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The cost of prospecting for dispersal opportunities in a social bird

Kingma, S. A., Komdeur, J., Hammers, M. & Richardson, D. S., 1-Jun-2016, In : Biology Letters. 12, 6, 4 p., 20160316.

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Understanding why individuals delay dispersal and become subordinates within a group is central to studying the evolution of sociality. Hypotheses predict that dispersal decisions are influenced by costs of extra-territorial prospecting that are often required to find a breeding vacancy. Little is known about such costs, partly because it is complicated to demonstrate themempirically. For example, prospecting individuals may be of inferior quality already before prospecting and/or have been evicted. Moreover, costs of prospecting are mainly studied in species where prospectors suffer from predation risk, so how costly prospecting is when predators are absent remains unclear. Here, we determine a cost of prospecting for subordinate Seychelles warblers, Acrocephalus sechellensis, in a population where predators are absent and individuals return to their resident territory after prospecting. Prospecting individuals had 5.2% lower body mass than non-prospecting individuals. Our evidence suggests this may be owing to frequent attacks by resident conspecifics, likely leading to reduced food intake by prospectors. These results support the hypothesis that energetic costs associated with dispersal opportunities are one factor influencing dispersal decisions and shaping the evolution of delayed dispersal in social animals.

Original languageEnglish
Article number20160316
Number of pages4
JournalBiology Letters
Volume12
Issue number6
Publication statusPublished - 1-Jun-2016

    Keywords

  • cooperative breeding, benefits of philopatry, delayed dispersal, SEYCHELLES WARBLERS, POPULATION, EVOLUTION, MODEL

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