Document Detail


The effects of competition on the strength and softness of selection.
MedLine Citation:
PMID:  23020134     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Deleterious alleles are constantly introduced into populations due to mutation. In subdivided populations, the impact of these mutations depends on the strength of selection as well as the softness of selection, that is, the extent to which fitness is governed by local rather than global competition. It is widely appreciated that the intensity and type of competition will affect selection on deleterious mutations but most empirical work has focused solely on the effects of competition on selection strength. However, competition has rarely been studied in the context of selection 'softness' even though competition is at the conceptual root of soft selection. All other things being equal, theory predicts that inter- and intraspecific competitions have opposing effects on the softness of selection. Using Drosophila melanogaster, we estimated the strength and softness of selection in a 'baseline' competitive environment as well as two additional competitive environments characterized by either additional intra- or interspecific competitors. We found that competitive environment had little effect on the average strength of selection. While the softness of selection was affected by the type of competition, the direction of change varied across tests of different genes, contrary to expectation. Although the 'hard/soft' selection paradigm implicitly assumes that all individuals are equally sensitive to the local competitive environment, we found this not to be the case. Wild-type individuals were more sensitive to changes in the genetic quality of their local competitors than mutant individuals.
Authors:
E K H Ho; A F Agrawal
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-1
Journal Detail:
Title:  Journal of evolutionary biology     Volume:  -     ISSN:  1420-9101     ISO Abbreviation:  J. Evol. Biol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8809954     Medline TA:  J Evol Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 The Authors. Journal of Evolutionary Biology © 2012 European Society For Evolutionary Biology.
Affiliation:
Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada.
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