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Type: Journal article
Title: A genome scan and linkage disequilibrium analysis among chromosomal races of the Australian grasshopper Vandiemenella viatica
Author: Jackson, B.
Kawakami, T.
Cooper, S.
Galindo, J.
Butlin, R.
Citation: PLoS One, 2012; 7(10):1-10
Publisher: Public Library of Science
Issue Date: 2012
ISSN: 1932-6203
Editor: Etges, W.J.
Statement of
Ben Jackson, Takeshi Kawakami, Steve Cooper, Juan Galindo and Roger Butlin
Abstract: In the past decade the interest surrounding the role of recombination in speciation has been re-kindled by a new generation of chromosomal speciation models that invoke the recombination-suppression properties of some types of chromosomal rearrangement. A common prediction of recombination-suppression models is that gene exchange between diverging populations will be more restricted in regions of the genome that experience low recombination. We carried out a genome scan of three chromosomal races of the grasshopper Vandiemenella viatica (Orthoptera: Morabinae), occurring on Kangaroo Island, South Australia, using 1517 AFLP loci, with a view to elucidating the roles that selection and chromosomal variation have played in the formation of these taxa. An analysis of molecular variance demonstrated that chromosomal race accounted for a significant proportion of the genetic variance in the total dataset, which concurred with the findings of an earlier study. Sampling across one previously-identified hybrid zone, and the identification of outlier loci between parental races allowed us to establish that, in admixed populations, outlier loci which potentially pre-date the isolation of populations of races on Kangaroo Island exhibit higher levels of linkage disequilibrium with each other than putatively neutral loci. In turn this suggests that they might reside within genomic regions of low recombination, or be closely linked with each other.
Keywords: Chromosomes
Genetics, Population
Species Specificity
Linkage Disequilibrium
South Australia
Genetic Speciation
Amplified Fragment Length Polymorphism Analysis
Genetic Variation
Rights: Copyright:© 2012 Jackson et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
DOI: 10.1371/journal.pone.0047549
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Appears in Collections:Aurora harvest
Earth and Environmental Sciences publications
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