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Shift in ecological strategy helps marginal populations of shepherd's purse (Capsella bursa-pastoris) to overcome a high genetic load

The outcome of species range expansion depends on the interplay of demographic, environmental and genetic factors. Self-fertilizing species usually show a higher invasive ability than outcrossers but selfing and bottlenecks during colonization also lead to an increased genetic load. The relationship...

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Autores principales: Orsucci, Marion, Milesi, Pascal, Hansen, Johanna, Girodolle, Johanna, Glémin, Sylvain, Lascoux, Martin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7287375/
https://www.ncbi.nlm.nih.gov/pubmed/32429810
http://dx.doi.org/10.1098/rspb.2020.0463
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author Orsucci, Marion
Milesi, Pascal
Hansen, Johanna
Girodolle, Johanna
Glémin, Sylvain
Lascoux, Martin
author_facet Orsucci, Marion
Milesi, Pascal
Hansen, Johanna
Girodolle, Johanna
Glémin, Sylvain
Lascoux, Martin
author_sort Orsucci, Marion
collection PubMed
description The outcome of species range expansion depends on the interplay of demographic, environmental and genetic factors. Self-fertilizing species usually show a higher invasive ability than outcrossers but selfing and bottlenecks during colonization also lead to an increased genetic load. The relationship between genomic and phenotypic characteristics of expanding populations has, hitherto, rarely been tested experimentally. We analysed how accessions of the shepherd's purse, Capsella bursa-pastoris, from the colonization front or from the core of the natural range performed under increasing density of competitors. First, accessions from the front showed a lower fitness than those from the core. Second, for all accessions, competitor density impacted negatively both vegetative growth and fruit production. However, despite their higher genetic load and lower absolute performances, accessions from the front were less affected by competition than accessions from the core. This seems to be due to phenotypic trade-offs and a shift in phenology that allow accessions from the front to avoid competition.
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spelling pubmed-72873752020-06-12 Shift in ecological strategy helps marginal populations of shepherd's purse (Capsella bursa-pastoris) to overcome a high genetic load Orsucci, Marion Milesi, Pascal Hansen, Johanna Girodolle, Johanna Glémin, Sylvain Lascoux, Martin Proc Biol Sci Evolution The outcome of species range expansion depends on the interplay of demographic, environmental and genetic factors. Self-fertilizing species usually show a higher invasive ability than outcrossers but selfing and bottlenecks during colonization also lead to an increased genetic load. The relationship between genomic and phenotypic characteristics of expanding populations has, hitherto, rarely been tested experimentally. We analysed how accessions of the shepherd's purse, Capsella bursa-pastoris, from the colonization front or from the core of the natural range performed under increasing density of competitors. First, accessions from the front showed a lower fitness than those from the core. Second, for all accessions, competitor density impacted negatively both vegetative growth and fruit production. However, despite their higher genetic load and lower absolute performances, accessions from the front were less affected by competition than accessions from the core. This seems to be due to phenotypic trade-offs and a shift in phenology that allow accessions from the front to avoid competition. The Royal Society 2020-05-27 2020-05-20 /pmc/articles/PMC7287375/ /pubmed/32429810 http://dx.doi.org/10.1098/rspb.2020.0463 Text en © 2020 The Authors. http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/http://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Evolution
Orsucci, Marion
Milesi, Pascal
Hansen, Johanna
Girodolle, Johanna
Glémin, Sylvain
Lascoux, Martin
Shift in ecological strategy helps marginal populations of shepherd's purse (Capsella bursa-pastoris) to overcome a high genetic load
title Shift in ecological strategy helps marginal populations of shepherd's purse (Capsella bursa-pastoris) to overcome a high genetic load
title_full Shift in ecological strategy helps marginal populations of shepherd's purse (Capsella bursa-pastoris) to overcome a high genetic load
title_fullStr Shift in ecological strategy helps marginal populations of shepherd's purse (Capsella bursa-pastoris) to overcome a high genetic load
title_full_unstemmed Shift in ecological strategy helps marginal populations of shepherd's purse (Capsella bursa-pastoris) to overcome a high genetic load
title_short Shift in ecological strategy helps marginal populations of shepherd's purse (Capsella bursa-pastoris) to overcome a high genetic load
title_sort shift in ecological strategy helps marginal populations of shepherd's purse (capsella bursa-pastoris) to overcome a high genetic load
topic Evolution
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7287375/
https://www.ncbi.nlm.nih.gov/pubmed/32429810
http://dx.doi.org/10.1098/rspb.2020.0463
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