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USGS To Present Diverse Research At ESA Annual Meeting


From Exotics To Hayfields

From native birds to exotic plants, USGS scientists will present diverse research at the annual meeting of The Ecological Society of America at the Baltimore Convention Center, Baltimore, Md., Aug. 2-7.

Special Invasive Species Workshop

It is said that non-native invasive species are the single greatest threat to American natural resources. Expansion of global trade and increasing movement of humans across boundaries underlie the spread of these exotics, which include miconia in Hawaii, gypsy moths in the eastern United States, leafy spurge throughout the western rangelands, and zebra mussels in the Great Lakes. This workshop is designed to bring together scientists, managers and policy-makers through presentations and open discussion.

("Invasive Species--Science, Management and Policy Options," Ann M. Bartuska, U.S. Forest Service, Wash., D.C., and Thomas Stohlgren, USGS, Fort Collins, Colo., organizers, Mon., Aug. 3, 10:15 a.m., room 341/342.)

Grazing Does Not Impact Species Variety

Contrary to popular wisdom, grazing does not increase plant species diversity for either native or invasive exotic species, according to a recent study. The study was conducted on randomly selected sample sites on and adjacent to grazed areas in Colorado, Wyoming, Montana, and South Dakota. The results suggest that disturbance of habitat by grazing animals does not speed the invasion of exotic weeds or produce a richer pattern of native species--at least not in Rocky Mountain grasslands. Rather, it appears that species variation is more a function of variation in natural habitat conditions. This finding has important implications for designing range management strategies and the role of grazing in such strategies.

("Does Grazing Really Increase Plant Species Richness and Enhance Invasion by Exotic Plants?" by Thomas J. Stohlgren, USGS, Fort Collins, Colo., and Lisa D. Schell and Brian
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Contact: Bob Reynolds
rreynold@usgs.gov
703-648-6829
United States Geological Survey
31-Jul-1998


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