the world we live in today has a history ecology and

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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) Historical biogeography 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 Dispersal Explain the distribution of organisms or species on any scale, local to glo bal, prior to plate tectonics 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) produce many, larvae in plankton only o Lecithotrophic (non-feeding) larvae: most have limited disp...
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