Hybridization increases invasive knotweed success

Parepa, Madalin; Fischer, Markus; Krebs, Christine; Bossdorf, Oliver (2014). Hybridization increases invasive knotweed success. Evolutionary applications, 7(3), pp. 413-420. Wiley 10.1111/eva.12139

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Hybridization is one of the fundamental mechanisms by which rapid evolution can occur in exotic species. If hybrids show increased vigour, this could significantly contribute to invasion success. Here, we compared the success of the two invasive knotweeds, Fallopia japonica and F.sachalinensis, and their hybrid, F.x bohemica, in competing against experimental communities of native plants. Using plant material from multiple clones of each taxon collected across a latitudinal gradient in Central Europe, we found that knotweed hybrids performed significantly better in competition with a native community and that they more strongly reduced the growth of the native plants. One of the parental species, F.sachalinensis, regenerated significantly less well from rhizomes, and this difference disappeared if activated carbon was added to the substrate, which suggests allelopathic inhibition of F.sachalinensis regeneration by native plants. We found substantial within-taxon variation in competitive success in all knotweed taxa, but variation was generally greatest in the hybrid. Interestingly, there was also significant variation within the genetically uniform F.japonica, possibly reflecting epigenetic differences. Our study shows that invasive knotweed hybrids are indeed more competitive than their parents and that hybridization increased the invasiveness of the exotic knotweed complex.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Ecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)
09 Interdisciplinary Units > Interdisciplinary Centre for General Ecology (IKAÖ)

UniBE Contributor:

Parepa, Madalin; Fischer, Markus; Krebs, Christine and Bossdorf, Oliver

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

1752-4571

Publisher:

Wiley

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

05 Jun 2014 12:19

Last Modified:

05 Jul 2017 16:56

Publisher DOI:

10.1111/eva.12139

Uncontrolled Keywords:

allelopathy, biological invasions, competitive ability, Fallopia, hybridization, invasiveness

BORIS DOI:

10.7892/boris.51830

URI:

https://boris.unibe.ch/id/eprint/51830

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