Species diversity- Global decline, local rise
MARK MAZER AND FREDRIKA MAZER (Wed, 11 Aug 2010 12:11:01 PDT)

us rare plant lovers any reason to be happy.

Further poking about found this paper:

http://macalester.edu/~davis/davisbioscience.pdf/
Biotic Globalization: Does Competition from Introduced Species Threaten
Biodiversity?
MARK A. DAVIS
The introduction of new predators and pathogens has caused numerous
well-documented extinctions of long-term resident species, particularly in
spatially restricted environments such as islands and lakes. However, there
are surprisingly few instances in which extinctions of resident species
can be attributed to competition from new species

Mar