The role of parent–offspring interactions during and after fledging in the Black-legged Kittiwake |
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Authors: | Hervé Mulard Étienne Danchin |
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Institution: | 1. Laboratoire d’Écologie, UMR 7625, Université Pierre et Marie Curie, 7 Quai Saint-Bernard, Case 237, 75005 Paris, France;2. Konrad Lorenz Institute for Ethology, Austrian Academy of Science, Savoyenstrasse 1a, 1160 Vienna, Austria |
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Abstract: | Most bird species endure a high mortality at fledging, and selection should favour parental behaviour diminishing these costs. Post-fledging parental care varies greatly among species and is often linked to parent–offspring recognition. In the Black-legged Kittiwake (Rissa tridactyla), fledglings need to return to the natal nest to be fed by their parents until independence. Rejections of fledglings by non-parent adults may be fairly violent, and parents are expected to recognize and help their chicks at the time of first return. However, previous cross-fostering experiments pointed out that parents are not able to recognize their chicks up to 15 days before fledging. In this paper, we study the behaviour of both parents and juveniles at fledging. We found that parents answered significantly more to their fledgling's calls than to those of others. Compared to silent juveniles, juveniles that called before landing were more likely to be accepted by their parents. No such pattern was observed with foreign juveniles, indicating that fledglings’ voice may carry individual identity. Furthermore, fledglings found their way back to the natal nest faster when parents attended the natal nest and reacted to their offspring's calls than when they were absent or inactive. Such interactions may therefore diminish juvenile mortality at fledging. |
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Keywords: | Black-legged Kittiwake Fledging Parent&ndash offspring recognition Post-fledging care Rissa tridactyla Vocal signature |
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