Our review focused on plants, but several recently published
studies suggest that the basic biogeographical principles
outlined here apply across a wide range of taxa, including
plants and various groups of animals (Chown
et al.
, 1998; Sax,
2001; Sax
et al.
, 2002; Sax & Gaines, 2003). The absence of
common definitions of naturalization and invasion for all taxa
is hampering further generalization and the identification of
important contrasts between taxa