Fat and protein reserves of wintering and prebreeding rock ptarmigan from south Hudson Bay
The proximate body composition and muscle and organ composition of rock ptarmigan (Lagopus mutus rupestris) were measured in birds collected during late winter at Winisk, Ontario, and just prior to breeding after their migration to southern Baffin Island. The neutral fat reserve was less than 4% of...
Published in: | Canadian Journal of Zoology |
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Language: | English |
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Canadian Science Publishing
1981
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Online Access: | http://dx.doi.org/10.1139/z81-172 http://www.nrcresearchpress.com/doi/pdf/10.1139/z81-172 |
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crcansciencepubl:10.1139/z81-172 2023-12-17T10:27:36+01:00 Fat and protein reserves of wintering and prebreeding rock ptarmigan from south Hudson Bay Thomas, Vernon G. Popko, Richard 1981 http://dx.doi.org/10.1139/z81-172 http://www.nrcresearchpress.com/doi/pdf/10.1139/z81-172 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 59, issue 7, page 1205-1211 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1981 crcansciencepubl https://doi.org/10.1139/z81-172 2023-11-19T13:39:36Z The proximate body composition and muscle and organ composition of rock ptarmigan (Lagopus mutus rupestris) were measured in birds collected during late winter at Winisk, Ontario, and just prior to breeding after their migration to southern Baffin Island. The neutral fat reserve was less than 4% of the body weight in male and female ptarmigan from both locations. This small lipid-energy reserve, coupled with the catabolism of labile protein, would not maintain the existence-energy requirements of rock ptarmigan for longer than 2 days during fasting winter conditions.The ovary weight and liver weight were not correlated with the neutral fat load of prebreeding females, but hypertrophy of the liver was apparent. In the absence of food the small amount of neutral fat and labile protein could help form only a fraction of the normal clutch size, but the possible role of these reserves in buffering short-term dietary shortages during egg formation is outlined. The small size of the energy reserves emphasizes the importance of persistent feeding during winter, to maintain homeothermy, and during egg formation, when the quantity and quality of food could be a proximate limiting factor in reproduction. Article in Journal/Newspaper Baffin Island Baffin Hudson Bay Lagopus mutus rock ptarmigan Canadian Science Publishing (via Crossref) Hudson Bay Baffin Island Hudson Winisk ENVELOPE(-85.200,-85.200,55.267,55.267) Canadian Journal of Zoology 59 7 1205 1211 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Thomas, Vernon G. Popko, Richard Fat and protein reserves of wintering and prebreeding rock ptarmigan from south Hudson Bay |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
The proximate body composition and muscle and organ composition of rock ptarmigan (Lagopus mutus rupestris) were measured in birds collected during late winter at Winisk, Ontario, and just prior to breeding after their migration to southern Baffin Island. The neutral fat reserve was less than 4% of the body weight in male and female ptarmigan from both locations. This small lipid-energy reserve, coupled with the catabolism of labile protein, would not maintain the existence-energy requirements of rock ptarmigan for longer than 2 days during fasting winter conditions.The ovary weight and liver weight were not correlated with the neutral fat load of prebreeding females, but hypertrophy of the liver was apparent. In the absence of food the small amount of neutral fat and labile protein could help form only a fraction of the normal clutch size, but the possible role of these reserves in buffering short-term dietary shortages during egg formation is outlined. The small size of the energy reserves emphasizes the importance of persistent feeding during winter, to maintain homeothermy, and during egg formation, when the quantity and quality of food could be a proximate limiting factor in reproduction. |
format |
Article in Journal/Newspaper |
author |
Thomas, Vernon G. Popko, Richard |
author_facet |
Thomas, Vernon G. Popko, Richard |
author_sort |
Thomas, Vernon G. |
title |
Fat and protein reserves of wintering and prebreeding rock ptarmigan from south Hudson Bay |
title_short |
Fat and protein reserves of wintering and prebreeding rock ptarmigan from south Hudson Bay |
title_full |
Fat and protein reserves of wintering and prebreeding rock ptarmigan from south Hudson Bay |
title_fullStr |
Fat and protein reserves of wintering and prebreeding rock ptarmigan from south Hudson Bay |
title_full_unstemmed |
Fat and protein reserves of wintering and prebreeding rock ptarmigan from south Hudson Bay |
title_sort |
fat and protein reserves of wintering and prebreeding rock ptarmigan from south hudson bay |
publisher |
Canadian Science Publishing |
publishDate |
1981 |
url |
http://dx.doi.org/10.1139/z81-172 http://www.nrcresearchpress.com/doi/pdf/10.1139/z81-172 |
long_lat |
ENVELOPE(-85.200,-85.200,55.267,55.267) |
geographic |
Hudson Bay Baffin Island Hudson Winisk |
geographic_facet |
Hudson Bay Baffin Island Hudson Winisk |
genre |
Baffin Island Baffin Hudson Bay Lagopus mutus rock ptarmigan |
genre_facet |
Baffin Island Baffin Hudson Bay Lagopus mutus rock ptarmigan |
op_source |
Canadian Journal of Zoology volume 59, issue 7, page 1205-1211 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z81-172 |
container_title |
Canadian Journal of Zoology |
container_volume |
59 |
container_issue |
7 |
container_start_page |
1205 |
op_container_end_page |
1211 |
_version_ |
1785579484667183104 |