Subordinate females in the cooperatively breeding Seychelles warbler obtain direct benefits by joining unrelated groups

The Journal of Animal Ecology
Frank GroenewoudJan Komdeur

Abstract

In many cooperatively breeding animals, a combination of ecological constraints and benefits of philopatry favours offspring taking a subordinate position on the natal territory instead of dispersing to breed independently. However, in many species individuals disperse to a subordinate position in a non-natal group ("subordinate between-group" dispersal), despite losing the kin-selected and nepotistic benefits of remaining in the natal group. It is unclear which social, genetic and ecological factors drive between-group dispersal. We aim to elucidate the adaptive significance of subordinate between-group dispersal by examining which factors promote such dispersal, whether subordinates gain improved ecological and social conditions by joining a non-natal group, and whether between-group dispersal results in increased lifetime reproductive success and survival. Using a long-term dataset on the cooperatively breeding Seychelles warbler (Acrocephalus sechellensis), we investigated how a suite of proximate factors (food availability, group composition, age and sex of focal individuals, population density) promote subordinate between-group dispersal by comparing such dispersers with subordinates that dispersed to a dominant position ...Continue Reading

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Citations

Oct 4, 2019·Behavioral Ecology : Official Journal of the International Society for Behavioral Ecology·Sara Raj PantDavid S Richardson
Dec 17, 2020·Proceedings. Biological Sciences·Laurence CousseauLuc Lens
Oct 28, 2021·The Journal of Animal Ecology·Michela BusanaHannah L Dugdale

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