Physiological condition and reproductive consequences in Adelie penguins
SYNOPSIS. Animals must make ‘‘decisions’ ’ (e.g., when or whether to breed, the effort to put into a breeding episode) by integrating physiological, environmental and social inputs. This integration can be studied only in a field context. In Adélie penguins (Pygoscelis adeliae) reproduction is cons...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.557.4450 2023-05-15T18:03:50+02:00 Physiological condition and reproductive consequences in Adelie penguins Carol M. Vleck David Vleck The Pennsylvania State University CiteSeerX Archives 2002 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.557.4450 http://www.public.iastate.edu/~cvleck/pdf/2002ICB.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.557.4450 http://www.public.iastate.edu/~cvleck/pdf/2002ICB.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.public.iastate.edu/~cvleck/pdf/2002ICB.pdf text 2002 ftciteseerx 2016-01-08T11:50:41Z SYNOPSIS. Animals must make ‘‘decisions’ ’ (e.g., when or whether to breed, the effort to put into a breeding episode) by integrating physiological, environmental and social inputs. This integration can be studied only in a field context. In Adélie penguins (Pygoscelis adeliae) reproduction is constrained by foraging ecology, mode of transport, and the extreme latitude at which they live. The decision whether to breed in a given year is influenced by body conditions. Adélie penguins must fast for several weeks during the early repro-ductive stages and use stored fat for metabolic energy. Females that return to the colony, but do not breed, are 10–12 % lighter than females that do breed. Birds that are relatively low in body mass tend to have lower reproductive success than heavier birds, and an individual’s reproductive success is positively corre-lated with the body fat stores it had on arrival. After eggs are laid, parents alternate in attending the nest. Nest failure occurs if one parent does not make a timely return and its fasting partner must eventually leave. During normal-length fasts plasma corticosterone and glucose levels do not change. Blood b-hydroxy-butyrate levels gradually increase during the fast while uric acid levels remain low, but in birds with the longest fasts (.;50 days), ketone levels may fall and uric acid levels increase, indicative of a switch from using fat to using body proteins for metabolism. In incubating males, hematocrit and hemoglobin concen-trations also increase, suggesting dehydration can accompany energy stress during the breeding fast. Text Pygoscelis adeliae Unknown |
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English |
description |
SYNOPSIS. Animals must make ‘‘decisions’ ’ (e.g., when or whether to breed, the effort to put into a breeding episode) by integrating physiological, environmental and social inputs. This integration can be studied only in a field context. In Adélie penguins (Pygoscelis adeliae) reproduction is constrained by foraging ecology, mode of transport, and the extreme latitude at which they live. The decision whether to breed in a given year is influenced by body conditions. Adélie penguins must fast for several weeks during the early repro-ductive stages and use stored fat for metabolic energy. Females that return to the colony, but do not breed, are 10–12 % lighter than females that do breed. Birds that are relatively low in body mass tend to have lower reproductive success than heavier birds, and an individual’s reproductive success is positively corre-lated with the body fat stores it had on arrival. After eggs are laid, parents alternate in attending the nest. Nest failure occurs if one parent does not make a timely return and its fasting partner must eventually leave. During normal-length fasts plasma corticosterone and glucose levels do not change. Blood b-hydroxy-butyrate levels gradually increase during the fast while uric acid levels remain low, but in birds with the longest fasts (.;50 days), ketone levels may fall and uric acid levels increase, indicative of a switch from using fat to using body proteins for metabolism. In incubating males, hematocrit and hemoglobin concen-trations also increase, suggesting dehydration can accompany energy stress during the breeding fast. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Carol M. Vleck David Vleck |
spellingShingle |
Carol M. Vleck David Vleck Physiological condition and reproductive consequences in Adelie penguins |
author_facet |
Carol M. Vleck David Vleck |
author_sort |
Carol M. Vleck |
title |
Physiological condition and reproductive consequences in Adelie penguins |
title_short |
Physiological condition and reproductive consequences in Adelie penguins |
title_full |
Physiological condition and reproductive consequences in Adelie penguins |
title_fullStr |
Physiological condition and reproductive consequences in Adelie penguins |
title_full_unstemmed |
Physiological condition and reproductive consequences in Adelie penguins |
title_sort |
physiological condition and reproductive consequences in adelie penguins |
publishDate |
2002 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.557.4450 http://www.public.iastate.edu/~cvleck/pdf/2002ICB.pdf |
genre |
Pygoscelis adeliae |
genre_facet |
Pygoscelis adeliae |
op_source |
http://www.public.iastate.edu/~cvleck/pdf/2002ICB.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.557.4450 http://www.public.iastate.edu/~cvleck/pdf/2002ICB.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766174843976286208 |