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Prey body size mediates the predation risk associated with being "odd"

Morrell, Lesley J.; Downing, Beatrice; Rodgers, Gwendolen M.

Authors

Beatrice Downing

Gwendolen M. Rodgers

Abstract

Despite selection pressures on prey animals to maintain phenotypically homogeneous groups, variation in phenotype within animal groups is commonly observed. Although many prey animals preferentially associate with size-matched individuals, a lack of preference or a preference for nonmatching group mates is also commonly observed. We suggest that the assortative response to predation risk may be mediated by body size because larger bodied prey may be at greater risk of predation than smaller bodied prey when in a mixed group due to their greater potential profitability. We test this idea by observing attacks by three-spine sticklebacks Gasterosteus aculeatus on mixed groups of large and small Daphnia magna prey. We find that smaller Daphnia are at greatest risk when they form the majority of the group, whereas larger Daphnia are at the greatest predation risk when they form the minority. Thus, we predict that both large and small prey should benefit by association with large prey, generating a potential conflict over group membership that may lead to the mixed phenotype groups we observe in nature.

Journal Article Type Article
Publication Date 2015
Journal Behavioral ecology
Print ISSN 1045-2249
Electronic ISSN 1465-7279
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 26
Issue 1
Pages 242-246
Institution Citation Morrell, L. J., Downing, B., & Rodgers, G. M. (2015). Prey body size mediates the predation risk associated with being "odd". Behavioral ecology, 26(1), 242-246. doi:10.1093/beheco/aru185
DOI https://doi.org/10.1093/beheco/aru185
Keywords Assortment; Confusion effect; Group living; Oddity effect; Shoaling
Publisher URL http://beheco.oxfordjournals.org/content/26/1/242.full.pdf+html
Copyright Statement © 2015 University of Hull
Additional Information Author's accepted manuscript of article published in: Behavioral ecology, 2015, v.26, issue 1 at: http://beheco.oxfordjou...26/1/242.full.pdf+html.

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