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BIOGEOGRAPHY - toconvergent but unrelated(by definition...

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BIOGEOGRAPHY We have referred to pattern and process throughout different sections of this course. These concepts are central to the study of biogeography which, in turn, incorporates many of the topics in evolutionary biology. Biogeography often leads us to infer process from pattern . Biogeography is the study of the distributions of organisms in space and time . It can be studied with a focus on ecological factors that shape the distribution of organisms, or with a focus on the historical factors that have shaped the current distributions. Certain regions of the world have "Mediterranean climates" where ocean current and wind patterns hit the west coast of N and S continents (Medit. region, California coast, Chile coast, SW Africa coast). Similar climate has lead
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Unformatted text preview: toconvergent , but unrelated (by definition) types of plants. To make sense of these types of ecological patterns we require a phylogenetic (historical) perspective: we need to focus on monophyletic groups . The importance of a geographic scale was certainly appreciated by Darwin: the Galapagos finches were morphologically distinct and geographically distinct and there must be a connection. Moreover, the general view that speciation is a central phenomenon in evolution, and that most speciation is allopatric speciation assumes that geography plays a central role: some geographic feature divides a species range in two or more parts and over time speciation is achieved (details in later lectures)....
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