eg gondwanaland breakup explain distribuon of ancient

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Unformatted text preview: or 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 14 4/12/13 EXAMPLE OF BIOGEOGRAPHIC AREAS – Major Patterns Wallace’s Line 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) –  Dispersal ability varies greatly (e.g., bats only mammals na?ve to New Zealand and Hawaii) •  Vicariance –  Disjunct paaerns = from changes imposed on originally con?nuous distribu?on (e.g., changes in distribu?on of land, by con?nental or tectonic shims, mountain ­building, river capture et...
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This note was uploaded on 02/02/2014 for the course ECOL 335 taught by Professor Reinthal during the Spring '10 term at University of Arizona- Tucson.

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