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Journal of Heredity Advance Access originally published online on September 4, 2009
Journal of Heredity 2009 100(6):732-741; doi:10.1093/jhered/esp077
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© The American Genetic Association. 2009. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Original Articles

Genetic Differentiation among Wild Populations of Tribolium castaneum Estimated Using Microsatellite Markers

Douglas W. Drury, Ashley L. Siniard, and Michael J. Wade

From the Department of Biology, Indiana University, 1001 East Third Street, Bloomington, IN 47405

Address correspondence to Douglas W. Drury at the address above, or e-mail: ddrury{at}indiana.edu.

We report our characterization of the genetic variation within and differentiation among wild-collected populations of the red flour beetle, Tribolium castaneum, using microsatellite loci identified from its genome sequence. We find that global differentiation, estimated as the average FST across all loci and between all population pairs, is 0.180 (95% confidence intervals of 0.142 and 0.218). A majority of our pairwise population comparisons (>70%) were significant even though this species is considered an excellent colonizer by virtue of its pest status. Regional genetic variation between Tribolium populations is 2–3 times that observed in the fruit fly, Drosophila melanogaster. There was a weak positive correlation between genetic distance [FST/(1 – FST)] and geographic distance [ln(km)]; pairs of populations with the highest degree of genetic differentiation (FST > 0.29) have been shown to exhibit significant postzygotic reproductive isolation when crossed in previous studies. We discuss the possibility that local extinction and kin-structured colonization have increased the level of genetic differentiation between Tribolium populations.

Key Words: FST • genetic differentiation • isolation by distance • microsatellite • Tribolium castaneum

Corresponding Editor: Rob DeSalle

Received December 18, 2008
Revised July 27, 2009
Accepted August 2, 2009


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