Geography Reference
In-Depth Information
Primary biogeographic homology ( figs. 2.4a and 2.4b ) is a conjecture
on a common biogeographic history, which means that different taxa, even
when they have completely different means of dispersal, are spatiotempor-
ally integrated in a biotic component (Morrone 2001c, 2004a). A panbiogeo-
graphic analysis allows comparison of individual tracks in order to detect
generalized tracks. In addition to sorting distributions of the analyzed taxa
into generalized tracks, it is possible to detect smaller units or areas of
endemism within them. Both areas of endemism and generalized tracks rep-
resent biotic components. Secondary biogeographic homology ( figs. 2.4c
and 2.4d ) is the cladistic test of the formerly recognized biotic components.
A cladistic biogeographic analysis allows one to compare area clado-
grams—obtained by replacing terminal taxa in taxon-area cladograms by
the areas of endemism they inhabit—in order to obtain a general area clado-
gram.
Figure 2.4 Biogeographic homology. (a, b) Primary biogeographic homology, with
biotic components drawn as generalized tracks; (c, d) secondary biogeographic ho-
mology (general area cladograms): (c) the general area cladogram corroborates the
 
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