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A comparative analysis of vigilance in birds

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Abstract

Individual variation in vigilance is known to vary with factors such as group size but the ecological determinants of vigilance among species have not been examined thus far in a systematic fashion. Earlier analyses suggested that vigilance should be lower in larger species and in species living in larger groups. These analyses were based on a small number of species and failed to take into account phylogenetic relationships among species. Here, I examined ecological determinants of vigilance in a large sample of bird species using a phylogenetic framework. I focused on vigilance in foraging groups of birds in the non-breeding season. Among species, vigilance by solitary foragers was not influenced by body mass. However, among species, asymptotic vigilance, the plateau reached by vigilance in larger groups, decreased with increasing group size in vegetarian clades but not in carnivorous clades. Asymptotic vigilance also increased with increasing body mass in vegetarian clades but not in carnivorous clades. Increasing group size may allow species to reduce vigilance in response to decreased predation risk. Increasing body mass may allow species to increase vigilance because more non-foraging time is available in larger species. Diet may modulate the effect of body mass and group size through factors such as within-group vigilance or foraging techniques.

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Correspondence to Guy Beauchamp.

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Beauchamp, G. A comparative analysis of vigilance in birds. Evol Ecol 24, 1267–1276 (2010). https://doi.org/10.1007/s10682-010-9358-5

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