Evidence for Evolutio3

Evidence for Evolutio3 - replacing the species names with...

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Evidence for Evolution Biogeography The field of biogeography is concerned with the distribution of species in relation both to geography and to other species. Biogeography comprises two disciplines: historical biogeography, which is concerned with the origins and evolutionary histories of species on a long time scale, and ecological biogeography, which deals with the current interactions of species with their environments and each other on a much shorter time scale. Historical Biogeography Historical biogeographers depend heavily on evidence from other disciplines. Fossil records provide a large part of the information needed to determine distributions and past interactions. Molecular biology furnished historical biogeographers with molecular clocks, metabolic molecules whose change over time help track the relatedness of species. Historical biogeographers also make use of a tool called an area cladogram. This diagram is made by taking a taxonomic tree, which shows various species and their relatedness, and
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Unformatted text preview: replacing the species names with the geographic location in which those species are found. This new tree allows scientists to determine how the differences in environments have effected the evolutionary history of different species of common origin. A sample area cladogram is shown in . Comparative Anatomy The study of comparative anatomy predates the modern study of evolution. Early evolutionary scientists like Buffon and Lamarck used comparative anatomy to determine relationships between species. Organisms with similar structures, they argued, must have acquired these traits from a common ancestor. Today, comparative anatomy can serve as the first line of reasoning in determining the relatedness of species. However, there are many hidden dangers that make it necessary to support evidence from comparative anatomy with evidence from other fields of study....
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This note was uploaded on 01/27/2012 for the course BIOLOGY BSC1005 taught by Professor Rodriguez during the Winter '09 term at Broward College.

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Evidence for Evolutio3 - replacing the species names with...

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