Shift in ecological strategy helps marginal populations of shepherd's purse (Capsella bursa-pastoris) to overcome a high genetic load - Archive ouverte HAL Access content directly
Journal Articles Proceedings of the Royal Society B: Biological Sciences Year : 2020

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

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Marion Orsucci
  • Function : Correspondent author
Pascal Milesi
  • Function : Author
Johanna Girodolle
Martin Lascoux
  • Function : Correspondent author
  • PersonId : 1069959

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Abstract

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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hal-02798477 , version 1 (05-06-2020)

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Attribution - CC BY 4.0

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Marion Orsucci, Pascal Milesi, Johanna Hansen, Johanna Girodolle, Sylvain Glémin, et al.. Shift in ecological strategy helps marginal populations of shepherd's purse (Capsella bursa-pastoris) to overcome a high genetic load. Proceedings of the Royal Society B: Biological Sciences, 2020, 287 (1927), pp.20200463. ⟨10.1098/rspb.2020.0463⟩. ⟨hal-02798477⟩
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