Document Detail

Indirect predator effects on clutch size and the cost of egg production.
MedLine Citation:
PMID:  20528899     Owner:  NLM     Status:  MEDLINE    
Predator-induced changes in physiology and behaviour may negatively affect a prey's birth rate. Evidence of such indirect predator effects on prey demography remains scarce in birds and mammals despite invertebrate and aquatic studies that suggest ignoring such effects risks profoundly underestimating the total impact of predators. We report the first experimental demonstration of indirect predator effects on the annual 'birth' rate resulting from negative effects on the size of subsequent clutches laid by birds. We manipulated the probability of nest predation and measured the size of subsequent clutches and multiple indices of the mother's physiological condition, while controlling for food availability, date and stage of breeding. Females subject to frequent experimental nest predation laid smaller subsequent clutches and were in poorer physiological condition, particularly regarding non-resource-based indices (e.g. oxidative stress and glucocorticoid mobilization) consistent with both a response to the threat of predation and an increased cost of egg production.
Marc Travers; Michael Clinchy; Liana Zanette; Rudy Boonstra; Tony D Williams
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-05-26
Journal Detail:
Title:  Ecology letters     Volume:  13     ISSN:  1461-0248     ISO Abbreviation:  Ecol. Lett.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-07-16     Completed Date:  2010-10-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101121949     Medline TA:  Ecol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  980-8     Citation Subset:  IM    
Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A1S6, Canada.
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MeSH Terms
Clutch Size*
Nesting Behavior*
Population Dynamics
Predatory Behavior*
Reproduction / physiology*
Sparrows / physiology*

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