NDLI: Parental care of a cowbird host: caught between the costs of egg-removal and nest predation.

Content Provider	PubMed Central
Author	Tewksbury, Joshua J. Martin, Thomas E. Hejl, Sallie J. Kuehn, Michael J. Jenkins, J. Wajid
Abstract	Avian brood parasites reduce host fitness through the addition of parasitic eggs and the removal of host eggs. Both parasitic egg-addition and host egg-removal may be important sources of selection on host behaviour, creating fitness trade-offs with selection imposed by nest predation. However, the relative costs hosts suffer from egg-addition and host egg-removal and the responses to these costs are largely unstudied. Through experimental manipulations and observations, we demonstrate that increased nest attentiveness by female yellow warblers (Dendroica petechia) reduces the cost of brood parasitism by reducing egg-removal by brown-headed cowbirds (Molothrus ater). However, female attentiveness does not reduce the addition of parasitic eggs. Experimentally parasitized females respond to the threat of egg-removal by increasing nest attentiveness. Increased attentiveness, however, reduces time for females to gather food and requires males to visit the nest more often to feed incubating females. This increased activity in turn increases the risk of nest predation. Thus, brood parasitism (specifically egg-removal) and nest predation produce conflicting selection on incubation strategies, as parasitized hosts are caught between the costs of egg-removal by brood parasites, and the costs of increased nest predation if the female spends more time on the nest to reduce egg-removal.
Related Links	http://dx.doi.org/10.1098/rspb.2001.1894
Ending Page	429
Page Count	7
Starting Page	423
File Format	PDF
ISSN	09628452
e-ISSN	14712954
Journal	Proceedings of the Royal Society B: Biological Sciences
Issue Number	1489
Volume Number	269
Language	English
Publisher Date	2002-02-22
Access Restriction	Open
Subject Keyword	Biochemistry, Genetics and Molecular Biology(all) Immunology and Microbiology(all) Agricultural and Biological Sciences(all) Environmental Science(all) Medicine(all) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Immunology and Microbiology Medicine Biochemistry, Genetics and Molecular Biology Environmental Science Agricultural and Biological Sciences

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