| The adaptive value of gluttony: predators mediate the life history trade-offs of satiation threshold. | |
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MedLine Citation:
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PMID: 20840307 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Animals vary greatly in their tendency to consume large meals. Yet, whether or how meal size influences fitness in wild populations is infrequently considered. Using a predator exclusion, mark-recapture experiment, we estimated selection on the amount of food accepted during an ad libitum feeding bout (hereafter termed 'satiation threshold') in the wolf spider Schizocosa ocreata. Individually marked, size-matched females of known satiation threshold were assigned to predator exclusion and predator inclusion treatments and tracked for a 40-day period. We also estimated the narrow-sense heritability of satiation threshold using dam-on-female-offspring regression. In the absence of predation, high satiation threshold was positively associated with larger and faster egg case production. However, these selective advantages were lost when predators were present. We estimated the heritability of satiation threshold to be 0.56. Taken together, our results suggest that satiation threshold can respond to selection and begets a life history trade-off in this system: high satiation threshold individuals tend to produce larger egg cases but also suffer increased susceptibility to predation. |
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Authors:
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J N Pruitt; J J Krauel |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of evolutionary biology Volume: 23 ISSN: 1420-9101 ISO Abbreviation: J. Evol. Biol. Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-09-15 Completed Date: 2010-12-28 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8809954 Medline TA: J Evol Biol Country: Switzerland |
Other Details:
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Languages: eng Pagination: 2104-11 Citation Subset: IM |
Copyright Information:
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© 2010 The Authors. Journal Compilation © 2010 European Society For Evolutionary Biology. |
Affiliation:
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Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN 37996-1610, USA. jpruitt6@utk.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Biological* Animals Feeding Behavior Female Food Chain Male Oviparity* Predatory Behavior Quantitative Trait, Heritable Satiation* Spiders / physiology* |
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