Dominance, not kinship, determines individual position within the communal roosts of a cooperatively breeding bird

Kin selection has played an important role in the evolution and maintenance of cooperative breeding behaviour in many bird species. However, although relatedness has been shown to affect the investment decisions of helpers in such systems, less is known about the role that kin discrimination plays i...

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Vydané v:	Behavioral ecology and sociobiology Ročník 67; číslo 12; s. 2029 - 2039
Hlavní autori:	Napper, Clare J., Sharp, Stuart P., McGowan, Andrew, Simeoni, Michelle, Hatchwell, Ben J.
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Berlin/Heidelberg Springer 01.12.2013 Springer Berlin Heidelberg Springer Nature B.V
Predmet:	Aegithalos caudatus Animal behavior Animal breeding Animal Ecology Animal reproduction Animals Aves Aviculture Behavioral biology Behavioral Sciences Biomedical and Life Sciences Birds Body size Breeding Cooperation Discrimination Dominance Evolution Female animals females Flocks heat Hierarchies Interpersonal relations Investment decision kin selection Kinship Life Sciences Male animals males Original Paper Relatedness Sex ratio Social behavior Social interaction Zoology Kinship Dominance Long-tailed tit Cooperative breeding Roost
ISSN:	0340-5443, 1432-0762
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Shrnutí:	Kin selection has played an important role in the evolution and maintenance of cooperative breeding behaviour in many bird species. However, although relatedness has been shown to affect the investment decisions of helpers in such systems, less is known about the role that kin discrimination plays in other contexts, such as communal roosting. Individuals that roost communally benefit from reduced overnight heat loss, but the exact benefit derived depends on an individual's position in the roost which in turn is likely to be influenced by its position in its flock's dominance hierarchy. We studied the effects of kinship and other factors (sex, age, body size and flock sex ratio) on an individual's roosting position and dominance status in captive flocks of cooperatively breeding longtailed tits Aegithalos caudatus. We found that overall, kinship had little influence on either variable tested; kinship had no effect on a bird's position in its flock's dominance hierarchy and the effect of kinship on roosting position was dependent on the bird's size. Males were generally dominant over females and birds were more likely to occupy preferred roosting positions if they were male, old and of high status. In this context, the effect of kinship on social interactions appears to be less important than the effects of other factors, possibly due to the complex kin structure of winter flocks compared to breeding groups.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0340-5443 1432-0762
DOI:	10.1007/s00265-013-1613-7