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

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Moran_et_al_2018_Molecular_Ecology_Author_Version.pdf (1.894Mb)
Date
10/06/2018
Author
Moran, Peter
Pascoal, Sonia
Cezard, Timothee
Risse, Judith
Ritchie, Michael G.
Bailey, Nathan W.
Keywords
Hybridization
Faster-X effect
Population genomics
RAD sequencing
Sex chromosomes
Teleogryllus
GE Environmental Sciences
QH301 Biology
DAS
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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.
Citation
Moran , P , Pascoal , S , Cezard , T , Risse , J , Ritchie , M G & Bailey , N W 2018 , ' Opposing patterns of intraspecific and interspecific differentiation in sex chromosomes and autosomes ' , Molecular Ecology , vol. Early view . https://doi.org/10.1111/mec.14725
Publication
Molecular Ecology
Status
Peer reviewed
DOI
https://doi.org/10.1111/mec.14725
ISSN
0962-1083
Type
Journal article
Rights
© 2018 John Wiley & Sons Ltd. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1111/mec.14725
Description
Funding: Natural Environment Research Council grants to N.W.B., Grant/Award numbers: NE/G014906/1, NE/L011255/1; Orthopterists’ Society grant to P.A.M.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/17850

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