Lect 4 Biogeography Summer 2009

Lect 4 Biogeography Summer 2009 - Biogeography The study of...

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Biogeography The study of the distribution of species on earth, on both long and short time scales. Why are species found where they are? What are the physical factors that influence the current distribution of species? How does the distribution of a species reflect its evolutionary history? What historical factors were important in the distribution of species?
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Historical Biogeography Relates evolution and earth history in explaining the distributions of organisms. Typically based on phylogenetic work. Continental movements are critical in determining the current distributions of many species. Vicariant events involve the formation of a barrier that separates a previously continuous range of distribution into two or more pieces. Dispersal events involve colonization of new habitat.
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Biogeography Vicariance and dispersal account for the presence of a species in multiple locations Vicariance – change in the environment Physical barrier arises within the range of a species Example – reindeer (Northern Europe and Asia) and caribou (North America) are a single species that was divided into separate populations by submergence of
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Lect 4 Biogeography Summer 2009 - Biogeography The study of...

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