BIOL359 Lecture Notes - Lecture 20: Genetic Drift, Allopatric Speciation, Jellyfish
14 Apr 2016
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Document Summary
Biogeography: the study of how and why species are found where they are found. The laitudinal gradient as you move from poles to equator we see more species present. Phylogeography using phylogeneics to understand how populaions are related to each other. Variance an exising range is split by the appearance of a new physical barrier which may be as small as a road or as large as an ocean. Dispersal across a physical barrier followed by colonizaion of a new habitat, such as a when a group of organisms rides a rat of vegetaion to an island. Some organisms become isolated as the coninents have moved. Far less species in the atlanic than in the paciic ( paciic is much older) The reason why mammals interchanged one- sided is sill under speculaion but can be reasoned as: mammals can survive beter than other species, they can outcompete beter, but remember that this is all a speculaion based on fossil record.
