Northern Prairie Wildlife Research Center
Alien Plants Ranking System
A cooperative effort of the National Park Service,
The Alien Plants Ranking System (APRS) is a computer-implemented system to help land managers make difficult decisions concerning invasive nonnative plants. The management of invasive plants is difficult, expensive, and requires a long-term commitment. Therefore, land managers must focus their limited resources, targeting the species that cause major impacts or threats to resources within their management, or the species that impede attainment of management goals. APRS provides an analytical tool to separate the innocuous species from the invasive ones (typically around 10% of the nonnative species). APRS not only helps identify those species that currently impact a site, but also those that have a high potential do so in the future. Finally, the system addresses the feasibility of control of each species, enabling the manager to weigh the costs of control against the level of impact.
This system has been developed and tested primarily in grassland and prairie parks in the central United States. Using the system in other ecoregions may require modification. If you have comments or suggestions regarding any aspect of this ranking system, please direct them to Dr. Ron Hiebert (firstname.lastname@example.org.)
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The ranking system is based on:
Hiebert, R. D., and J. Stubbendieck. 1993. Handbook for ranking exotic plants for management and control. U.S. National Park Service Natural Resources Report NPS/NRMWRO/NRR-93/08.
For more information, see:
Hiebert, R. D. 1997. Prioritizing invasive plants and planning for management. pp. 195-212 in J. O. Luken and J. W. Thieret, Eds. Assessment and Management of Plant Invasions. Springer, New York.
This resource should be cited as:
APRS Implementation Team. 2000. Alien plants ranking system version 5.1. Jamestown, ND: Northern Prairie Wildlife Research Center Online. http://www.npwrc.usgs.gov/resource/literatr/aprs/index.htm (Version 30SEP2002).