lucia Estuary) and warm temperate regions (Nxaxo and Kobonqaba estuaries) to compare mangrove growth rate, population structure and responses to disturbance. The first objective was investigated

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Oswald, Krista Natasha. "Seasonal physiological responses in the Cape Rockjumper (Chaetops frenatus): a Fynbos endemic bird shows limited capacity to deal with temperature extremes." Thesis, Nelson Mandela Metropolitan University, 2016. http://hdl.handle.net/10948/12994.

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The Fynbos biome in south-western South Africa is a global biodiversity hotspot vulnerable to climate change. Of the six Fynbos-endemic passerines, Cape Rockjumpers (hereafter Rockjumpers; Chaetops frenatus) are most vulnerable to increases in temperature, with population declines correlated with warming, and low physiological heat thresholds. Rockjumper’s preferred mountain habitat is predicted to decrease as they lack opportunity to move to cooler regions as temperatures warm. As Rockjumpers currently occupy the coldest regions of the Fynbos, I hypothesized their thermal physiology would sho

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Harrison, Trevor D. "Ecology of the ichthyofauna in three temporarily open/closed estuaries on the Natal coast." Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1005113.

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The ichthyofauna of three small Natal estuaries, the Mhlanga, Damba and Zotsha was sampled over a period of two years. A total of 68 kinds of fishes representing 24 families, 39 genera and 56 species were captured during this study. Forty seven kinds of fishes were recorded in the Mhlanga of which Gilchristella aestuaria,Oreochromis mossambicus, Valamugil cunnesius, Valamugil sp. and juvenile mugilids numerically dominated. In terms of biomass, O. mossambicus, V. cunnesius, Liza alata, Myxus capensis and Mugil cephalus dominated the ichthyofauna of the Mhlanga. In the Damba, 24 kinds of fishes

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Gilbert, Martin Jeffray. "The ecology of the South African citrus thrips, Scirtothrips aurantii Faure and its economic implications." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1005358.

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The South African Citrus Thrips, Scirtothrips aurantii Faure (Thysanoptera: Thripidae) has been a serious pest of the citrus industry of Southern Africa for over 70 years. It is indigenous to Africa and has no recorded parasitoids and, in most citrus-growing regions, predators are not economically effective. Firstly, in this study, the general ecology of thrips was reviewed along with the recorded history of S. aurantii and its control. Host plant relationships of S. aurantii were then examined and wild hosts were not found to be important in promoting citrus thrips outbreaks in the orchard af

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Van, der Westhuizen Henri. "Valuing preferences for freshwater inflows into the Bira, Bushmans, Kasouga, Keiskamma, Kleinemond East, Nahoon and Tyolomnqa estuaries." Thesis, Nelson Mandela Metropolitan University, 2007. http://hdl.handle.net/10948/628.

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There are about 259 estuaries in South Africa that can be classified as “functioning” and their “health” status is directly related to the quantity and quality of freshwater that flows into them. Many of South Africa’s estuaries have become smaller due to a steady decrease in the amount of freshwater that flows into them. This reduction in freshwater inflows decreases their ecological functioning and undermines the recreational activities and subsistence services available from them. The National Water Act (ACT No. 36 of 1998) recognises the right of the environment to water, but a large amoun

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Walters, Michele. "Seed ecology as a determinant of population structure in some Southern African Savanna Acacia species." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53044.

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Thesis (MScAgric)--Stellenbosch University, 2002.<br>ENGLISH ABSTRACT: African Acacia species are often major contributors to the progressive increase in the woody component of savannas, a phenomenon commonly referred to as bush encroachment. In Hluhluwe- Umfolozi Park, the numbers of adult Acacia nilotica (L.) Willd. Ex Del. trees per hectare far exceed (by III) that of A. karroo Hayne adults. The relative dominance is reversed in the juvenile stage with A. karroo (725 ha') outnumbering A. nilotica (225 ha-I) threefold outside closed woodlands. African acacias produce large quantities o

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Lowman, Guy Russell Pollock. "Deposition of nitrogen to grassland versus forested areas in the vicinity of sabie, Mpumalanga, South Africa." Thesis, University of the Witwatersrand, 2003. http://hdl.handle.net/10539/20112.

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Nitrogen deposition to adjacent grassland and forested areas in the vicinity of Sabie, Mpumalanga, South Africa was studied. Total deposition amounts to the forested area are calculated to be 7l.2 kg N ha-1 yr1 and to the grassland area, 25 kg N ha· 1 yr1. The average deposition amounts are similar to or at least approach nitrogen mineralisation amounts at nearby sites of 50-70 kg N ha-1 yr1. The deposition amounts are made up of 21.4 kg N ha-1 yr1 dry deposition, 7.8 kg N ha-1 yr1 wet deposition and 42 kg N ha-1 yr1 cloud droplet deposition for the forest. For the grassland, the amounts

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