Species’ invasions have long been regarded as enormously complex processes, so complex as to defy
predictivity. Phases of this process, however, are emerging as highly predictable: the potential geographic
course of an invasion can be anticipated with high precision based on the ecological niche characteristics
of a species in its native geographic distributional area. This predictivity depends on the premise that
ecological niches constitute long-term stable constraints on the potential geographic distributions of
species, for which a sizeable body of evidence is accumulating. Hence, although the entire invasion
process is indeed complex, the geographic course that invasions are able to take can be anticipated with considerable confidence.
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