| Influence of the indirect effects of guppies on life-history evolution in Rivulus hartii. | |
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MedLine Citation:
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PMID: 20015237 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Early theories of life-history evolution predict that increased predation on young/small individuals selects for delayed maturation and decreased reproductive effort, but such theory only considers changes in mortality. Predators reduce prey abundance and increase food to survivors. Theory that incorporates such indirect effects yields different predictions. Trinidadian killifish, Rivulus hartii, inhabit communities with and without guppies. Guppies prey on young Rivulus and Rivulus densities decline and growth rates increase when guppies are present. Prior work showed that Rivulus phenotypes from communities with guppies matured earlier and had higher fecundity, consistent with theories that incorporate indirect effects. Here we examined the genetic basis of these differences by rearing 2nd generation, laboratory-born Rivulus from sites with and without guppies under two food levels that match natural differences in growth. Many locality x food interactions were significant, often reversing the relationship between communities. Such interactions imply that there are fitness trade-offs associated with adaptation to high or low resource environments. On high food, Rivulus from localities with guppies matured earlier, produced many small eggs, and exhibited increased reproductive investment; these differences reversed on low food. Our results suggest that indirect effects mold Rivulus evolution and thereby highlight connections between community processes and evolutionary change. |
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Authors:
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Matthew R Walsh; David N Reznick |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2009-12-10 |
Journal Detail:
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Title: Evolution; international journal of organic evolution Volume: 64 ISSN: 1558-5646 ISO Abbreviation: Evolution Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-07-13 Completed Date: 2010-10-18 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0373224 Medline TA: Evolution Country: United States |
Other Details:
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Languages: eng Pagination: 1583-93 Citation Subset: IM |
Affiliation:
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Department of Biology, University of California, Riverside, California 92521, USA. matthew.walsh@yale.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Ecosystem* Evolution* Female Food Killifishes / genetics*, growth & development Male Multivariate Analysis Oviparity* Poecilia* Predatory Behavior |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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