The interactive effects of food and predators on reproduction and overwinter survival of arctic ground squirrels
Summary 1. We examined the effects of food and predators on population limitation in the arctic ground squirrel ( Spermophilus parryii plesius Richardson) in the boreal forest of the south‐western Yukon. We focused on ground squirrel reproduction and overwinter survival. 2. Squirrel populations were...
Published in: | Journal of Animal Ecology |
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Online Access: | http://dx.doi.org/10.1046/j.1365-2656.2000.00387.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2656.2000.00387.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2656.2000.00387.x |
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crwiley:10.1046/j.1365-2656.2000.00387.x 2024-06-02T08:00:13+00:00 The interactive effects of food and predators on reproduction and overwinter survival of arctic ground squirrels Karels, Tim J. Byrom, Andrea E. Boonstra, Rudy Krebs, Charles J. 2000 http://dx.doi.org/10.1046/j.1365-2656.2000.00387.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2656.2000.00387.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2656.2000.00387.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Animal Ecology volume 69, issue 2, page 235-247 ISSN 0021-8790 1365-2656 journal-article 2000 crwiley https://doi.org/10.1046/j.1365-2656.2000.00387.x 2024-05-03T10:58:49Z Summary 1. We examined the effects of food and predators on population limitation in the arctic ground squirrel ( Spermophilus parryii plesius Richardson) in the boreal forest of the south‐western Yukon. We focused on ground squirrel reproduction and overwinter survival. 2. Squirrel populations were monitored by live‐trapping and radio‐telemetry from 1993 to the spring of 1996 on four control and four experimental areas (one predator exclosure treatment, two food addition treatments, and one predator exclosure plus food addition treatment). 3. Predator exclusion increased body condition, percentage lactating, percentage weaning litters, litter size, and doubled population density relative to controls, but had no effect on juvenile growth rate, overwinter survival, or juvenile emergence date. 4. Food addition advanced juvenile emergence date and increased adult body condition, percentage lactating, percentage weaning litters, litter size, population density relative to controls (4–7 fold), but had no effect on juvenile growth rate or overwinter survival. 5. Predator exclusion combined with food addition increased adult body condition, percentage lactating, percentage weaning litters, and population density relative to controls (19‐fold). 6. We conclude that arctic ground squirrels in the boreal forest are limited by an interaction between food and predation, acting primarily through changes in reproduction, and that their impact on density was multiplicative. Article in Journal/Newspaper Arctic ground squirrel Arctic Yukon Wiley Online Library Arctic Yukon Journal of Animal Ecology 69 2 235 247 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Summary 1. We examined the effects of food and predators on population limitation in the arctic ground squirrel ( Spermophilus parryii plesius Richardson) in the boreal forest of the south‐western Yukon. We focused on ground squirrel reproduction and overwinter survival. 2. Squirrel populations were monitored by live‐trapping and radio‐telemetry from 1993 to the spring of 1996 on four control and four experimental areas (one predator exclosure treatment, two food addition treatments, and one predator exclosure plus food addition treatment). 3. Predator exclusion increased body condition, percentage lactating, percentage weaning litters, litter size, and doubled population density relative to controls, but had no effect on juvenile growth rate, overwinter survival, or juvenile emergence date. 4. Food addition advanced juvenile emergence date and increased adult body condition, percentage lactating, percentage weaning litters, litter size, population density relative to controls (4–7 fold), but had no effect on juvenile growth rate or overwinter survival. 5. Predator exclusion combined with food addition increased adult body condition, percentage lactating, percentage weaning litters, and population density relative to controls (19‐fold). 6. We conclude that arctic ground squirrels in the boreal forest are limited by an interaction between food and predation, acting primarily through changes in reproduction, and that their impact on density was multiplicative. |
format |
Article in Journal/Newspaper |
author |
Karels, Tim J. Byrom, Andrea E. Boonstra, Rudy Krebs, Charles J. |
spellingShingle |
Karels, Tim J. Byrom, Andrea E. Boonstra, Rudy Krebs, Charles J. The interactive effects of food and predators on reproduction and overwinter survival of arctic ground squirrels |
author_facet |
Karels, Tim J. Byrom, Andrea E. Boonstra, Rudy Krebs, Charles J. |
author_sort |
Karels, Tim J. |
title |
The interactive effects of food and predators on reproduction and overwinter survival of arctic ground squirrels |
title_short |
The interactive effects of food and predators on reproduction and overwinter survival of arctic ground squirrels |
title_full |
The interactive effects of food and predators on reproduction and overwinter survival of arctic ground squirrels |
title_fullStr |
The interactive effects of food and predators on reproduction and overwinter survival of arctic ground squirrels |
title_full_unstemmed |
The interactive effects of food and predators on reproduction and overwinter survival of arctic ground squirrels |
title_sort |
interactive effects of food and predators on reproduction and overwinter survival of arctic ground squirrels |
publisher |
Wiley |
publishDate |
2000 |
url |
http://dx.doi.org/10.1046/j.1365-2656.2000.00387.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2656.2000.00387.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2656.2000.00387.x |
geographic |
Arctic Yukon |
geographic_facet |
Arctic Yukon |
genre |
Arctic ground squirrel Arctic Yukon |
genre_facet |
Arctic ground squirrel Arctic Yukon |
op_source |
Journal of Animal Ecology volume 69, issue 2, page 235-247 ISSN 0021-8790 1365-2656 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-2656.2000.00387.x |
container_title |
Journal of Animal Ecology |
container_volume |
69 |
container_issue |
2 |
container_start_page |
235 |
op_container_end_page |
247 |
_version_ |
1800744200038252544 |