ng available resources. However, field scientists observed that areas of high plant diversity may be invaded just as easily as areas of low diversity. Study sites were based in the Colorado Rockies, the Central Grasslands in Colorado, Wyoming, South Dakota, and Minnesota and included nine different vegetation types in both areas. This pattern was said to have been based on a complexity of issues, including plant cover, soil nitrogen availability, and total number of exotic species. Patterns of invasion, more importantly, depend on scale, ecosystem, vegetation type, availability of resources and responses to disturbance. Ecologists are always faced with new theories due to the complexity of natural ecosystems. When new theories arise, old ones are challenged. "It is humbling to note that community ecologists do not yet understand the causes and patterns of native species richness," says the head ecologist of the study, Thomas J. Stohlgren.

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Contact: Alison Gillespie, Public Affairs Officer
alison@esa.org
202-416-6181
Ecological Society of America
18-Feb-1999

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