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MBE Advance Access originally published online on May 28, 2008
Molecular Biology and Evolution 2008 25(8):1728-1736; doi:10.1093/molbev/msn124
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Published by Oxford University Press 2008.

Research Articles

The Impact of Founder Events on Chromosomal Variability in Multiply Mating Species

John E. Pool and Rasmus Nielsen

Department of Integrative Biology, University of California, Berkeley

E-mail: jpool{at}berkeley.edu

Accepted for publication May 21, 2008.

In species with heterogametic males, the relative levels of X chromosome versus autosome diversity hold key information about the evolutionary forces at work in a population. It has been shown that population size changes alter the ratio of X linked to autosomal (X/A) variation, with population size reductions and recent bottlenecks leading to decreased X/A diversity ratios. Here we use theory and simulation to investigate a separate demographic effect—that of founder events involving multiply mated females—and find that it leads to much stronger reductions in X/A diversity ratios than are produced by simple population size changes. Investigating the potential of this process to account for sharply reduced X-linked diversity in European Drosophila melanogaster, we find that this model yields predictions that are compatible with the empirical data.

Key Words: founder events • multiple mating • X-linked variation • autosomal variation • Drosophila melanogaster

Jeffrey Thorne, Associate Editor


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