Gene-flow between niches facilitates local adaptation in sexual populations

Gray, Jeremy C. and Goddard, Matthew R. (2012) Gene-flow between niches facilitates local adaptation in sexual populations. Ecology Letters, 15 (9). pp. 955-962. ISSN 1461-023X

Full content URL: http://dx.doi.org/10.1111/j.1461-0248.2012.01814.x

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Gene-flow between niches facilitates local adaptation in sexual populations

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Abstract

In sexual populations, gene-flow between niches is predicted to have differential consequences on local adaptation contingent upon the nature of trade-offs underlying local adaptation. Sex retards local adaptation if antagonistic pleiotropy underlies trade-offs, but facilitates adaptation if mutation accumulation underlies trade-offs. We evaluate the effect of sex in heterogeneous environments by manipulating gene-flow between two niches in sexual and asexual populations using steady-state microcosm experiments with yeast. We find that only sex in the presence of gene-flow promotes simultaneous local adaptation to different niches, presumably as this exposes mutations neutrally accrued in alternate niches to selection. This finding aligns with work showing mutation accumulation underlies trade-offs to local adaptation in asexual microbes, and with inferences of divergence in the presence of gene-flow in natural sexual populations. This experiment shows that sex may be of benefit in heterogeneous environments, and thus helps explain why sex has been maintained more generally. Letter Letters © 2012 Blackwell Publishing Ltd/CNRS.

Keywords:adaptation, asexual reproduction, biological model, ecosystem, evolution, gene flow, genetics, growth, development and aging, letter, mutation, yeast, Adaptation, Biological, Biological Evolution, Models, Genetic, Reproduction, Asexual, Yeasts, Saccharomyces cerevisiae
Subjects:C Biological Sciences > C180 Ecology
C Biological Sciences > C400 Genetics
Divisions:College of Science > School of Life Sciences
ID Code:17151
Deposited On:15 May 2015 08:22

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