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  The effect of hybrid transgression on environmental tolerance in experimental yeast crosses.

Stelkens, R. B., Brockhurst, M. A., Hurst, G. D. D., Miller, E. L., & Greig, D. (2014). The effect of hybrid transgression on environmental tolerance in experimental yeast crosses. Journal of Evolutionary Biology, 27(11), 2507-2519. doi:10.1111/jeb.12494.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0023-E7AF-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0025-05B6-8
Genre: Journal Article

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Stelkens_et_al_2014.pdf (Publisher version), 466KB
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 Creators:
Stelkens, R. B.1, Author              
Brockhurst, M. A., Author
Hurst, G. D. D., Author
Miller, E. L.1, Author              
Greig, D.1, Author              
Affiliations:
1Max-Planck Research Group Experimental Evolution, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445640              

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Free keywords: environmental clines; hybridization; relative fitness; Saccharomyces; speciation; transgressive segregation
 Abstract: Evidence is rapidly accumulating that hybridization generates adaptive variation. Transgressive segregation in hybrids could promote the colonization of new environments. Here, we use an assay to select hybrid genotypes that can proliferate in environmental conditions beyond the conditions tolerated by their parents, and we directly compete them against parental genotypes in habitats across environmental clines. We made 45 different hybrid swarms by crossing yeast strains (both Saccharomyces cerevisiae and S. paradoxus) with different genetic and phenotypic divergence. We compared the ability of hybrids and parents to colonize seven types of increasingly extreme environmental clines, representing both natural and novel challenges (mimicking pollution events). We found that a significant majority of hybrids had greater environmental ranges compared to the average of both their parents’ ranges (mid-parent transgression), but only a minority of hybrids had ranges exceeding their best parent (best-parent transgression). Transgression was affected by the specific strains involved in the cross and by the test environment. Genetic and phenotypic crossing distance predicted the extent of transgression in only two of the seven environments. We isolated a set of potentially transgressive hybrids selected at the extreme ends of the clines and found that many could directly outcompete their parents across whole clines and were between 1.5- and 3-fold fitter on average. Saccharomyces yeast is a good model for quantitative and replicable experimental speciation studies, which may be useful in a world where hybridization is becoming increasingly common due to the relocation of plants and animals by humans.

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Language(s): eng - English
 Dates: 2014-08-222014-05-232014-09-012014-09-282014-11
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1111/jeb.12494
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Title: Journal of Evolutionary Biology
  Other : J. Evol. Biol.
Source Genre: Journal
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Publ. Info: Basel, Switzerland : Birkhäuser
Pages: - Volume / Issue: 27 (11) Sequence Number: - Start / End Page: 2507 - 2519 Identifier: ISSN: 1010-061X (print)
ISSN: 1420-9101 (online)
CoNE: /journals/resource/954925584241