Data from: Brood size matching: a novel perspective on predator dilution
A primary benefit of grouping is diluting the individual risk of attack by predators. However, the fact that groups are formed not always by solitary adults but also by subgroups (e.g., families) has been overlooked. The subgroup-specific benefit of predator dilution depends on its relative contribu...
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ftzenodo:oai:zenodo.org:5017294 2024-09-15T18:36:00+00:00 Data from: Brood size matching: a novel perspective on predator dilution Jaatinen, Kim Öst, Markus 2012-09-27 https://doi.org/10.5061/dryad.mn11k unknown Zenodo https://doi.org/10.1086/668824 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.mn11k oai:zenodo.org:5017294 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode Behavior: antipredator Somateria mollissima Behavior: social Behavior: reproductive Ecology: behavioral Interactions: predation info:eu-repo/semantics/other 2012 ftzenodo https://doi.org/10.5061/dryad.mn11k10.1086/668824 2024-07-25T12:56:56Z A primary benefit of grouping is diluting the individual risk of attack by predators. However, the fact that groups are formed not always by solitary adults but also by subgroups (e.g., families) has been overlooked. The subgroup-specific benefit of predator dilution depends on its relative contribution to total group size. Therefore, the willingness of a subgroup to merge with others should increase the less it contributes to total group size, but the conflicting preferences of partners may result in the preferential merger of similar-sized subgroups. Here, we evaluate how the proportional contribution of subgroups to diluting risk affects group formation. We generate predictions using a bidding game over parental care and test them using data on common eiders (Somateria mollissima), in which females with variable-sized broods may form brood-rearing coalitions. The predictions (1) that size-matched subgroups should have a higher propensity to merge, (2) that predation should increase group formation propensity, and (3) that increased bargaining power, as proxied by female body condition, should increase the time needed to establish partnerships were all supported. Partners do negotiate over their relative contributions to predator dilution, accepting or rejecting partnerships on the basis of this criterion. Our results show that consideration of the size of subgroups before merger is critical in understanding the process of group formation under the threat of predation. Eider Field data on eider group formation behaviour. Other/Unknown Material Somateria mollissima Zenodo |
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Behavior: antipredator Somateria mollissima Behavior: social Behavior: reproductive Ecology: behavioral Interactions: predation |
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Behavior: antipredator Somateria mollissima Behavior: social Behavior: reproductive Ecology: behavioral Interactions: predation Jaatinen, Kim Öst, Markus Data from: Brood size matching: a novel perspective on predator dilution |
topic_facet |
Behavior: antipredator Somateria mollissima Behavior: social Behavior: reproductive Ecology: behavioral Interactions: predation |
description |
A primary benefit of grouping is diluting the individual risk of attack by predators. However, the fact that groups are formed not always by solitary adults but also by subgroups (e.g., families) has been overlooked. The subgroup-specific benefit of predator dilution depends on its relative contribution to total group size. Therefore, the willingness of a subgroup to merge with others should increase the less it contributes to total group size, but the conflicting preferences of partners may result in the preferential merger of similar-sized subgroups. Here, we evaluate how the proportional contribution of subgroups to diluting risk affects group formation. We generate predictions using a bidding game over parental care and test them using data on common eiders (Somateria mollissima), in which females with variable-sized broods may form brood-rearing coalitions. The predictions (1) that size-matched subgroups should have a higher propensity to merge, (2) that predation should increase group formation propensity, and (3) that increased bargaining power, as proxied by female body condition, should increase the time needed to establish partnerships were all supported. Partners do negotiate over their relative contributions to predator dilution, accepting or rejecting partnerships on the basis of this criterion. Our results show that consideration of the size of subgroups before merger is critical in understanding the process of group formation under the threat of predation. Eider Field data on eider group formation behaviour. |
format |
Other/Unknown Material |
author |
Jaatinen, Kim Öst, Markus |
author_facet |
Jaatinen, Kim Öst, Markus |
author_sort |
Jaatinen, Kim |
title |
Data from: Brood size matching: a novel perspective on predator dilution |
title_short |
Data from: Brood size matching: a novel perspective on predator dilution |
title_full |
Data from: Brood size matching: a novel perspective on predator dilution |
title_fullStr |
Data from: Brood size matching: a novel perspective on predator dilution |
title_full_unstemmed |
Data from: Brood size matching: a novel perspective on predator dilution |
title_sort |
data from: brood size matching: a novel perspective on predator dilution |
publisher |
Zenodo |
publishDate |
2012 |
url |
https://doi.org/10.5061/dryad.mn11k |
genre |
Somateria mollissima |
genre_facet |
Somateria mollissima |
op_relation |
https://doi.org/10.1086/668824 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.mn11k oai:zenodo.org:5017294 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.mn11k10.1086/668824 |
_version_ |
1810479195162148864 |