Invasions frequently continue long after dispersal corridors have been
well established. Six interrelated processes (changes in donor region
s, new donor regions, changes in recipient region, invasion windows, s
tochastic inoculation events, and dispersal vector changes) are examin
ed to explain this phenomenon. The combination of these processes make
s it difficult to forge a list of species from potential donor regions
that will never become successful invaders and, by extension, to thus
define the characteristics of species that have failed to invade. Pre
dictions relative which species will invade and when they will invade
can be improved by more detailed attention to these six categories of
interrelated processes that mediate invasion success. Copyright (C) 19
96 Elsevier Science Limited