AS.270.103 Lecture Notes - Lecture 14: Species Pool, Species Richness, Beta Diversity
23 Jan 2017
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Biogeography wants to understand why a certain species live in a certain region: why are some species widely distributed while others have more restricted ranges, ho(cid:449) does a spe(cid:272)ies" e(cid:448)olutio(cid:374)ary history affect its current distribution, historical perspective. The history of life is an increase in species diversity; as different species evolve to utilize different niches, speciation occurs. The upward trend in species richness has been punctuated by catastrophic events that lead to extinctions. Makes way for adaptive radiation and really fast diversification of species (i. e. mammals exploited the space left over by the extinction of dinosaurs) Geological history biogeographic realms, generally delineated by tectonic plates, contain their own flora and fauna (attributed to alfred. Relates to how the continents were once connected and then disconnected. Use molecular data to construct an evolutionary tree that compares closely related species, which belong to the same general taxa, but are distributed among many different continents.
