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      Data from: Effects of admixture in native and invasive populations of Lythrum salicaria

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      Creators
      Shi, Jun
      Macel, M.
      Tielborger, K.
      Verhoeven, K.J.F.
      Date of Archiving
      2019
      Archive
      Dryad
      DOI
      https://doi.org/10.5061/dryad.tr69js8
      Related publications
      Effects of admixture in native and invasive populations of Lythrum salicaria  
      Publication type
      Dataset
      Access level
      Open access
      Please use this identifier to cite or link to this item: https://hdl.handle.net/2066/217722   https://hdl.handle.net/2066/217722
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      Organization
      Molecular Plant Physiology
      Audience(s)
      Biology
      Key words
      admixture; Lythrum salicaria; heterosis; Phenotypic Plasticity; inbreeding depression; biological invasions; Purple Loosestrife
      Abstract
      Intraspecific hybridization between diverged populations can enhance fitness via various genetic mechanisms. The benefits of such admixture have been proposed to be particularly relevant in biological invasions, when invasive populations originating from different source populations are found sympatrically. However, it remains poorly understood if admixture is an important contributor to plant invasive success and how admixture effects compare between invasive and native ranges. Here, we used experimental crosses in Lythrum salicaria, a species with well-established history of multiple introductions to Eastern North America, to quantify and compare admixture effects in native European and invasive North American populations. We observed heterosis in between-population crosses both in native and invasive ranges. However, invasive-range heterosis was restricted to crosses between two different Eastern and Western invasion fronts, whereas heterosis was absent in geographically distant crosses within a single large invasion front. Our results suggest that multiple introductions have led to already-admixed invasion fronts, such that experimental crosses do not further increase performance, but that contact between different invasion fronts further enhances fitness after admixture. Thus, intra-continental movement of invasive plants in their introduced range has the potential to boost invasiveness even in well-established and successfully spreading invasive species.
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