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Title

Birds see the true colours of fruits to live off the fat of the land

AuthorsSchaefer, H. Martin; Valido, Alfredo CSIC ORCID ; Jordano, Pedro CSIC ORCID
KeywordsFood selection
Signal theory
Fair trade
Sensory ecology
Honest signalling
Seed dispersal
Communication
Mutualism
Issue Date2014
PublisherRoyal Society (Great Britain)
CitationProceedings of the Royal Society B: Biological Sciences 281 nº 1777 (2014)
AbstractCommunication is a characteristic of life, but its reliability and basic definition are hotly debated. Theory predicts that trade among mutualists requires high reliability. Here, we show that moderate reliability already allows mutualists to optimize their rewards. The colours of Mediterranean fleshy-fruits indicate lipid rewards (but not other nutrients) to avian seed dispersers on regional and local scales. On the regional scale, fruits with high lipid content were significantly darker and less chromatic than congeners with lower lipid content. On the local scale, two warbler species (Sylvia atricapilla and Sylvia borin) selected fruit colours that were less chromatic, and thereby maximized their intake of lipids-a critical resource during migration and wintering. Crucially, birds were able to maximize lipid rewards with moderate reliability from visual fruit colours (r2 1/4 0.44-0.60). We suggest that mutualisms require only that any association between the quality and sensory aspects of signallers is learned through multiple, repeated interactions. Because these conditions are often fulfilled, also in social communication systems, we contend that selection on reliability is less intense than hitherto assumed. This may contribute to explaining the extraordinary diversity of signals, including that of plant reproductive displays. © 2014 The Author(s) Published by the Royal Society. All rights reserved.
URIhttp://hdl.handle.net/10261/90149
DOI10.1098/rspb.2013.2516
Identifiersdoi: 10.1098/rspb.2013.2516
issn: 0962-8452
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