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Unformatted text preview: l, physical, ecological, etc.
high mountain ranges, oceans, deserts, rivers Can change over lifetime (organism), and over geological time (species range). Corridors - relatively unobstructed routes of dispersal (terrestrial)
Dispersal can explain biogeographic distributions of many taxa:
-supposedly determined from the presence of the oldest and most
Originate at a "center of origin" primitive fossils, in addition to the greatest diversity of geologically
young species in a clade Expand outward from the center to colonize new habitats - occurs slowly, gradually to expand biogeographic range over geological time Successfully cross barriers
Diversification occurs as a result of adaptation to new habitats...
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- Spring '08