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Behavioral Ecology Advance Access originally published online on August 13, 2009
Behavioral Ecology 2009 20(5):1138-1146; doi:10.1093/beheco/arp108
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© The Author 2009. Published by Oxford University Press on behalf of the International Society for Behavioral Ecology. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

The cost of virulence: an experimental study of egg eviction by brood parasitic chicks

Tomás Grima, Jarkko Rutilab, Phillip Casseyb and Mark E. Hauberc

a Department of Zoology and Laboratory of Ornithology, Palacky University, tr. Svobody 26, CZ-771 46 Olomouc, Czech Republic b Centre for Ornithology, School of Biosciences, University of Birmingham, Edgbaston, B152TT UK c Department of Psychology, Hunter College, City University of New York, New York, NY 10065 USA

Address correspondence to M.E. Hauber. E-mail: mark.hauber{at}hunter.cuny.edu.


  Abstract

Hatchlings of some virulent brood parasitic birds have evolved to eliminate host offspring. We experimentally studied the dynamics and potential costs of the egg eviction behavior of hatchlings of the common cuckoo Cuculus canorus in broods of common redstarts Phoenicurus phoenicurus, a cavity nesting host. Eliminating the labor of egg tossing per se improved the cuckoo chick's growth during the eviction period by ~20–30%. Evictor cuckoo chicks recovered from the cost of egg tossing to fledge at similar masses compared with solitary chicks, although they did so at older ages. Foster parents fed evictor chicks less often compared with nonevictors. Feeding frequencies by hosts to evictors correlated negatively with eviction effort as evicting chicks often appeared to ignore fosterers offering food. Nest cup steepness was negatively related to eviction success and positively to age at first eviction. We propose that eviction behavior by cuckoo hatchlings is favored by selection because the costs of eviction are much lower than the costs of cohabitation with host chicks.

Key words: arms race, coevolution, host–parasite interactions.

Received 19 January 2009; revised 26 May 2009; accepted 21 June 2009.


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