Ecological energetics of Eudyptes penguins at Marion Island
Includes bibliographies. 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 requirem...
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Language: | English |
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University of Cape Town
1987
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Online Access: | http://hdl.handle.net/11427/7594 https://open.uct.ac.za/bitstream/11427/7594/1/thesis_sci_1987_brown_cr.pdf |
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ftunivcapetownir:oai:localhost:11427/7594 2023-05-15T13:54:58+02:00 Ecological energetics of Eudyptes penguins at Marion Island Brown, Christopher Raymond Siegfried, W R 1987 application/pdf http://hdl.handle.net/11427/7594 https://open.uct.ac.za/bitstream/11427/7594/1/thesis_sci_1987_brown_cr.pdf eng eng University of Cape Town Faculty of Science Percy FitzPatrick Institute of African Ornithology http://hdl.handle.net/11427/7594 https://open.uct.ac.za/bitstream/11427/7594/1/thesis_sci_1987_brown_cr.pdf Zoology Doctoral Thesis Doctoral PhD 1987 ftunivcapetownir 2022-09-13T05:50:58Z Includes bibliographies. 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. Doctoral or Postdoctoral Thesis Antarc* Antarctic Eudyptes chrysolophus Marion Island University of Cape Town: OpenUCT Antarctic |
institution |
Open Polar |
collection |
University of Cape Town: OpenUCT |
op_collection_id |
ftunivcapetownir |
language |
English |
topic |
Zoology |
spellingShingle |
Zoology Brown, Christopher Raymond Ecological energetics of Eudyptes penguins at Marion Island |
topic_facet |
Zoology |
description |
Includes bibliographies. 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. |
author2 |
Siegfried, W R |
format |
Doctoral or Postdoctoral Thesis |
author |
Brown, Christopher Raymond |
author_facet |
Brown, Christopher Raymond |
author_sort |
Brown, Christopher Raymond |
title |
Ecological energetics of Eudyptes penguins at Marion Island |
title_short |
Ecological energetics of Eudyptes penguins at Marion Island |
title_full |
Ecological energetics of Eudyptes penguins at Marion Island |
title_fullStr |
Ecological energetics of Eudyptes penguins at Marion Island |
title_full_unstemmed |
Ecological energetics of Eudyptes penguins at Marion Island |
title_sort |
ecological energetics of eudyptes penguins at marion island |
publisher |
University of Cape Town |
publishDate |
1987 |
url |
http://hdl.handle.net/11427/7594 https://open.uct.ac.za/bitstream/11427/7594/1/thesis_sci_1987_brown_cr.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Eudyptes chrysolophus Marion Island |
genre_facet |
Antarc* Antarctic Eudyptes chrysolophus Marion Island |
op_relation |
http://hdl.handle.net/11427/7594 https://open.uct.ac.za/bitstream/11427/7594/1/thesis_sci_1987_brown_cr.pdf |
_version_ |
1766261175310352384 |