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vol. 176, no. 2 the american naturalist august 2010 Ecological Determinants of Mutation Load and Inbreeding
 

Summary: vol. 176, no. 2 the american naturalist august 2010
Ecological Determinants of Mutation Load and Inbreeding
Depression in Subdivided Populations
Aneil F. Agrawal*
Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, Ontario M5S 3B2, Canada
Submitted November 21, 2009; Accepted April 6, 2010; Electronically published June 14, 2010
Online enhancement: data file.
abstract: Population structure can dramatically alter mutation
load, but the magnitude and direction of this effect depend on
whether selection is soft or hard. The abstract nature of previous
load models obscured the importance of ecological details in deter-
mining the softness of selection. Under the more ecologically explicit
model used here, I show that genes related to intrinsic growth rate
tend to experience hard selection whereas those genes affecting com-
petitive ability experience softer selection. Although resource limi-
tation determines the strength of selection on competitive ability, it
only affects the softness of selection, and thus the load, of mutations
with pleiotropic effects on intrinsic growth rate. While competition
is typically considered necessary for soft selection, the model shows
that interspecific competition hardens selection and can thereby lead

  

Source: Agrawal, Aneil F. - Department of Ecology and Evolutionary Biology, University of Toronto

 

Collections: Environmental Sciences and Ecology