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Roads as Corridors for Invasive Plant Species: New Evidence from Smooth Bedstraw (Galium mollugo)

Published online by Cambridge University Press:  20 January 2017

Geneviève Meunier  and
Claude Lavoie
Geneviève Meunier
Affiliation:
École Supérieure d'Aménagement du Territoire et de Développement Régional, Université Laval, Quebec City, QC G1A 0V6, Canada
Claude Lavoie*
Affiliation:
École Supérieure d'Aménagement du Territoire et de Développement Régional, Université Laval, Quebec City, QC G1A 0V6, Canada
*
Corresponding author's E-mail: claude.lavoie@esad.ulaval.ca
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Abstract

Roads function as prime habitats and corridors for invasive plant species, and can contribute significantly to the spread and establishment of weeds inside protected areas. Smooth bedstraw (Galium mollugo) populations have recently expanded in the abandoned agricultural fields of Bic National Park (Quebec, Canada), and may represent a threat to the preservation of plant diversity and to the quality of visitor experience. The main objective of this study was to map the distribution of the species in the park and to delineate factors influencing the abundance of the plant in fallow fields. We hypothesized that road proximity was the main factor explaining the presence and abundance (frequency of recording) of smooth bedstraw in fields. Vegetation surveys were conducted in abandoned agricultural fields, and two logistic regression models were built to examine the relationship between the presence and abundance of smooth bedstraw and environmental and historical variables. Smooth bedstraw populations were also mapped along transportation corridors. The abundance of smooth bedstraw significantly increases within 125 m (410 ft) of a paved road. The recent proliferation of smooth bedstraw in Bic National Park is likely associated with the construction of road embankments during the paving of gravel roads. The paved road network has probably acted as a dispersal corridor for smooth bedstraw, while the abandoned agricultural fields located close to the paved roads provided suitable habitats facilitating population establishment over large areas. We recommended to the park's authorities to cease paving all remaining gravel roads in the park, not only to stop smooth bedstraw invasion, but also the spread of other invasive species of concern.

Keywords

Smooth bedstraw, Galium mollugo L.Abandoned agricultural fieldparkpavingQuebecroad typeroadside
Type
Research
Information
Invasive Plant Science and Management , Volume 5 , Issue 1 , March 2012 , pp. 92 - 100
Copyright
Copyright © Weed Science Society of America 

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