Kin association during brood care in a facultatively social bird: active discrimination or by-product of partner choice and demography?
Article first published online: 9 MAY 2012
© 2012 Blackwell Publishing Ltd
Volume 21, Issue 13, pages 3341–3351, July 2012
How to Cite
JAATINEN, K., NOREIKIENE, K., MERILÄ, J. and ÖST, M. (2012), Kin association during brood care in a facultatively social bird: active discrimination or by-product of partner choice and demography?. Molecular Ecology, 21: 3341–3351. doi: 10.1111/j.1365-294X.2012.05603.x
- Issue published online: 21 JUN 2012
- Article first published online: 9 MAY 2012
- Received 6 February 2012; revision received 8 March 2012; accepted 13 March 2012
- kin association;
- kin discrimination;
- partner choice;
Intra-group relatedness does not necessarily imply kin selection, a leading explanation for social evolution. An overlooked mechanism for generating population genetic structure is variation in longevity and fecundity, referred to as individual quality, affecting kin structure and the potential for cooperation. Individual quality also affects choosiness in partner choice, a key process explaining cooperation through direct fitness benefits. Reproductive skew theory predicts that relatedness decreases with increasing group size, but this relationship could also arise because of quality-dependent demography and partner choice, without active kin association. We addressed whether brood-rearing eider (Somateria mollissima) females preferentially associated with kin using a 6-year data set with individuals genotyped at 19 microsatellite loci and tested whether relatedness decreased with increasing female group size. We also determined the relationship between local relatedness and indices of female age and body condition. We further examined whether the level of female intracoalition relatedness differed from background relatedness in any year. As predicted, median female intra-group relatedness decreased with increasing female group size. However, the proportion of related individuals increased with advancing female age, and older females prefer smaller brood-rearing coalitions, potentially producing a negative relationship between group size and relatedness. There were considerable annual fluctuations in the level of relatedness between coalition-forming females, and in 1 year this level exceeded that expected by random association. Thus, both passive and active mechanisms govern kin associations in brood-rearing eiders. Eiders apparently can discriminate between kin, but the benefits of doing so may vary over time.