Context-dependent group size: effects of population density, habitat, and season
Abstract Group size can vary in relation to population density, habitat, and season. Habitat and season may also interact with population density and affect group size through varying foraging benefits of social aggregation in different ecological contexts. We tested the hypothesis that group size v...
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Online Access: | http://dx.doi.org/10.1093/beheco/arab070 http://academic.oup.com/beheco/article-pdf/32/5/970/40787188/arab070.pdf |
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croxfordunivpr:10.1093/beheco/arab070 2024-09-15T18:01:46+00:00 Context-dependent group size: effects of population density, habitat, and season Webber, Quinn M R Vander Wal, Eric Pinter-Wollman, Noa Vanier Canada Graduate Scholarship Natural Sciences and Engineering Research Council 2021 http://dx.doi.org/10.1093/beheco/arab070 http://academic.oup.com/beheco/article-pdf/32/5/970/40787188/arab070.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Behavioral Ecology volume 32, issue 5, page 970-981 ISSN 1045-2249 1465-7279 journal-article 2021 croxfordunivpr https://doi.org/10.1093/beheco/arab070 2024-08-12T04:25:41Z Abstract Group size can vary in relation to population density, habitat, and season. Habitat and season may also interact with population density and affect group size through varying foraging benefits of social aggregation in different ecological contexts. We tested the hypothesis that group size varies across ecological contexts, including population density, habitat type, and season, for woodland caribou (Rangifer tarandus) in ten herds over 25 years in Newfoundland, Canada. We predicted that group size would increase as a function of population density. Based on the foraging benefits of social aggregation, we predicted larger groups as habitat openness increased because open areas tend to have higher quality foraging resources. We predicted larger groups during winter when foraging resources are covered in snow because caribou and other social animals exploit social information about the location of foraging resources. In contrast to our prediction, group size decreased as a function of population density. In support of our prediction, group size was larger in winter than calving and summer, and we found that group size increased with habitat openness in some, but not all, cases. Patterns of animal grouping are context-dependent and the additive effect of different ecological contexts on variation in group size informs our understanding of the implicit trade-offs between competition, predation risk, and profitability of forage. Article in Journal/Newspaper caribou Newfoundland Rangifer tarandus Oxford University Press Behavioral Ecology |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract Group size can vary in relation to population density, habitat, and season. Habitat and season may also interact with population density and affect group size through varying foraging benefits of social aggregation in different ecological contexts. We tested the hypothesis that group size varies across ecological contexts, including population density, habitat type, and season, for woodland caribou (Rangifer tarandus) in ten herds over 25 years in Newfoundland, Canada. We predicted that group size would increase as a function of population density. Based on the foraging benefits of social aggregation, we predicted larger groups as habitat openness increased because open areas tend to have higher quality foraging resources. We predicted larger groups during winter when foraging resources are covered in snow because caribou and other social animals exploit social information about the location of foraging resources. In contrast to our prediction, group size decreased as a function of population density. In support of our prediction, group size was larger in winter than calving and summer, and we found that group size increased with habitat openness in some, but not all, cases. Patterns of animal grouping are context-dependent and the additive effect of different ecological contexts on variation in group size informs our understanding of the implicit trade-offs between competition, predation risk, and profitability of forage. |
author2 |
Pinter-Wollman, Noa Vanier Canada Graduate Scholarship Natural Sciences and Engineering Research Council |
format |
Article in Journal/Newspaper |
author |
Webber, Quinn M R Vander Wal, Eric |
spellingShingle |
Webber, Quinn M R Vander Wal, Eric Context-dependent group size: effects of population density, habitat, and season |
author_facet |
Webber, Quinn M R Vander Wal, Eric |
author_sort |
Webber, Quinn M R |
title |
Context-dependent group size: effects of population density, habitat, and season |
title_short |
Context-dependent group size: effects of population density, habitat, and season |
title_full |
Context-dependent group size: effects of population density, habitat, and season |
title_fullStr |
Context-dependent group size: effects of population density, habitat, and season |
title_full_unstemmed |
Context-dependent group size: effects of population density, habitat, and season |
title_sort |
context-dependent group size: effects of population density, habitat, and season |
publisher |
Oxford University Press (OUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1093/beheco/arab070 http://academic.oup.com/beheco/article-pdf/32/5/970/40787188/arab070.pdf |
genre |
caribou Newfoundland Rangifer tarandus |
genre_facet |
caribou Newfoundland Rangifer tarandus |
op_source |
Behavioral Ecology volume 32, issue 5, page 970-981 ISSN 1045-2249 1465-7279 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/beheco/arab070 |
container_title |
Behavioral Ecology |
_version_ |
1810438841329254400 |