Characterizing the nutritional strategy of incubating king eiders Somateria spectabilis in northern Alaska
We measured plasma concentrations of variables associated with lipid metabolism (free fatty acids, glycerol, triglyceride, and β‐hydroxybutyrate), protein metabolism (uric acid), and baseline corticosterone to characterize the nutritional state of incubating king eiders Somateria spectabilis and rel...
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crwiley:10.1111/j.1600-048x.2008.04442.x 2024-03-24T09:05:13+00:00 Characterizing the nutritional strategy of incubating king eiders Somateria spectabilis in northern Alaska Bentzen, Rebecca L. Powell, Abby N. Williams, Tony D. Kitaysky, Alexander S. 2008 http://dx.doi.org/10.1111/j.1600-048x.2008.04442.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1600-048X.2008.04442.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1600-048X.2008.04442.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Avian Biology volume 39, issue 6, page 683-690 ISSN 0908-8857 1600-048X Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2008 crwiley https://doi.org/10.1111/j.1600-048x.2008.04442.x 2024-02-28T02:15:31Z We measured plasma concentrations of variables associated with lipid metabolism (free fatty acids, glycerol, triglyceride, and β‐hydroxybutyrate), protein metabolism (uric acid), and baseline corticosterone to characterize the nutritional state of incubating king eiders Somateria spectabilis and relate this to incubation constancy at two sites, Kuparuk and Teshekpuk, in northern Alaska. King eiders at both sites appeared to employ a partial‐income incubation strategy, relying on both endogenous and exogenous energy resources. Females maintained high invariant levels of free fatty acids, β‐hydroxybutyrate, and glycerol throughout incubation, indicating that fat reserves were a major energy source, and not completely depleted during incubation. Similarly, uric acid did not increase, suggesting effective protein sparing or protein ingestion and adequate lipid reserves throughout incubation. Baseline corticosterone and triglyceride levels increased during incubation, indicative of an increase in foraging during late stages of incubation. Incubating females at Kuparuk had higher triglyceride concentrations but also had higher β‐hydroxybutyrate concentrations than females at Teshekpuk. This dichotomy may reflect a short‐term signal of feeding overlaying the longer‐term signal of reliance on endogenous lipid reserves due to higher food intake yet higher metabolic costs at Kuparuk because of its colder environment. Incubation constancy was not correlated with plasma concentrations of lipid or protein metabolites. Article in Journal/Newspaper Somateria spectabilis Alaska Wiley Online Library Journal of Avian Biology 39 6 683 690 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Bentzen, Rebecca L. Powell, Abby N. Williams, Tony D. Kitaysky, Alexander S. Characterizing the nutritional strategy of incubating king eiders Somateria spectabilis in northern Alaska |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
We measured plasma concentrations of variables associated with lipid metabolism (free fatty acids, glycerol, triglyceride, and β‐hydroxybutyrate), protein metabolism (uric acid), and baseline corticosterone to characterize the nutritional state of incubating king eiders Somateria spectabilis and relate this to incubation constancy at two sites, Kuparuk and Teshekpuk, in northern Alaska. King eiders at both sites appeared to employ a partial‐income incubation strategy, relying on both endogenous and exogenous energy resources. Females maintained high invariant levels of free fatty acids, β‐hydroxybutyrate, and glycerol throughout incubation, indicating that fat reserves were a major energy source, and not completely depleted during incubation. Similarly, uric acid did not increase, suggesting effective protein sparing or protein ingestion and adequate lipid reserves throughout incubation. Baseline corticosterone and triglyceride levels increased during incubation, indicative of an increase in foraging during late stages of incubation. Incubating females at Kuparuk had higher triglyceride concentrations but also had higher β‐hydroxybutyrate concentrations than females at Teshekpuk. This dichotomy may reflect a short‐term signal of feeding overlaying the longer‐term signal of reliance on endogenous lipid reserves due to higher food intake yet higher metabolic costs at Kuparuk because of its colder environment. Incubation constancy was not correlated with plasma concentrations of lipid or protein metabolites. |
format |
Article in Journal/Newspaper |
author |
Bentzen, Rebecca L. Powell, Abby N. Williams, Tony D. Kitaysky, Alexander S. |
author_facet |
Bentzen, Rebecca L. Powell, Abby N. Williams, Tony D. Kitaysky, Alexander S. |
author_sort |
Bentzen, Rebecca L. |
title |
Characterizing the nutritional strategy of incubating king eiders Somateria spectabilis in northern Alaska |
title_short |
Characterizing the nutritional strategy of incubating king eiders Somateria spectabilis in northern Alaska |
title_full |
Characterizing the nutritional strategy of incubating king eiders Somateria spectabilis in northern Alaska |
title_fullStr |
Characterizing the nutritional strategy of incubating king eiders Somateria spectabilis in northern Alaska |
title_full_unstemmed |
Characterizing the nutritional strategy of incubating king eiders Somateria spectabilis in northern Alaska |
title_sort |
characterizing the nutritional strategy of incubating king eiders somateria spectabilis in northern alaska |
publisher |
Wiley |
publishDate |
2008 |
url |
http://dx.doi.org/10.1111/j.1600-048x.2008.04442.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1600-048X.2008.04442.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1600-048X.2008.04442.x |
genre |
Somateria spectabilis Alaska |
genre_facet |
Somateria spectabilis Alaska |
op_source |
Journal of Avian Biology volume 39, issue 6, page 683-690 ISSN 0908-8857 1600-048X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1600-048x.2008.04442.x |
container_title |
Journal of Avian Biology |
container_volume |
39 |
container_issue |
6 |
container_start_page |
683 |
op_container_end_page |
690 |
_version_ |
1794406727561510912 |