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Data from: Genomic islands of divergence are not affected by geography of speciation in sunflowers. Renaut, Sebastien; Grassa, Christopher J.; Yeaman, Sam; Lai, Zhao; Kane, Nolan K.; Moyers, Brook T.; Bowers, John E.; Burke, John M.; Rieseberg, Loren H.

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Abstract
Genomic studies of speciation often report the presence of highly differentiated genomic regions interspersed within a milieu of weakly diverged loci. The formation of these speciation islands is generally attributed to reduced inter-population gene flow near loci under divergent selection, but few studies have critically evaluated this hypothesis. Here, we report on transcriptome scans among four recently diverged pairs of sunflower (Helianthus) species that vary in the geographical context of speciation. We find that genetic divergence is lower in sympatric and parapatric comparisons, consistent with a role for gene flow in eroding neutral differences. However, genomic islands of divergence are numerous and small in all comparisons, and contrary to expectations, island number and size are not significantly affected by levels of interspecific gene flow. Rather, island formation is strongly associated with reduced recombination rates. Overall, our results indicate that the functional architecture of genomes plays a larger role in shaping genomic divergence than does the geography of speciation.
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HA412_trinity_noAltSplice_400bpmin

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Title	Data from: Genomic islands of divergence are not affected by geography of speciation in sunflowers.
Creator	Renaut, Sebastien; Grassa, Christopher J.; Yeaman, Sam; Lai, Zhao; Kane, Nolan K.; Moyers, Brook T.; Bowers, John E.; Burke, John M.; Rieseberg, Loren H.
Date Issued	2021-05-19
Description	Abstract Genomic studies of speciation often report the presence of highly differentiated genomic regions interspersed within a milieu of weakly diverged loci. The formation of these speciation islands is generally attributed to reduced inter-population gene flow near loci under divergent selection, but few studies have critically evaluated this hypothesis. Here, we report on transcriptome scans among four recently diverged pairs of sunflower (Helianthus) species that vary in the geographical context of speciation. We find that genetic divergence is lower in sympatric and parapatric comparisons, consistent with a role for gene flow in eroding neutral differences. However, genomic islands of divergence are numerous and small in all comparisons, and contrary to expectations, island number and size are not significantly affected by levels of interspecific gene flow. Rather, island formation is strongly associated with reduced recombination rates. Overall, our results indicate that the functional architecture of genomes plays a larger role in shaping genomic divergence than does the geography of speciation.; Usage notes HA412_trinity_noAltSplice_400bpmin
Subject	Other; Genomic islands; selection; Helianthus; Adaptive protein evolution; transcriptome; Sympatry; Sympatry.; Allopatry
Type	Dataset
Notes	Dryad version number: 1 Version status: submitted Dryad curation status: Published Sharing link: https://datadryad.org/stash/share/t5kB58163__ZXmxNMPXq5czRDb7v9trVohrgHPCKtws</p> Storage size: 386860704 Visibility: public
Date Available	2020-06-24
Provider	University of British Columbia Library
License	CC0 1.0
DOI	10.14288/1.0397799
URI	https://doi.org/10.5683/SP2/M6XLJP
Publisher DOI	https://doi.org/10.5683/SP2/M6XLJP; https://doi.org/10.5061/dryad.9q1n4
Rights URI	http://creativecommons.org/publicdomain/zero/1.0
Aggregated Source Repository	Dataverse

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