Potential limits to the benefits of admixture during biological invasion
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Barker, Brittany SCocio, Janelle E
Anderson, Samantha R
Braasch, Joseph E
Cang, Feng A
Gillette, Heather D
Dlugosch, Katrina M
Affiliation
Univ ArizonaIssue Date
2019-01-01Keywords
cytonuclear interactionsepistasis
genetic diversity
heterosis
invasiveness
multiple introductions
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WILEYCitation
Barker, BS, Cocio, JE, Anderson, SR, et al. Potential limits to the benefits of admixture during biological invasion. Mol Ecol. 2019; 28: 100– 113. https://doi.org/10.1111/mec.14958Journal
MOLECULAR ECOLOGYRights
© 2018 John Wiley & Sons Ltd.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Species introductions often bring together genetically divergent source populations, resulting in genetic admixture. This geographic reshuffling of diversity has the potential to generate favourable new genetic combinations, facilitating the establishment and invasive spread of introduced populations. Observational support for the superior performance of admixed introductions has been mixed, however, and the broad importance of admixture to invasion questioned. Under most underlying mechanisms, admixture's benefits should be expected to increase with greater divergence among and lower genetic diversity within source populations, though these effects have not been quantified in invaders. We experimentally crossed source populations differing in divergence in the invasive plant Centaurea solstitialis. Crosses resulted in many positive (heterotic) interactions, but fitness benefits declined and were ultimately negative at high source divergence, with patterns suggesting cytonuclear epistasis. We explored the literature to assess whether such negative epistatic interactions might be impeding admixture at high source population divergence. Admixed introductions reported for plants came from sources with a wide range of genetic variation, but were disproportionately absent where there was high genetic divergence among native populations. We conclude that while admixture is common in species introductions and often happens under conditions expected to be beneficial to invaders, these conditions may be constrained by predictable negative genetic interactions, potentially explaining conflicting evidence for admixture's benefits to invasion.Note
12 month embargo; published online: 28 November 2018ISSN
1365-294XPubMed ID
30485593Version
Final accepted manuscriptSponsors
National Institute of General Medical Sciences [K12GM000708]; National Institute of Food and Agriculture [2015-67013-23000, 2017-67011-26034]; Division of Integrative Organismal Systems [1750280]Additional Links
https://onlinelibrary.wiley.com/doi/full/10.1111/mec.14958ae974a485f413a2113503eed53cd6c53
10.1111/mec.14958
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