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‘Adoption’ by maternal siblings in wild chimpanzees

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Hobaiter_2014_PLOSone_Adoption.pdf (189.6Kb)
Date
01/08/2014
Author
Hobaiter, Cat
Schel, Anne Marijke
Langergraber, Kevin
Zuberbuehler, Klaus
Keywords
QL Zoology
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Abstract
The adoption of unrelated orphaned infants is something chimpanzees and humans have in common. Providing parental care has fitness implications for both the adopter and orphan, and cases of adoption have thus been cited as evidence for a shared origin of an altruistic behaviour. We provide new data on adoptions in the free-living Sonso chimpanzee community in Uganda, together with an analysis of published data from other long-term field sites. As a default pattern, we find that orphan chimpanzees do not become adopted by adult group members but wherever possible associate with each other, usually as maternal sibling pairs. This occurs even if both partners are still immature, with older individuals effectively becoming ‘child household heads’. Adoption of orphans by unrelated individuals does occur but usually only if no maternal siblings or other relatives are present and only after significant delays. In conclusion, following the loss of their mother, orphaned chimpanzees preferentially associate along pre-existing social bonds, which are typically strongest amongst maternal siblings.
Citation
Hobaiter , C , Schel , A M , Langergraber , K & Zuberbuehler , K 2014 , ' ‘Adoption’ by maternal siblings in wild chimpanzees ' , PLoS ONE , vol. 9 , no. 8 , e103777 . https://doi.org/10.1371/journal.pone.0103777
Publication
PLoS ONE
Status
Peer reviewed
DOI
https://doi.org/10.1371/journal.pone.0103777
ISSN
1932-6203
Type
Journal article
Rights
© 2014 Hobaiter et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Description
This research was funded by the Leverhulme Trust Research Leadership Award F/00268/AP (http://www.leverhulme.ac.uk/), a Wenner-Gren Foundation Dissertation Fieldwork grant (http://www.wennergren.org/), the British Academy Grant SG411998 (http://www.brit.ac.uk) and the Royal Zoological Society of Scotland (http://www.rzss.org.uk). This project has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 283871. Genetic analyses were funded by the Max Planck Society, Boston University, and the Leakey Foundation.
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URL
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0103777
URI
http://hdl.handle.net/10023/5087

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