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 intertidal"”.
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Spatial and temporal variations in rocky intertidal communities
This thesis attempts to give an understanding of intertidal conditions in the Cape Peninsula 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 …
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Avian determinants of rocky intertidal community structure in South Africa
Rocky islands in Saldanha Bay, southwestern Cape, South Africa, support aggregations of seabirds. Guano produced by the seabirds washed off the islands into intertidal and nearshore waters,where it provides a source of inorganic and organic nutrients. The concentrations of nutrients in intertidal …
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Aspects of ecology and algal physiology in Hawaii's rocky intertidal zones
Intertidal zones are vulnerable to anthropogenic impacts that result from human populations concentrated near coastal waters and while the impact on temperate rocky intertidal systems is much studied, comparatively less is known about these habitats in the tropics. To bolster knowledge and …
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Measuring and Forecasting Environmental Conditions From the Perspective of Rocky Intertidal Organisms
<p>Marine intertidal organisms live in a habitat that is characterized by acute environmental gradients determined by tides, waves, and weather. Models that incorporate these parameters can be used to predict and understand the distributions of organisms on both local and latitudinal scales. …
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Benthic-pelagic coupling : rocky intertidal communities and nearshore oceanographic conditions across multiple scales
… Chapter 1, I characterize geographic patterns in rocky intertidal communities across 6° of latitude along the west coast of South Africa and examine the spatial structure of functional group biomass in relation to wave action and upwelling intensity. Despite between-habitat differences in biomass, …
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An Analysis of Human Disturbance to Rocky Intertidal Communities of San Luis Obispo County
… <p>An Analysis Of Human Disturbance To Rocky Intertidal Communities Of San Luis Obispo County</p> <p>Grant Tyler Waltz</p> <p>The number of coastal areas open to public access in California and San Luis Obispo County is increasing due to the acquisition by California State Parks of land …
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A hierarchical analysis of abiotic determinants and harvesting impacts in the rocky intertidal communities of KwaZulu-Natal
… planning for the previously scarcely studied rocky intertidal habitats in KwaZulu-Natal on the east coast of South Africa. Biogeographic patterns were resolved and abiotic determinants and harvesting impacts were identified at three different scales. A biotope classifiadion system was …
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Ecology of chemical defenses of algae against the herbivorous snail, Littorina littorea, in the New England rocky intertidal community
In the New England rocky intertidal community, space is dominated by two perennial plant types, brown fucoid algae (Ascophyllum nodosum and several species of Fucus) in the mid zones and the red alga Chondrus crispus in the low zones. These algae are not grazed by the predominant herbivorous snail, …
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Vertical zonation of three species of California limpets (Acmaeidae) as a function of predation
… scutum inhabit different vertical zones in the rocky-intertidal region. At Sunset Bay, Oregon, Shotwell (1950) found that C. digitalis was situated in the upper intertidal C. pelta inhabited the mid-intertidal and N. scutum was located in the mid to lower zone in the rocky-intertidal region. …
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An investigation of genetic variation within northwest Atlantic Porphyra (Bangiales, Rhodophyta) with specific phylogeographic analysis of the common, rocky intertidal species, Porphyra umbilicalis
<p>To investigate the phylogeography of the rocky intertidal red alga, Porphyra umbilicalis Kutzing, a restriction fragment polymorphism assay (RFLP) of the ribulose bisphosphate carboxylase large subunit ( rbcL) was developed to accurately distinguish P. umbilicalis from the other morphologically …
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Quantitative approaches and applications to the sequence stratigraphy and biodiversity of Pleistocene – Holocene mollusk communities from the Po plain, Italy and San Salvador Island, the Bahamas
… one focuses on the preservation potential of rocky intertidal environments. The rocky intertidal zone is one of the most poorly preserved fossil-rich environments in the geological record. However in most coastal marine habitats today, it is one of the most diversity rich environments. Chapter …
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The utilization of littoral and estuarine habitats by fish in the Southwestern Cape
This thesis examines the utilization of rocky intertidal, sandy-beach surf-zone and estuarine habits by fishes on the southwestern Cape coast of South Africa. It has there central objectives: 1) to determine the species composition, abundance, size structure and seasonality of fish and to examine …
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Reproductive ecology of the California sea mussel, Mytilus californianus Conrad
… was chosen because it is an important species in rocky intertidal communities (being the most abundant if not the most conspicuous) and forms the basis for diverse associations of numerous other species. The reproductive cycle, larval development to settlement, comparisons of reproduction in high …
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Impacts of the introduced crabs, Carcinus maenas and Hemigrapsus sanguineus, in northern New England
… to predict the impacts of H. sanguineus on the rocky intertidal community of northern New England.</p><p>The temporal and spatial patterns of C. maenas' recruitment were documented in anticipation that this species may decline as H. sanguineus' population increases. Microcosm experiments …
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Some aspects of mercury accumulation by the purple shore crab Hemigrapsus nudus Dana (Crustacea: decapoda)
… the purple shore crab, Hemigrapsus nudus. This rocky intertidal denizen is found in abundance along the entire Pacific coast of the United States from Sitka, Alaska, to the Gulf of California where it dominates the mid-tide pool region. Local specimens were collected just north of the Pacific …
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The synecology of dense assemblages of the deposit-feeding Polychaete, Axiothella rubrocincta (Maldanidae)
… the realized niches of species in marine rocky intertidal (ie Connell 1961, Paine 1966,, Dayton 1971) and terrestrial (i.e~ Harper 1969, Pianka 1973, Cody 1974) communities. In contrast, such interactions have not been clearly demonstrated as determinants of the distribution and abundance …
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The role of a circalunar clock in speciation
… C. marinus is a marine midge inhabiting rocky intertidal zones along the European coast, notable for timing its development and reproduction to the lunar cycle via an endogenous clock. On the northern coast of Brittany, France populations have recently diverged into several sympatric …
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Changing Tides: sculpting heterogeneity through exposing and submerging form in tidal pool design
… systems and ecological interactions of the intertidal landscape. The tidal pool sits at this intersection of land and water, known as the intertidal zone. They are site specific social spaces where people can interact with marine life and they are valuable public places that can connect …
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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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Patterns of distribution, abundance and community composition of rock pool fishes in Goukamma Nature Reserve, South Africa
Rock pools can be found in most rocky intertidal marine environments across the globe. Despite the vast body of literature describing the organization of ecological communities and biota inhabiting the greater rocky intertidal, very little effort has been given to rock pools. As a result they are …
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