Document Detail


Influence of the indirect effects of guppies on life-history evolution in Rivulus hartii.
MedLine Citation:
PMID:  20015237     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Matthew R Walsh; David N Reznick
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Publication Detail:
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:
Title:  Evolution; international journal of organic evolution     Volume:  64     ISSN:  1558-5646     ISO Abbreviation:  Evolution     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-07-13     Completed Date:  2010-10-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0373224     Medline TA:  Evolution     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1583-93     Citation Subset:  IM    
Affiliation:
Department of Biology, University of California, Riverside, California 92521, USA. matthew.walsh@yale.edu
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MeSH Terms
Descriptor/Qualifier:
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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