Testing for Asymmetrical Gene Flow in a Drosophila melanogaster Body-Size Cline

Testing for Asymmetrical Gene Flow in a Drosophila melanogaster Body-Size Cline

W. Jason Kennington^a, Julia Gockel^a, and Linda Partridge^a
^a Department of Biology, University College London, London WC1E 2BT, United Kingdom

Corresponding author: Linda Partridge, University College London, Darwin Bldg., Gower St., London WC1E 2BT, United Kingdom., l.partridge{at}ucl.ac.uk (E-mail)

Communicating editor: M. NOOR

Asymmetrical gene flow is an important, but rarely examinedgenetic parameter. Here, we develop a new method for detectingdepartures from symmetrical migration between two populationsusing microsatellite data that are based on the difference inthe proportion of private alleles. Application of this approachto data collected from wild-caught Drosophila melanogaster alonga latitudinal body-size cline in eastern Australia revealedthat asymmetrical gene flow could be detected, but was uncommon,nonlocalized, and occurred in both directions. We also showthat, in contrast to the findings of a previous study, thereis good evidence to suggest that the cline experiences significantlevels of gene flow between populations.

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