Abstract:
:A nest of begging chicks invites an intuitive explanation: needy chicks want to be fed and parents want to feed them. Surprisingly, however, in a quarter of species studied, parents ignore begging chicks. Furthermore, parents in some species even neglect smaller chicks that beg more, and preferentially feed the biggest chicks that beg less. This extreme variation across species, which contradicts predictions from theory, represents a major outstanding problem for the study of animal signalling. We analyse parent-offspring communication across 143 bird species, and show that this variation correlates with ecological differences. In predictable and good environments, chicks in worse condition beg more, and parents preferentially feed those chicks. In unpredictable and poor environments, parents pay less attention to begging, and instead rely on size cues or structural signals of quality. Overall, these results show how ecological variation can lead to different signalling systems being evolutionarily stable in different species.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Caro SM,Griffin AS,Hinde CA,West SAdoi
10.1038/ncomms10985subject
Has Abstractpub_date
2016-03-29 00:00:00pages
10985issn
2041-1723pii
ncomms10985journal_volume
7pub_type
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