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Unformatted text preview: l the whole story . . .
The world we live in today has a history
Ecology and biogeography of today can only be partly explained by modern controls
(biotic and abiotic)
How organisms got to be where they are today
Two primary mechanisms to account for current biogeographic distribution, and how this
distribution has changed over time: dispersal and vicariance
Explain the distribution of organisms or species on any scale, local to glo bal, prior to
Can involve the active movement of organisms themselves or movement of fluid
environment carrying organisms along passively
Body size an important factor; dispersal can occur at different life stages
Marine vertebrates - usually disperse as adults (greater stamina)
Marine invertebrates - in general, they disperse as gametes or larvae, rather than
few, larger gametes; as adults (of larger size)
larvae in plankton only
o Lecithotrophic (non-feeding) larvae: most have limited disp...
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- Spring '08