What factors determine cyclic amplitude in the snowshoe hare (Lepusamericanus) cycle?
Snowshoe hares (Lepus americanus Erxleben, 1777) fluctuate in 9–10 year cycles throughout much of their North American range. These cycles show large variations in cyclic amplitude and we ask what factors could cause amplitude variation. We gathered data from 1976 to 2012 on hare numbers in the bore...
Published in: | Canadian Journal of Zoology |
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Format: | Article in Journal/Newspaper |
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2014
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Online Access: | https://researchprofiles.canberra.edu.au/en/publications/e4103b7f-6f9a-43f4-b90a-e44086fc21c8 https://doi.org/10.1139/cjz-2014-0159 https://researchsystem.canberra.edu.au/ws/files/9280421/iluykjhygtf.pdf http://www.scopus.com/inward/record.url?scp=84912125084&partnerID=8YFLogxK |
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ftcanberrauncris:oai:pure.atira.dk:publications/e4103b7f-6f9a-43f4-b90a-e44086fc21c8 2024-09-15T18:26:38+00:00 What factors determine cyclic amplitude in the snowshoe hare (Lepusamericanus) cycle? Krebs, Charles Bryant, John Kielland, Knut O'Donoghue, Mark Doyle, Frank Carriere, Suzanne DiFolco, Donna Berg, Nathan Boonstra, Rudy Boutin, Stan Kenney, Alice Reid, Donald Bodony, Karin Putera, Judy Timm, Henry Burke, Toby Maier, Julie Golden, Howard 2014-10-20 application/pdf https://researchprofiles.canberra.edu.au/en/publications/e4103b7f-6f9a-43f4-b90a-e44086fc21c8 https://doi.org/10.1139/cjz-2014-0159 https://researchsystem.canberra.edu.au/ws/files/9280421/iluykjhygtf.pdf http://www.scopus.com/inward/record.url?scp=84912125084&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Krebs , C , Bryant , J , Kielland , K , O'Donoghue , M , Doyle , F , Carriere , S , DiFolco , D , Berg , N , Boonstra , R , Boutin , S , Kenney , A , Reid , D , Bodony , K , Putera , J , Timm , H , Burke , T , Maier , J & Golden , H 2014 , ' What factors determine cyclic amplitude in the snowshoe hare (Lepusamericanus) cycle? ' , Canadian Journal of Zoology , vol. 92 , no. 12 , pp. 1039-1048 . https://doi.org/10.1139/cjz-2014-0159 article 2014 ftcanberrauncris https://doi.org/10.1139/cjz-2014-0159 2024-09-04T23:40:45Z Snowshoe hares (Lepus americanus Erxleben, 1777) fluctuate in 9–10 year cycles throughout much of their North American range. These cycles show large variations in cyclic amplitude and we ask what factors could cause amplitude variation. We gathered data from 1976 to 2012 on hare numbers in the boreal forest of Alaska, Yukon, Northwest Territories, and northern British Columbia to describe the amplitude of hare fluctuations and to evaluate four possible causes. First, weather could cause variation in amplitude via hare reproduction or survival, but this mechanism does not fit our data. Second, bottom-up processes involving forest succession could explain amplitude variation through changes in winter forage availability, but succession is too slow a variable in our study areas. Third, plant defenses entrained by hare over-browsing in one cycle can produce variation in plant quality and quantity in subsequent cycles. A mathematical model suggests this is a possible explanation. Fourth, predator recovery following the cyclic low is inversely related to hare cyclic amplitude, and the existing data are consistent with this mechanism. A standardized regional monitoring program is needed to improve our understanding of cyclic amplitude variation in hares and the possible role of predators and winter foods in affecting amplitude. Article in Journal/Newspaper Northwest Territories Alaska Yukon University of Canberra Research Portal Canadian Journal of Zoology 92 12 1039 1048 |
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Open Polar |
collection |
University of Canberra Research Portal |
op_collection_id |
ftcanberrauncris |
language |
English |
description |
Snowshoe hares (Lepus americanus Erxleben, 1777) fluctuate in 9–10 year cycles throughout much of their North American range. These cycles show large variations in cyclic amplitude and we ask what factors could cause amplitude variation. We gathered data from 1976 to 2012 on hare numbers in the boreal forest of Alaska, Yukon, Northwest Territories, and northern British Columbia to describe the amplitude of hare fluctuations and to evaluate four possible causes. First, weather could cause variation in amplitude via hare reproduction or survival, but this mechanism does not fit our data. Second, bottom-up processes involving forest succession could explain amplitude variation through changes in winter forage availability, but succession is too slow a variable in our study areas. Third, plant defenses entrained by hare over-browsing in one cycle can produce variation in plant quality and quantity in subsequent cycles. A mathematical model suggests this is a possible explanation. Fourth, predator recovery following the cyclic low is inversely related to hare cyclic amplitude, and the existing data are consistent with this mechanism. A standardized regional monitoring program is needed to improve our understanding of cyclic amplitude variation in hares and the possible role of predators and winter foods in affecting amplitude. |
format |
Article in Journal/Newspaper |
author |
Krebs, Charles Bryant, John Kielland, Knut O'Donoghue, Mark Doyle, Frank Carriere, Suzanne DiFolco, Donna Berg, Nathan Boonstra, Rudy Boutin, Stan Kenney, Alice Reid, Donald Bodony, Karin Putera, Judy Timm, Henry Burke, Toby Maier, Julie Golden, Howard |
spellingShingle |
Krebs, Charles Bryant, John Kielland, Knut O'Donoghue, Mark Doyle, Frank Carriere, Suzanne DiFolco, Donna Berg, Nathan Boonstra, Rudy Boutin, Stan Kenney, Alice Reid, Donald Bodony, Karin Putera, Judy Timm, Henry Burke, Toby Maier, Julie Golden, Howard What factors determine cyclic amplitude in the snowshoe hare (Lepusamericanus) cycle? |
author_facet |
Krebs, Charles Bryant, John Kielland, Knut O'Donoghue, Mark Doyle, Frank Carriere, Suzanne DiFolco, Donna Berg, Nathan Boonstra, Rudy Boutin, Stan Kenney, Alice Reid, Donald Bodony, Karin Putera, Judy Timm, Henry Burke, Toby Maier, Julie Golden, Howard |
author_sort |
Krebs, Charles |
title |
What factors determine cyclic amplitude in the snowshoe hare (Lepusamericanus) cycle? |
title_short |
What factors determine cyclic amplitude in the snowshoe hare (Lepusamericanus) cycle? |
title_full |
What factors determine cyclic amplitude in the snowshoe hare (Lepusamericanus) cycle? |
title_fullStr |
What factors determine cyclic amplitude in the snowshoe hare (Lepusamericanus) cycle? |
title_full_unstemmed |
What factors determine cyclic amplitude in the snowshoe hare (Lepusamericanus) cycle? |
title_sort |
what factors determine cyclic amplitude in the snowshoe hare (lepusamericanus) cycle? |
publishDate |
2014 |
url |
https://researchprofiles.canberra.edu.au/en/publications/e4103b7f-6f9a-43f4-b90a-e44086fc21c8 https://doi.org/10.1139/cjz-2014-0159 https://researchsystem.canberra.edu.au/ws/files/9280421/iluykjhygtf.pdf http://www.scopus.com/inward/record.url?scp=84912125084&partnerID=8YFLogxK |
genre |
Northwest Territories Alaska Yukon |
genre_facet |
Northwest Territories Alaska Yukon |
op_source |
Krebs , C , Bryant , J , Kielland , K , O'Donoghue , M , Doyle , F , Carriere , S , DiFolco , D , Berg , N , Boonstra , R , Boutin , S , Kenney , A , Reid , D , Bodony , K , Putera , J , Timm , H , Burke , T , Maier , J & Golden , H 2014 , ' What factors determine cyclic amplitude in the snowshoe hare (Lepusamericanus) cycle? ' , Canadian Journal of Zoology , vol. 92 , no. 12 , pp. 1039-1048 . https://doi.org/10.1139/cjz-2014-0159 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1139/cjz-2014-0159 |
container_title |
Canadian Journal of Zoology |
container_volume |
92 |
container_issue |
12 |
container_start_page |
1039 |
op_container_end_page |
1048 |
_version_ |
1810467145820143616 |