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 65 for “"penguins"”.
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Breeding Jackass Penguins as pelagic predators
The foraging of breeding Jackass Penguins Spheniscus demersus was studied in and around southwestern Cape Province, Saldanha Bay (33⁰ S, 18⁰ E), South Africa. Penguins are difficult to observe at sea. Hence, I devised a number of new techniques for studying the foraging behaviour of Jackass …
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Breeding behavior of captive emperor penguins (Aptenodytes forsteri)
<p>Breeding behavior of captive Emperor Penguins (Aptenodytes forsteri) was observed at Sea World, San Diego, California during July, August, and September 1980, and April 1981. Emphasis was on displays, courtship, egg-laying, incubation, and care of chicks.</p> <p>I observed the trumpet display …
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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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Ecological energetics of Eudyptes penguins at Marion Island
Macaroni Penguins (Eudyptes chrysolophus) and Rockhopper Penguins (E. chrysocome) breed sympatrically at Marion Island in the sub-Antarctic, where they account for a substantial proportion of the avian biomass breeding at the island. This thesis documents the energy requirements of the two species …
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Survival and movements of African Penguins, especially after oiling
Bibliography: p. 273-286.
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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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Influence of ecosystem variability on the demography and reproductive performance of two Eudyptes penguins, Macaroni and Eastern Rockhopper Penguins, at sub-Antarctic Marion Island, 1994–2019
Penguins are among the most important avian predators in the Southern Ocean, consuming large amounts of prey. Macaroni Penguins Eudyptes chrysolophus and Eastern Rockhopper Penguins E. filholi are listed as Vulnerable due to large-scale population declines across their distributions. The aim of my …
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Prevalence and drivers of blood parasitism in African penguins (Spheniscus demersus)
… of penguin populations. While parasitism of wild penguins has been poorly studied, susceptibility to infection with blood protozoa is well established in a wide range of penguin species held in captivity. This thesis assesses the prevalence of blood parasites in wild African penguins throughout …
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The effects of incubation manipulation on prolactin secretion in Adélie penguins (Pygoscelis adeliae)
… such an experiment on free-living Adélie penguins (Pygoscelis adeliae), an offshore feeding seabird with biparental care of semi-altricial young which breeds in the harsh environment of Antarctica. We also measured prolactin levels in male Adélie penguins that lost their eggs during …
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A preliminary investigation into effects of flipper banding on African penguins spheniscus demersus
… bands may negatively impact the welfare of penguins. While studies on the impact of banding have been undertaken for several penguin species, no such study has investigated the exclusive effect of banding on African Penguins Spheniscus demersus. I do so by comparing the difference in yearly …
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Comparative foraging ecology of macaroni and rockhopper penguins at the Prince Edward Islands
Penguins are one of the largest consumers of marine resources in the Southern Ocean and spend most of their lives at sea. Although the last four decades have seen technological advancements that have considerably expanded our knowledge about their at-sea behaviour, there is still much to be …
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The breeding biology of Eudyptes penguins with particular reference to egg-size dimorphism
The breeding biology of Macaroni Penguins Eudyptes chrysolophus and of Rockhopper Penguins E. chrysocome was studied at Marion Island (46°54'8, 37°45'E) in the austral summers of 1974-75 and 1976-77. The clutch comprises two eggs, the first-laid (A-) egg being markedly smaller than the second-laid …
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Factors impacting the breeding success of African penguins Spheniscus demersus on Robben Island
… potential to affect breeding success of African penguins; body mass at the onset of breeding and the suitability of various nest types to mitigate changing climatic conditions. Body mass was measured by recording weights using an automated weighing scale set up in front of a nest. Weights were …
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Molecular surveillance for known and novel pathogens in Humboldt penguins (Spheniscus humboldti) in Peru
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01
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The role of penguins in the Recycling of Trace Metals in Antarctica and their Ecological Impact
… in the Antarctic ecosystem, the role of penguins, one of the most emblematic organisms of the region, in the biogeochemical cycles of the Southern Ocean has not been addressed. The central axis of this Doctoral Thesis is the study of guano from two Antarctic penguin species, involving a …
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Factors influencing the foraging behaviour of African Penguins (Spheniscus demersus) provisioning chicks at Robben Island, South Africa
… to halt the declines of endangered African Penguins. A purse-seine fisheries closure zone was in place out to 20 km around Robben Island for three years. It provided an opportunity to investigate penguin foraging behaviour in relation to estimated local prey abundance and other factors …
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Aggressive behavior of female and male magellanic penguins (spheniscus magellanicus) nesting at San Francisco Zoo, San Francisco, California
… in a breeding colony of 44 adult magellanic penguins (MPs) during their nesting season at San Francisco Zoo (SFZ). We sampled their behavior for a total of 149.5 hrs in 46 sessions of 195 min each, all starting at 0945 hrs and stopping at 1300 hrs. We recognized 4 types of AMs, of which 2 …
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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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