Vicariance w speciation and extinction complications

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Unformatted text preview: arity nor the dissimilarity of the inhabitants of various regions can be wholly accounted for by climatal and other physical condi@ons.” 2.  “Barriers of any kind, or obstacles to free migra@on, are related in a close and important manner to the differences between the produc@ons [organisms] of various regions” 3.  “Inhabitants of the same con@nent or the same sea are related, although the species themselves differ from place to place.” Also  ­ Wallace EXAMPLE OF BIOGEOGRAPHIC AREAS – Major Patterns Wallace’s Line 14 4/9/13 Historical Factors  ­ Dispersal vs Vicariance •  Dispersal – Movement of individuals –  Two types: Range Expansion and Jump Dispersal –  Several types of dispersal mechanisms e.g., corridors, filter bridges, sweepstakes; (according to Simpson) –  Recent dispersals can be observed (i.e. 1883 Krakatoa erup@on killed all life, but within 50 years, island covered with forest inhabitants from Java/Sumatra) –...
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