Ecological energetics of Eudyptes penguins at Marion Island

 

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dc.contributor.advisor Siegfried, W R en_ZA
dc.contributor.author Brown, Christopher Raymond en_ZA
dc.date.accessioned 2014-09-22T07:53:19Z
dc.date.available 2014-09-22T07:53:19Z
dc.date.issued 1987 en_ZA
dc.identifier.citation Brown, C. 1987. Ecological energetics of Eudyptes penguins at Marion Island. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/7594
dc.description Includes bibliographies. en_ZA
dc.description.abstract 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 during their respective breeding and moulting cycles at the island. Resting metabolic rates, calculated from lowest, stable rates of oxygen consumption over 24 h, averaged 25 % greater than basal metabolic rates predicted from allometric equations. Body temperatures of the penguins and the relationships between metabolic rates and temperature were investigated over a range of -10°C to 25°C. Lower critical temperature of Rockhopper Penguins was between 0°C and 5°C, but that of Macaroni Penguins could not be clearly ascertained. Measured metabolic rates of other species of penguins are reviewed and intra- and inter-specific differences in metabolic rates are discussed. In contrast to most penguins measured, individuals maintained in zoos or held in captivity for long periods had metabolic rates lower than predicted basal levels. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Zoology en_ZA
dc.title Ecological energetics of Eudyptes penguins at Marion Island en_ZA
dc.type Thesis / Dissertation en_ZA
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Percy FitzPatrick Institute of African Ornithology en_ZA
dc.type.qualificationlevel Doctoral en_ZA
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image


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