Saami reindeer herders cooperate with social group members and genetic kin
Cooperative behaviors evolve by ultimately increasing the inclusive fitness of performers as well as recipients of those behaviors. Such increases can occur via direct or indirect fitness benefits, theoretically explained by reciprocal altruism and kin selection, respectively. However, humans are kn...
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Online Access: | https://hdl.handle.net/11250/3067354 https://doi.org/10.1093/beheco/arv106 |
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ftniku:oai:niku.brage.unit.no:11250/3067354 2023-06-11T04:16:19+02:00 Saami reindeer herders cooperate with social group members and genetic kin Thomas, Matthew G. Næss, Marius Warg Bårdsen, Bård-Jørgen Mace, Ruth 2015 application/pdf https://hdl.handle.net/11250/3067354 https://doi.org/10.1093/beheco/arv106 eng eng https://hdl.handle.net/11250/3067354 https://doi.org/10.1093/beheco/arv106 1495-1501 26 Behavioral Ecology 6 Journal article 2015 ftniku https://doi.org/10.1093/beheco/arv106 2023-05-10T22:49:58Z Cooperative behaviors evolve by ultimately increasing the inclusive fitness of performers as well as recipients of those behaviors. Such increases can occur via direct or indirect fitness benefits, theoretically explained by reciprocal altruism and kin selection, respectively. However, humans are known for cooperating with individuals who are not necessarily genetic relatives, which seemingly precludes kin selection as an explanation. Here, we aim to quantify the relative importance of kinship and social group membership as mediators of cooperative behavior. Using an experimental gift game, we test whether indigenous Saami reindeer herders in Norway give gifts to genetic relatives or to members of their cooperative herding group (the “siida”) or both. Membership of the same siida strongly increased the odds of gift giving. Kinship had a smaller, albeit positive, effect. Gifts were not preferentially given to younger family members, contrary to predictions relating to intergenerational resource transfers as a form of parental investment. These patterns suggest that social grouping can be at least as important as genetic factors in mediating cooperative behavior in this population. This is likely to reflect the importance of herding groups in day-to-day subsistence. publishedVersion Article in Journal/Newspaper saami Norwegian Institute for Cultural Heritage Research (NIKU): Brage Norway Behavioral Ecology 26 6 1495 1501 |
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Open Polar |
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Norwegian Institute for Cultural Heritage Research (NIKU): Brage |
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ftniku |
language |
English |
description |
Cooperative behaviors evolve by ultimately increasing the inclusive fitness of performers as well as recipients of those behaviors. Such increases can occur via direct or indirect fitness benefits, theoretically explained by reciprocal altruism and kin selection, respectively. However, humans are known for cooperating with individuals who are not necessarily genetic relatives, which seemingly precludes kin selection as an explanation. Here, we aim to quantify the relative importance of kinship and social group membership as mediators of cooperative behavior. Using an experimental gift game, we test whether indigenous Saami reindeer herders in Norway give gifts to genetic relatives or to members of their cooperative herding group (the “siida”) or both. Membership of the same siida strongly increased the odds of gift giving. Kinship had a smaller, albeit positive, effect. Gifts were not preferentially given to younger family members, contrary to predictions relating to intergenerational resource transfers as a form of parental investment. These patterns suggest that social grouping can be at least as important as genetic factors in mediating cooperative behavior in this population. This is likely to reflect the importance of herding groups in day-to-day subsistence. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Thomas, Matthew G. Næss, Marius Warg Bårdsen, Bård-Jørgen Mace, Ruth |
spellingShingle |
Thomas, Matthew G. Næss, Marius Warg Bårdsen, Bård-Jørgen Mace, Ruth Saami reindeer herders cooperate with social group members and genetic kin |
author_facet |
Thomas, Matthew G. Næss, Marius Warg Bårdsen, Bård-Jørgen Mace, Ruth |
author_sort |
Thomas, Matthew G. |
title |
Saami reindeer herders cooperate with social group members and genetic kin |
title_short |
Saami reindeer herders cooperate with social group members and genetic kin |
title_full |
Saami reindeer herders cooperate with social group members and genetic kin |
title_fullStr |
Saami reindeer herders cooperate with social group members and genetic kin |
title_full_unstemmed |
Saami reindeer herders cooperate with social group members and genetic kin |
title_sort |
saami reindeer herders cooperate with social group members and genetic kin |
publishDate |
2015 |
url |
https://hdl.handle.net/11250/3067354 https://doi.org/10.1093/beheco/arv106 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
saami |
genre_facet |
saami |
op_source |
1495-1501 26 Behavioral Ecology 6 |
op_relation |
https://hdl.handle.net/11250/3067354 https://doi.org/10.1093/beheco/arv106 |
op_doi |
https://doi.org/10.1093/beheco/arv106 |
container_title |
Behavioral Ecology |
container_volume |
26 |
container_issue |
6 |
container_start_page |
1495 |
op_container_end_page |
1501 |
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1768373979373895680 |