Abstract
Offspring solicit food from their parents by begging behaviours. Studies on birds suggest that these displays are 'honest signals of need' and adults provide food according to the begging level. However, siblings may compete for parental resources and the begging intensity is expected to change with brood size. Here, we show that in the black-headed gull (Larus ridibundus) an increase of the numbers of siblings can result in a decrease of individual begging cost through nestlings' synchronized signalling. This is in accordance with some mathematical models. As parents respond to the total solicitation emerging from the nest, the probability to get food increases with the number of chicks begging together. The more siblings there are, the more they coordinate their begging while decreasing the number of individual begging bouts. Intra-brood synchronization of begging enables chicks to reduce their effort and hence exerting an important role in parental-offspring negotiation.
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Selected References
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- Charrier I., Mathevon N., Jouventin P. Mother's voice recognition by seal pups. Nature. 2001 Aug 30;412(6850):873–873. doi: 10.1038/35091136. [DOI] [PubMed] [Google Scholar]
- Kedar H., Rodríguez-Gironés M. A., Yedvab S., Winkler D. W., Lotem A. Experimental evidence for offspring learning in parent-offspring communication. Proc Biol Sci. 2000 Sep 7;267(1454):1723–1727. doi: 10.1098/rspb.2000.1201. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Mathevon Nicolas, Charrier Isabelle, Jouventin Pierre. Potential for individual recognition in acoustic signals: a comparative study of two gulls with different nesting patterns. C R Biol. 2003 Mar;326(3):329–337. doi: 10.1016/s1631-0691(03)00072-6. [DOI] [PubMed] [Google Scholar]
- Rodríguez-Gironés M. A. Sibling competition stabilizes signalling resolution models of parent-offspring conflict. Proc Biol Sci. 1999 Dec 7;266(1436):2399–2402. doi: 10.1098/rspb.1999.0937. [DOI] [PMC free article] [PubMed] [Google Scholar]