Energetics of Foraging in Breeding Adelie Penguins
We studied foraging energetics in Adelie Penguins (Pygoscelis adeliae) using doubly labeled water (DLW) and time—depth recorders (TDR). Measurements were made during three nesting stages: late incubation, the guard stage (when small chicks were continuously guarded by at least one parent) and the su...
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Language: | English |
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Wiley
1993
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Online Access: | http://dx.doi.org/10.2307/1939596 http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1939596 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1939596 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.2307/1939596 |
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crwiley:10.2307/1939596 2024-09-15T18:31:40+00:00 Energetics of Foraging in Breeding Adelie Penguins Chappell, Mark A. Shoemaker, Vaughan H. Janes, Donald N. Maloney, Shane K. Bucher, Theresa L. 1993 http://dx.doi.org/10.2307/1939596 http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1939596 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1939596 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.2307/1939596 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ecology volume 74, issue 8, page 2450-2461 ISSN 0012-9658 1939-9170 journal-article 1993 crwiley https://doi.org/10.2307/1939596 2024-07-11T04:39:12Z We studied foraging energetics in Adelie Penguins (Pygoscelis adeliae) using doubly labeled water (DLW) and time—depth recorders (TDR). Measurements were made during three nesting stages: late incubation, the guard stage (when small chicks were continuously guarded by at least one parent) and the subsequent creche stage (when large chicks were left unattended). Nest relief cycle times decreased from 229 h during incubation to 33.3 h during the creche stage, and the fraction of time birds spent swimming increased from 20.8% during incubation to 31.6% during the creche stage. The fraction of swim time spent in hunting dives and bottom time did not change significantly at different nesting stages. Field metabolic rates (FMR) wee 2.73 ° basal metabolic rate (BMR) during incubation, 3.03 ° BMR during the guard stage, and 3.29 ° BMR during the creche stage; due to high variance these values did not differ significantly. Estimated metabolic rate during swimming was 8.2 ° BMR. Rates of prey capture (grams of krill per hour of swimming, per hour of hunting dives, and per hour of bottom time) did not change at different stages. Food provided to chicks was 20.9% (guard stage) to 23.3% (creche stage) of the food metabolized by adults. Our data suggest that (1) prey capture by Adelies is limited primarily by their ability to find drill swarms and not by limitations in harvest rates or energy efficiency after prey have been located, and (2) reproductive effort in Adelies does not require a large increase in either energy expenditures or foraging time. Article in Journal/Newspaper Pygoscelis adeliae Wiley Online Library Ecology 74 8 2450 2461 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
We studied foraging energetics in Adelie Penguins (Pygoscelis adeliae) using doubly labeled water (DLW) and time—depth recorders (TDR). Measurements were made during three nesting stages: late incubation, the guard stage (when small chicks were continuously guarded by at least one parent) and the subsequent creche stage (when large chicks were left unattended). Nest relief cycle times decreased from 229 h during incubation to 33.3 h during the creche stage, and the fraction of time birds spent swimming increased from 20.8% during incubation to 31.6% during the creche stage. The fraction of swim time spent in hunting dives and bottom time did not change significantly at different nesting stages. Field metabolic rates (FMR) wee 2.73 ° basal metabolic rate (BMR) during incubation, 3.03 ° BMR during the guard stage, and 3.29 ° BMR during the creche stage; due to high variance these values did not differ significantly. Estimated metabolic rate during swimming was 8.2 ° BMR. Rates of prey capture (grams of krill per hour of swimming, per hour of hunting dives, and per hour of bottom time) did not change at different stages. Food provided to chicks was 20.9% (guard stage) to 23.3% (creche stage) of the food metabolized by adults. Our data suggest that (1) prey capture by Adelies is limited primarily by their ability to find drill swarms and not by limitations in harvest rates or energy efficiency after prey have been located, and (2) reproductive effort in Adelies does not require a large increase in either energy expenditures or foraging time. |
format |
Article in Journal/Newspaper |
author |
Chappell, Mark A. Shoemaker, Vaughan H. Janes, Donald N. Maloney, Shane K. Bucher, Theresa L. |
spellingShingle |
Chappell, Mark A. Shoemaker, Vaughan H. Janes, Donald N. Maloney, Shane K. Bucher, Theresa L. Energetics of Foraging in Breeding Adelie Penguins |
author_facet |
Chappell, Mark A. Shoemaker, Vaughan H. Janes, Donald N. Maloney, Shane K. Bucher, Theresa L. |
author_sort |
Chappell, Mark A. |
title |
Energetics of Foraging in Breeding Adelie Penguins |
title_short |
Energetics of Foraging in Breeding Adelie Penguins |
title_full |
Energetics of Foraging in Breeding Adelie Penguins |
title_fullStr |
Energetics of Foraging in Breeding Adelie Penguins |
title_full_unstemmed |
Energetics of Foraging in Breeding Adelie Penguins |
title_sort |
energetics of foraging in breeding adelie penguins |
publisher |
Wiley |
publishDate |
1993 |
url |
http://dx.doi.org/10.2307/1939596 http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1939596 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1939596 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.2307/1939596 |
genre |
Pygoscelis adeliae |
genre_facet |
Pygoscelis adeliae |
op_source |
Ecology volume 74, issue 8, page 2450-2461 ISSN 0012-9658 1939-9170 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.2307/1939596 |
container_title |
Ecology |
container_volume |
74 |
container_issue |
8 |
container_start_page |
2450 |
op_container_end_page |
2461 |
_version_ |
1810473424002220032 |