Natural selection and outbreeding depression suggest adaptive differentiation in the invasive range of a clonal plant

Title
Natural selection and outbreeding depression suggest adaptive differentiation in the invasive range of a clonal plant
Publication Date
2018-07-11
Author(s)
Pantoja, Pauline O
Paine, C E Timothy
( author )
OrcID: https://orcid.org/0000-0001-8705-3719
Email: cpaine2@une.edu.au
UNE Id une-id:cpaine2
Vallejo-Marin, Mario
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
The Royal Society Publishing
Place of publication
United Kingdom
DOI
10.1098/rspb.2018.1091
UNE publication id
une:1959.11/27288
Abstract
Analyses of phenotypic selection and demography in field populations are powerful ways to establishing the potential role of natural selection in shaping evolution during biological invasions. Here we use experimental F₂ crosses between native and introduced populations of Mimulus guttatus to estimate the pattern of natural selection in part of its introduced range, and to seek evidence of outbreeding depression of colonists. The F₂s combined the genome of an introduced population with the genome of either native or introduced populations. We found that the introduced introduced cross had the fastest population growth rate owing to increased winter survival, clonality and seed production. Our analysis also revealed that selection through sexual fitness favoured large floral displays, large vegetative and flower size, lateral spread and early flowering. Our results indicate a source-of-origin effect, consistent with outbreeding depression exposed by mating between introduced and native populations. Our findings suggest that well-established non-native populations may pay a high fitness cost during subsequent bouts of admixture with native populations, and reveal that processes such as local adaptation in the invasive range can mediate the fitness consequences of admixture.
Link
Citation
Proceedings of the Royal Society B: Biological Sciences, 285(1882), p. 1-9
ISSN
1471-2954
0962-8452
Pubmed ID
30051824
Start page
1
End page
9
Rights
Attribution 4.0 International

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