Opposing patterns of intraspecific and interspecific differentiation in sex chromosomes and autosomes

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dc.contributor.author Moran, Peter A.
dc.contributor.author Pascoal, Sonia
dc.contributor.author Cezard, Timothee
dc.contributor.author Risse, Judith E.
dc.contributor.author Ritchie, Michael G.
dc.contributor.author Bailey, Nathan W.
dc.date.accessioned 2018-05-30T11:10:36Z
dc.date.available 2018-05-30T11:10:36Z
dc.date.issued 2018-05-22
dc.identifier.citation Moran, P. A., Pascoal, S. , Cezard, T. , Risse, J. E., Ritchie, M. G. and Bailey, N. W. (2018) ‘Opposing patterns of intraspecific and interspecific differentiation in sex chromosomes and autosomes’, Molecular Ecology. doi:10.1111/mec.14725 en
dc.identifier.issn 0962-1083
dc.identifier.issn 1365-294X
dc.identifier.uri http://hdl.handle.net/10468/6207
dc.identifier.doi 10.1111/mec.14725
dc.description.abstract Linking intraspecific and interspecific divergence is an important challenge in speciation research. X chromosomes are expected to evolve faster than autosomes and disproportionately contribute to reproductive barriers, and comparing genetic variation on X and autosomal markers within and between species can elucidate evolutionary processes that shape genome variation. We performed RADseq on a 16‐population transect of two closely‐related Australian cricket species, Teleogryllus commodus and T. oceanicus, covering allopatry and sympatry. This classic study system for sexual selection provides a rare exception to Haldane's rule, as hybrid females are sterile. We found no evidence of recent introgression, despite the fact that the species co‐exist in overlapping habitats in the wild and interbreed in the laboratory. Putative X‐linked loci showed greater differentiation between species compared to autosomal loci. However, population differentiation within species was unexpectedly lower on X‐linked markers than autosomal markers, and relative X‐to‐autosomal genetic diversity was inflated above neutral expectations. Populations of both species showed genomic signatures of recent population expansions, but these were not strong enough to account for the inflated X/A diversity. Instead, most of the excess polymorphism on the X could better be explained by sex‐biased processes that increase the relative effective population size of the X, such as interspecific variation in the strength of sexual selection among males. Taken together, the opposing patterns of diversity and differentiation at X versus autosomal loci implicate a greater role for sex‐linked genes in maintaining species boundaries in this system. en
dc.description.sponsorship Natural Environment Research Council (NE/G014906/1; NE/L011255/1) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher John Wiley & Sons, Inc. en
dc.rights © 2018, John Wiley & Sons Inc. This is the peer reviewed version of the following article: Moran, P. A., Pascoal, S. , Cezard, T. , Risse, J. E., Ritchie, M. G. and Bailey, N. W. (2018) ‘Opposing patterns of intraspecific and interspecific differentiation in sex chromosomes and autosomes’, Molecular Ecology. doi:10.1111/mec.14725, which has been published in final form at https://doi.org/10.1111/mec.14725. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. en
dc.subject Hybridisation en
dc.subject Faster X effect en
dc.subject Population genomics en
dc.subject RAD sequencing en
dc.subject Sex chromosomes en
dc.subject Teleogryllus en
dc.title Opposing patterns of intraspecific and interspecific differentiation in sex chromosomes and autosomes en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Peter Moran, Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland. T: +353-21-490-3000 E: peter.moran@gmail.com en
dc.internal.availability Full text available en
dc.check.info Access to this article is restricted until 12 months after publication by request of the publisher. en
dc.check.date 2019-05-22
dc.description.version Accepted Version en
dc.contributor.funder Natural Environment Research Council en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Molecular Ecology en
dc.internal.bibliocheck In press. Check for vol. / issue / page numbers. Amend citation as necessary.


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