Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"Rocky Shore"”.
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Shellfish utilization and its effect on rocky shore biota in Transkei
The shellfish on the rocky shores along the Transkei coast experience intense exploitation from three different sources viz. commercial exploitation, tourist - induced exploitation and continued regular harvesting by the indigenous people. The question raised as a result of these combined factors …
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The contribution by phytoplankton, bacteria and detritus to a rocky shore ecosystem
… and chlorcphyll a were highest at the offshore edge of the reef in incoming water. After a strong south-easterly win:i, chlorophyll concentrations of 19 µg/1 were rerorded O, 5 km offshore. Chlorophy 11 concentrations were in the region of 5 µg/1 in winter. Detritus accounted for aln'Ost …
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The population ecology and feeding biology of rocky shore crabs on the Cape Peninsula
… is the population ecology and feeding biology of rocky-shore crabs on the Cape Peninsula. The biology of three crabs is examined, namely, the ubiquitous brown shore-crab Cyclograpsus punctatus (M.Edw), the Cape rock-crab Plagusia chabrus (De Haan) and the invasive European shore-crab Carcinus …
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The effectiveness of Table Mountain National Park Marine Protected Area in the conservation of rocky shore biodiversity
… MPA in protecting the biodiversity of intertidal rocky shores. Surveys were conducted to compare (1) the densities and sizes of exploited species and rarely harvested species, and (2) community composition, between these two levels of protection. Some clear patterns emerged. Firstly, notake areas …
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The interactive effects of disturbance and nutrient enrichment on species diversity and biomass of intertidal rocky-shore communities
Unimodal patterns of diversity along gradients of both disturbance and productivity rank amongst the most celebrated generalizations in ecology, known as the Intermediate Disturbance Hypothesis (IOH) and Productivity Diversity Hypothesis. However, doubt about their generality has arisen from …
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Significant Population Structure and Little Connectivity in South African Rocky Shore Species: Implications for the Conservation of Regional Marine Biodiversity
… mitochondrial DNA sequence data for 10 sessile rocky-shore species and one reef-fish that represent three distinct life history strategies. We find that the distribution of genetic diversity across the South African coastline closely mirrors the distribution of species richness, increasing from …
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Spatial and temporal variations in rocky intertidal communities
… in terms of spatial and seasonal variations in rocky shore communities and falls into two distinct parts: 1. A general survey of intertidal conditions and an investigation of the interactions of certain physical factors on rocky shore communities. 2. An investigation of seasonal changes in the …
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Ciclo reprodutivo, gametogênese e desenvolvimento larval de Asterina stellifera (Möbius, 1859) (Echinodermata: Asteroidea) na região de Cabo Frio, RJ
… lsland ( 1994-1995); the second is a sublittoral rocky-shore at Pontal Beaches ( 1999-2000). Development pattern was described based on laboratory cultures. Reproductive cycle was studied at monthly intervals by organ indices and histological examinations of gonads. A. stellifera has a typical …
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Ecological and biogeographical studies on the rocky shore seagrass Thalassodendron ciliatum (Forsskal) den Hartog and its seaweed epiphytes at the southern limit of its distribution in the western Indian Ocean by Catherine Margot Browne.
… diversity and biogeography of the South African rocky shore seagrass Thalassodendron ciliatum and its associated macroalgal epiphytes. Seagrass populations were sampled at Jesser Point (Sodwana Bay) and at Maphelane, the former being larger and the southernmost populations observed, and the …
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Tropic interactions within South African intertidal mussel beds
Community structure of intertidal rocky shore mussel beds has been previously shown to be strongly influenced by trophic interactions, particularly interactions between predators of mussels and their prey. This investigation involved, firstly, construction of models to simulate trophic interactions …
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Biology and ecological energetics of the supralittoral isopod Ligia dilatata
… dynamics and energetics of the supralittoral rocky shore kelp-eating isopod Ligia dilatata Brandt.
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Patterns and causes of intertidal community structure around the coast of Southern Africa
… was undertaken using data for intertidal rocky-shore communities obtained from quantitative biological surveys made around the southern African coast. Substantial differences in species composition, abundance and trophic structure were found between 15 different rocky shores along ca. 5000 …
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Marine alien species of South Africa : threats and opportunities
… 40 km west of East London. Along South African shores a total stock of 35 403.7 tons (± 7 241.4 SE) was recorded, with the vast majority of the stock occurring on the west coast (31 054.5 tons ± 6 274.1 SE). C. maenas supports a substantial population of 133 568 individuals (95 % confidence …
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Distribution, diet and kleptoparasitic behaviour of gulls (Aves: Laridae) in the southwestern Cape Province, South Africa
… of foraging habitats; (i) a sandy beach; (ii). a rocky shore; (iii) a fishing harbour; and, (iv) a refuse dump. In addition, the proportion of marine prey in the diet of Kelp Gulls at a refuse dump, a sandy beach and at archaeological sites was estimated using stable carbon isotope analysis of …
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Tipping points, regime shifts and species interactions within shallow marine ecosystems
… which pressure may be more important on rocky shore boulder systems in the south of England. Surveys at mid tide level demonstrated three systems were present on multiple shores, those dominated by green algae, those dominated by barnacles and those dominated by brown algae. Grazer number …
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Human impact on the biodiversity of macroinvertebrates in intertidal rocky shores along the Namibian coast
The intertidal rocky shores along the central coast of Namibia provide multiple microhabitats supporting a high species biodiversity and a unique heterogeneous environment. Extreme anthropogenic disturbance such as harvesting and trampling due to human visitors may reduce biodiversity, modifying …
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Rocky Shores: From Habitat Threat to Marine Awareness & Well-Being Benefits
… benefits to the human visitors in the context of rocky shores (intertidal areas where solid rock predominates). This was investigated using seven studies that involved a range of methods. Perception-based surveys (Studies 1 & 2) explored the perceived impacts on the visitor, and the potential …
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The role of macroalgal morphology and community structure on the accumulation of sediment and the subsequent effects on the dynamics of marine intertidal communities
… cover on intertidal community structure.Three shores on the North Yorkshire coast, England, were used to investigate differences in the quantity of sediment trapped by ten morphologically different algal species, and the relationship between morphology and the quantity of sediment trapped. The …
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Biochemical and morphological systematics of the Southern African gastropod genera Burnupena (Buccinidae) and Oxystele (Trochidae)
Gastropods of the genus Burnupena are very common rocky-shore whelks endemic to the Southern African region. However, despite recent revisions of the genus, difficulties in identification persist, due mainly to the occurrence of phenotypic intermediates between sympatric species. Samples of …
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