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Invasion of an Exotic Shrub into Forested Stands in an Agricultural Matrix

Published online by Cambridge University Press:  20 January 2017

David L. Gorchov*
Affiliation:
Department of Biology, Miami University, Oxford, OH 45056
Mary C. Henry
Affiliation:
Department of Geography, Miami University, Oxford, OH 45056
Peter A. Frank
Affiliation:
Department of Botany, Miami University, Oxford, OH 45056
*
Corresponding author's E-mail: GorchoDL@miamioh.edu

Abstract

We investigated the relative importance of stand and landscape characteristics in the invasion of a nonnative shrub, Amur honeysuckle, in 40 woodlots in an agricultural matrix in southwest Ohio. We quantified stand characteristics that could influence invasibility, the intrinsic susceptibility of an area to invasion, including woodlot size, perimeter-to-area ratio, tree basal area, and stand age. At the landscape scale we included factors that potentially influence propagule rain (the contribution of seeds from individuals established outside the focal area), including the land cover and road density in a 1,500-m buffer around each woodlot, as well as the extent to which the perimeter was forested at two points in the past, and latitude (based on an apparent south-to-north invasion in this region). Based on stepwise regression, we determined that honeysuckle cover was determined primarily by landscape parameters, particularly the percent of the buffer comprised of cropland. Woodlots surrounded by more cropland had less honeysuckle cover, which we attribute to paucity of nearby seed sources and/or minimal movement of seed-dispersing animals. From these findings, we argue that impediments to propagule rain are more important in shaping the invasion of this exotic shrub than are characteristics of the woodlots themselves, i.e., community invasibility.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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References

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