caa a22 4500 357894685 CHVBK 20190303132711.0 cr unu---uuuuu 160308s2016 xx s 000 0 eng 10.1111/jeb.12793 doi (SERVAL)BIB_E1ABEF5576C9 26563617 pmid 000370070500014 isiid Reciprocal preening and food sharing in colour-polymorphic nestling barn owls [Elektronische Daten] [A. Roulin, B. Des Monstiers, E. Ifrid, A. Da Silva, E. Genzoni, A.N. Dreiss] Barn owl (Tyto alba) siblings preen and offer food items to one another, behaviours that can be considered prosocial because they benefit a conspecific by relieving distress or need. In experimental broods, we analysed whether such behaviours were reciprocated, preferentially exchanged between specific phenotypes, performed to avoid harassment and food theft or signals of hierarchy status. Three of the results are consistent with the hypothesis of direct reciprocity. First, food sharing was reciprocated in three-chick broods but not in pairs of siblings, that is when nestlings could choose a partner with whom to develop a reciprocating interaction. Second, a nestling was more likely to give a prey item to its sibling if the latter individual had preened the former. Third, siblings matched their investment in preening each other. Manipulation of age hierarchy showed that food stealing was directed towards older siblings but was not performed to compensate for a low level of cooperation received. Social behaviours were related to melanin-based coloration, suggesting that animals may signal their propensity to interact socially. The most prosocial phenotype (darker reddish) was also the phenotype that stole more food, and the effect of coloration on prosocial behaviour depended upon rank and sex, suggesting that colour-related prosociality is state dependent. Roulin A. aut Des Monstiers B. aut Ifrid E. aut Da Silva A. aut Genzoni E. aut Dreiss A.N. aut Journal of Evolutionary Biology 29/2(2016), 380-394 29:2<380-394 2016 29 1 article serval SERVAL 700 1- Roulin A. aut SERVAL 700 1- Des Monstiers B. aut SERVAL 700 1- Ifrid E. aut SERVAL 700 1- Da Silva A. aut SERVAL 700 1- Genzoni E. aut SERVAL 700 1- Dreiss A.N. aut SERVAL 773 0- Journal of Evolutionary Biology 29/2(2016), 380-394 29:2<380-394 2016 29 BK010053 XK010053 XK010000 SERVAL SERVAL SERVAL article