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Originally published as Genetics Published Articles Ahead of Print on January 21, 2007.

Genetics, Vol. 175, 1429-1440, March 2007, Copyright © 2007
doi:10.1534/genetics.106.066613

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The Genetic Structure of Drosophila ananassae Populations From Asia, Australia and Samoa

Malcolm D. Schug*,1, Shelly G. Smith*,{dagger}, Allison Tozier-Pearce* and Shane F. McEvey{ddagger}

* Department of Biology, University of North Carolina, Greensboro, North Carolina 27402, {dagger} Center for Human Genomics, Wake Forest University, Winston-Salem, North Carolina 27157 and {ddagger} Australian Museum, Sydney, New South Wales 2010, Australia

1 Corresponding author: Department of Biology, University of North Carolina, 301 Eberhart Bldg., Greensboro, NC 27402.
E-mail: mdschug{at}uncg.edu

Information about genetic structure and historical demography of natural populations is central to understanding how natural selection changes genomes. Drosophila ananassae is a widespread species occurring in geographically isolated or partially isolated populations and provides a unique opportunity to investigate population structure and molecular variation. We assayed microsatellite repeat-length variation among 13 populations of D. ananassae to assess the level of structure among the populations and to make inferences about their ancestry and historic biogeography. High levels of genetic structure are apparent among all populations, particularly in Australasia and the South Pacific, and patterns are consistent with the hypothesis that the ancestral populations are from Southeast Asia. Analysis of population structure and use of F-statistics and Bayesian analysis suggest that the range expansion of the species into the Pacific is complex, with multiple colonization events evident in some populations represented by lineages that show no evidence of recent admixture. The demographic patterns show isolation by distance among populations and population expansion within all populations. A morphologically distinct sister species, D. pallidosa, collected in Malololelei, Samoa, appears to be more closely related to some of the D. ananassae populations than many of the D. ananassae populations are to one another. The patterns of genotypic diversity suggest that many of the individuals that we sampled may be morphologically indistinguishable nascent species.






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Copyright © 2007 by the Genetics Society of America.