|| 要旨トップ | 目次 |||日本生態学会第61回全国大会 (2014年3月、広島) 講演要旨
一般講演（口頭発表） F1-08 (Oral presentation)
Most cooperatively breeding birds, wherein individuals other than parents (helpers) care for offspring, form groups consisting of dominant breeders, and subordinate breeders and helpers. The same sex members may be in conflict over breeding opportunity, and such conflict may affect the occurrence and the levels of subordinates’ contribution to brood care. The ‘pay to stay’ hypothesis predicts that helpers provide help to avoid aggression and eviction by the dominant breeders under such conflict. We investigated nest provisioning in 46 breeding attempts by 29 groups of a cooperatively breeding chestnut-crowned babbler, Pomatostomus ruficeps, in south-eastern Australia over two years, and examined whether subordinate males attempt to show their chick provisioning effort toward the dominant breeding male by adjusting their timing of nest visit. We analyzed (1) synchronous (<1min) nest visit between unrelated subordinate males and the dominant male using a recently developed social network approach, and (2) changes in the daily provisioning rate of the unrelated subordinate males in response to the increase of the provisioning rate by the dominant male. We discuss a role of intra-group conflict in shaping the provisioning behaviours in cooperative breeders.