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Determinants of Chinese and European Privet (Ligustrum sinense and Ligustrum vulgare) Invasion and Likelihood of Further Invasion in Southern U.S. Forestlands

Published online by Cambridge University Press:  20 January 2017

Hsiao-Hsuan Wang  and
William E. Grant
Hsiao-Hsuan Wang*
Affiliation:
Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843
William E. Grant
Affiliation:
Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843
*
Corresponding author's E-mail: [email protected]
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Abstract

Chinese and European privets are among the most aggressive invasive shrubs in forestlands of the southern United States. We analyzed extensive field data collected by the U.S. Forest Service covering 12 states to identify potential determinants of invasion and to predict likelihood of further invasion under a variety of possible management strategies. Results of multiple logistic regression, which classified 75% of the field plots correctly with regard to species presence and absence, indicated probability of invasion is correlated positively with elevation, adjacency (within 300 m) to waterbodies, mean extreme maximum temperature, site productivity, species diversity, natural regeneration, wind disturbance, animal disturbance, and private land ownership and is correlated negatively with slope, stand age, site preparation, artificial regeneration, distance to the nearest road, fire disturbance, and public land ownership. Habitats most at risk to further invasion (likelihood of invasion > 10%) under current conditions occur throughout Mississippi, with a band stretching eastward across south-central Alabama, and in eastern Texas and western Louisiana. Invasion likelihoods could be reduced most by conversion to public land ownership, followed by site preparation, fire disturbance, artificial regeneration, and elimination of animal disturbance. While conversion of land ownership may be neither feasible nor desirable, this result emphasizes the opportunity for reducing the likelihood of invasions on private lands via increased use of selected management practices.

Keywords

Chinese privet, Ligustrum sinense Lour, European privet, Ligustrum vulgare L.Biodiversitybiological invasionshabitat qualityinvasive speciesmultiple logistic regression model
Type
Research
Information
Invasive Plant Science and Management , Volume 5 , Issue 4 , December 2012 , pp. 454 - 463
Copyright
Copyright © Weed Science Society of America 

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