Biology Reference
In-Depth Information
Fig. 2.31
Variation in relative pathway importance among small islands (solid bars), large islands
(open bars), and continents (diagonally hatched bars) across all introductions
Fig. 2.32
Variation in relative pathway importance among small islands (solid bars), large islands
(open bars), and continents (diagonally hatched bars) only for those species having successfully
established populations
Alternatively, species from continents may more often be introduced to a wider
variety of habitats, thereby decreasing their probability of successful colonization.
Second, it may be that species native to insular regions are ecologically and physio-
logically preadapted for successful colonization, giving them a relative edge over
species from continental areas. These hypotheses are not mutually exclusive.
Lastly, growth in importance of the major source areas for introduced species is
similar to that seen in earlier figures, although it is not so consistently exponential
as seen for the other cumulative growth patterns (Fig. 2.35). Such exponential
