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 70 for “"penguin"”.
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Remote Sensing of Antarctic Penguin Populations
Penguins, high trophic-level predators almost exclusively confined to the Southern Ocean, are believed to be particularly susceptible to the unprecedented climatic changes that are currently being experienced in the region. Indeed, the two species of interest to this research, the chinstrap and …
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Fine-scale drivers of African Penguin prey dynamics in Algoa Bay, South Africa, and their impacts on penguin foraging ecology
African Penguins (Spheniscus demersus) have undergone a dramatic decrease in their population since the turn of this century prompting the up-grading of their conservation status to 'endangered'. There is growing evidence that variation in the availability of their principle prey, pelagic shoaling …
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The African penguin Spheniscus demersus : conservation and management issues
The African penguin is a southern African endemic, with its breeding distribution within the Benguela Upwelling Ecosystem. The IUCN conservation status of this species was re-classified from ‘Vulnerable’ to ‘Endangered’ in 2010. This thesis investigated some aspects pertinent to the species’ …
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The ecstatic display call of the Adélie penguin (Pygoscelis adeliae)
… the focus of study for many years. The Adélie penguin (Pygoscelis adeliae) breeds in vocally challenging Antarctic colonies and has evolved a complex system of intra- and intersexual visual and vocal behaviours. Unique to the Adélie penguin, is the presence of two distinct display calls, the …
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Remote sensing of penguin populations: Development and application of a satellite-based method
Five penguin species breed in Antarctica: emperors, Adélies, chinstraps, gentoos and macaronis. These are important Antarctic mid-trophic level predators and under predicted climate change are believed threatened. Accurate monitoring of populations is therefore of growing importance owing to the …
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Plasticity and partitioning of foraging behaviour among and within sympatric Pygocelis penguin populations
… In the Southern Ocean, sympatrically breeding penguin species often have overlapping foraging ranges and niches that may lead to competition. Interspecific (between species) and intraspecific (within species) competition are important processes that may shape the foraging behaviours of …
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The threat of terrestrial predators to mainland penguin colonies: searching for sustainable solutions
… facto apex predator. Overexploitation of Africa penguins (Spheniscus demersus), their prey and their island breeding sites in the south-western Cape resulted in a rapid decline in the African penguin population and a shift in their distribution. This shift coincided with the establishment of at …
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Valuing an ecotourism resource : a case study of the Boulders Beach African penguin colony
The colony of African Penguins at Boulders, Simon's Town on the southern Cape Peninsula, Western Cape formed in 1985, and is now a major ecotourism destination. The African Penguin is listed as Endangered due in part to competition with commercial fisheries. Improvements in the spatial management …
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Foraging ecology of the African Penguin Spheniscus demersus in relation to ocean physical processes.
… augments our knowledge base of the African Penguins foraging ecology. African Penguins show flexibility in their foraging behaviour by adjusting their dive behaviour to subsurface thermal structures. Penguins also demonstrated foraging optimization by using temperature cues and behavioral …
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‘The Bridge’: How The Penguin New Writing (1940-1950) shaped twentieth-century responses to China
… and British writers published in the journal The Penguin New Writing (1940-1950). The writers were responding to a traumatic period in history spanning part of the Second Sino-Japanese War and World War II and its aftermath. TPNW, promoted contemporary writing from around the world and was open …
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Comparative breeding biology of the Northern Rockhopper penguin Eudyptes moseleyi on Gough and Nightingale Islands
The Northern Rockhopper Penguin Eudyptes moseleyi is listed as Endangered due to an estimated 57% decrease in breeding numbers over the past 37 years. Approximately 85% of the global population breeds at the Tristan da Cunha archipelago (Tristan, Inaccessible and Nightingale Islands) and nearby …
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Human-animal interaction in the Antarctic: an animal behaviour approach to human disturbance of penguin colonies
Human disturbance of Antarctic penguins is an important aspect of Antarctic conservation. It is a phenomenon which has raised concern for several decades, and has prompted the creation of guidelines for human behaviour which aim to minimise disturbance to these and other Antarctic animals. …
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Robben Island penguin pressure model: a decision support tool for an ecosystems approach to fisheries management
The African penguin (Spheniscus demersus) population in southern Africa has declined from approximately 575 000 adults at the start of the 20th century to 180 000 adults in the early 1990s. The population is still declining, leading to the International Union for the Conservation of Nature …
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An assessment of the use of the Jackass penguin as a sampler of the marine environment
In this thesis the use of the jackass penguin Spheniscus demersus as a sampler of the marine environment is assessed. Between February 1987 and July 1988, 638 monthly diet samples were obtained from adult jackass penguins at west - (Marcus and Jutten Islands) and southwest-coast (Dyer Island) …
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African penguin (Spheniscus demersus) distribution during the non-breeding season : preparation for, and recovery from, a moulting fast
… the spatial ecology of the endangered African penguin during the non-breeding season. As foraging success during this period is critical to adult survival, this project explores their dispersal patterns, as well as the degree of overlap with commercial purse-seine fisheries which target the …
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Using seasonal mass-balanced models of the Algoa Bay ecosystem to investigate African penguin and small pelagic fish interactions
… largest breeding colony of endangered African penguins (Spheniscus demersus). The breeding success of African penguins is largely dependent on the availability of their food, mainly anchovy (Engraulis encrasicolus) and sardine (Sardinops sagax). African penguins breed year-round however, peak …
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Disease in Spheniscus penguins: Feather-loss disorder and Avian Pox
… feather-loss disorder affect Spheniscus penguins. Avian pox is an enveloped doublestranded DNA virus that is mechanically transmitted via arthropod vectors or mucosal membrane contact with infectious particles or birds. Avian pox outbreaks primarily affected chicks, often resulted in …
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Penguins and purse-seiners : competition or co-existence?
… the pelagic purse-seine fishery and Jackass penguins (Spheniscus demersus) were investigated at Saldanha Bay, on the south-western coast of South Africa, between December 1982 and August 1983. The distribution at sea and the foraging behaviour of Jackass Penguins were examined by running …
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Feeding biology and energetics of King Aptenodytes patagonicus and Gentoo Pygoscelis papua Penguins at sub-Antarctic Marion Island
Adaptations of penguins for pursuit diving have resulted in reduced foraging ranges, compared to volant seabirds. However, their classification as inshore, offshore or pelagic foragers, based on rates of food provisioning to chicks, still has merit as a framework around which aspects of their …
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