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Adaptive divergence and the evolution of hybrid trait mismatch in threespine stickleback Thompson, Ken; Chhina, Avneet; Schluter, Dolph
Description
<b>Abstract</b><br/>
Selection against mismatched traits in hybrids is the phenotypic analogue of intrinsic hybrid incompatibilities. Mismatch occurs when hybrids resemble one parent population for some phenotypic traits and the other parent population for other traits, and is caused by dominance in opposing directions or from segregation of alleles in recombinant hybrids. In this study, we used threespine stickleback fish (<i>Gasterosteus aculeatus</i> L.) to test the theoretical prediction that trait mismatch in hybrids should increase with the magnitude of phenotypic divergence between parent populations. We measured morphological traits in parents and hybrids in crosses between a marine population representing the ancestral form and twelve freshwater populations that have diverged from this ancestral state to varying degrees according to their environments. We found that trait mismatch was greater in more divergent crosses for both F<sub>1</sub> and F<sub>2</sub> hybrids. In the F<sub>1</sub> the divergence--mismatch relationship was caused by traits having dominance in different directions, whereas it was caused by increasing segregating phenotypic variation in the F<sub>2</sub>. Our results imply that extrinsic hybrid incompatibilities accumulate as phenotypic divergence proceeds.</p>; <b>Methods</b><br />
Full details are given in the open access paper.</p>; <b>Usage notes</b><br />
Full details are given in the readme.txt files.</p>
Item Metadata
| Title |
Adaptive divergence and the evolution of hybrid trait mismatch in threespine stickleback
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| Creator | |
| Date Issued |
2022-02-02
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| Description |
<b>Abstract</b><br/>
Selection against mismatched traits in hybrids is the phenotypic analogue of intrinsic hybrid incompatibilities. Mismatch occurs when hybrids resemble one parent population for some phenotypic traits and the other parent population for other traits, and is caused by dominance in opposing directions or from segregation of alleles in recombinant hybrids. In this study, we used threespine stickleback fish (<i>Gasterosteus aculeatus</i> L.) to test the theoretical prediction that trait mismatch in hybrids should increase with the magnitude of phenotypic divergence between parent populations. We measured morphological traits in parents and hybrids in crosses between a marine population representing the ancestral form and twelve freshwater populations that have diverged from this ancestral state to varying degrees according to their environments. We found that trait mismatch was greater in more divergent crosses for both F<sub>1</sub> and F<sub>2</sub> hybrids. In the F<sub>1</sub> the divergence--mismatch relationship was caused by traits having dominance in different directions, whereas it was caused by increasing segregating phenotypic variation in the F<sub>2</sub>. Our results imply that extrinsic hybrid incompatibilities accumulate as phenotypic divergence proceeds.</p>; <b>Methods</b><br /> Full details are given in the open access paper.</p>; <b>Usage notes</b><br /> Full details are given in the readme.txt files.</p> |
| Subject | |
| Type | |
| Notes |
Dryad version number: 3</p> Version status: submitted</p> Dryad curation status: Published</p> Sharing link: https://datadryad.org/stash/share/cPVaOaJElqdWOUzUzsMPG5LCaqEpMLGkcmOBq_D5KUg</p> Storage size: 7830656</p> Visibility: public</p> |
| Date Available |
2021-11-12
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| Provider |
University of British Columbia Library
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| License |
CC0 Waiver
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| DOI |
10.14288/1.0406461
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| URI | |
| Publisher DOI | |
| Rights URI | |
| Aggregated Source Repository |
Dataverse
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Licence
CC0 Waiver