| Titre : | Kin structure and choice of brood care in a Common Eider (Somateria m. mollissima) population |
| Auteurs : | Martti Hario, Auteur ; Marja-Liisa Koljonen, Auteur ; Jukka Rintala, Auteur |
| Type de document : | Article |
| Dans : | Journal of Ornithology (153(3) JUL 2012) |
| Article en page(s) : | 963-973 |
| Langues: | Anglais |
| Résumé : | We investigated the presence of kin-biased cooperative breeding in the Common Eider (Somateria m. mollissima), a colonial seaduck commonly presumed to have a high rate of natal philopatry. Based on a 23-year-long time series of individually marked mothers and daughters, we found that on average 18% of the study population consisted of first-order relatives: mothers, daughters, and female siblings. However, there were years with no or only a few first-order kin pairs present. This was due to the overall low duckling survival in this species and the high rate of natal dispersal in this population. There was no apparent tendency for timely nesting relatives (laying within 3 days of each other) to approach each other, indicating no firm kin recognition. In a 3-year sampling of DNA from egg shell membranes, the annual rate of intraspecific brood parasitism in the population varied between 25 and 67%. However, becoming parasitized had no effect on the subsequent choice of brood tending tactics, i.e., whether to tend alone or communally. Neither was the choice of brood tending tactics affected by the number of own eggs in the clutch or by the female body condition. However, becoming a communal brood-tender was jointly contributed by the presence of alien eggs in the nest and the presence of first-order kin in the colony during early breeding. The greatest effect on females favoring communal brood care instead of rearing alone was due to the number of similar-aged broods nearby at the time of nest exodus. We found no evidence of firm kin recognition among individuals in our study population. |
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