The relationship between fertility and fat reserves of Peary caribou
There was a close association between pregnancy rates and levels of fat reserves and body weights in Peary caribou (Rangifer tarandus pearyi) collected in the late winters of 1974 through 1977 on several islands in the Canadian Arctic. Pregnancy rates were <8% in adult (>2 years) femal...
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Language: | English |
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Canadian Science Publishing
1982
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Online Access: | http://dx.doi.org/10.1139/z82-089 http://www.nrcresearchpress.com/doi/pdf/10.1139/z82-089 |
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crcansciencepubl:10.1139/z82-089 2023-12-17T10:26:18+01:00 The relationship between fertility and fat reserves of Peary caribou Thomas, Donald C. 1982 http://dx.doi.org/10.1139/z82-089 http://www.nrcresearchpress.com/doi/pdf/10.1139/z82-089 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 60, issue 4, page 597-602 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1982 crcansciencepubl https://doi.org/10.1139/z82-089 2023-11-19T13:38:39Z There was a close association between pregnancy rates and levels of fat reserves and body weights in Peary caribou (Rangifer tarandus pearyi) collected in the late winters of 1974 through 1977 on several islands in the Canadian Arctic. Pregnancy rates were <8% in adult (>2 years) females weighing <53 kg in March and April, >75% in those weighing >57 kg, and 100% in those >67 kg in weight. Pregnancy rates increased progressively from 7 to 100% as the percentage marrow fat increased from 43 to 79% and the kidney-fat index increased from 24 to 41%. Only heavy (>46 kg) yearling (21 month) females with high fat reserves were pregnant. Reproduction virtually ceased from 1973–1974 to 1975–1976 in Peary caribou on the western Queen Elizabeth Islands because their physical condition was poor. Pregnancy rates were as high as 100% in females in a second population located on Somerset and Prince of Wales islands, and in 1974–1975 four of five yearling females were pregnant. The adjustment of fertility to energy reserves is viewed as an adaptation to conserve energy. It is well developed in Peary caribou whose environment is characterized by a highly variable and often harsh climate in which negative energy balances probably prevail for 8 to 10 months of the year. Article in Journal/Newspaper Arctic caribou Queen Elizabeth Islands Rangifer tarandus Canadian Science Publishing (via Crossref) Arctic Peary ENVELOPE(-63.867,-63.867,-65.250,-65.250) Canadian Journal of Zoology 60 4 597 602 |
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, Donald C. The relationship between fertility and fat reserves of Peary caribou |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
There was a close association between pregnancy rates and levels of fat reserves and body weights in Peary caribou (Rangifer tarandus pearyi) collected in the late winters of 1974 through 1977 on several islands in the Canadian Arctic. Pregnancy rates were <8% in adult (>2 years) females weighing <53 kg in March and April, >75% in those weighing >57 kg, and 100% in those >67 kg in weight. Pregnancy rates increased progressively from 7 to 100% as the percentage marrow fat increased from 43 to 79% and the kidney-fat index increased from 24 to 41%. Only heavy (>46 kg) yearling (21 month) females with high fat reserves were pregnant. Reproduction virtually ceased from 1973–1974 to 1975–1976 in Peary caribou on the western Queen Elizabeth Islands because their physical condition was poor. Pregnancy rates were as high as 100% in females in a second population located on Somerset and Prince of Wales islands, and in 1974–1975 four of five yearling females were pregnant. The adjustment of fertility to energy reserves is viewed as an adaptation to conserve energy. It is well developed in Peary caribou whose environment is characterized by a highly variable and often harsh climate in which negative energy balances probably prevail for 8 to 10 months of the year. |
format |
Article in Journal/Newspaper |
author |
Thomas, Donald C. |
author_facet |
Thomas, Donald C. |
author_sort |
Thomas, Donald C. |
title |
The relationship between fertility and fat reserves of Peary caribou |
title_short |
The relationship between fertility and fat reserves of Peary caribou |
title_full |
The relationship between fertility and fat reserves of Peary caribou |
title_fullStr |
The relationship between fertility and fat reserves of Peary caribou |
title_full_unstemmed |
The relationship between fertility and fat reserves of Peary caribou |
title_sort |
relationship between fertility and fat reserves of peary caribou |
publisher |
Canadian Science Publishing |
publishDate |
1982 |
url |
http://dx.doi.org/10.1139/z82-089 http://www.nrcresearchpress.com/doi/pdf/10.1139/z82-089 |
long_lat |
ENVELOPE(-63.867,-63.867,-65.250,-65.250) |
geographic |
Arctic Peary |
geographic_facet |
Arctic Peary |
genre |
Arctic caribou Queen Elizabeth Islands Rangifer tarandus |
genre_facet |
Arctic caribou Queen Elizabeth Islands Rangifer tarandus |
op_source |
Canadian Journal of Zoology volume 60, issue 4, page 597-602 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z82-089 |
container_title |
Canadian Journal of Zoology |
container_volume |
60 |
container_issue |
4 |
container_start_page |
597 |
op_container_end_page |
602 |
_version_ |
1785578029327581184 |