Nestling presence affects the anti-predator response of adult superb fairy-wrens (Malurus cyaneus) |
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Authors: | Diane Colombelli-Négrel Jeremy Robertson Sonia Kleindorfer |
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Institution: | (1) School of Biological Sciences, Flinders University, GPO Box 2100, Adelaide, 5001, Australia; |
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Abstract: | Nest predation accounts for the majority of nesting failure, and hence there has been strong selection on behaviour to reduce
nest predation, including patterns of nest defence. Here, we test risk-taking behaviour to experimentally placed predators
in the presence or absence of nestlings. We use the superb fairy-wren (Malurus cyaneus) to test the prediction that vigilance will be comparable with and without nestlings, but that alarm vocalisations will increase
when nestlings are present. We found support for both predictions. Adult vigilance of predators was comparable with and without
nestlings. Alarm vocalisation intensity was predicted by predator type and nestling presence, and was highest to the snake
model in the presence of nestlings. These results point to selection for differentiated nest defence response in relation
to predator type and the presence or absence of nestlings. |
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