Biology 2483A Lecture 22: Lec 22 Conservation Biology
3 Jan 2018
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Pigeons moved around in huge numbers, 5 billion in a flock. Extensively hunted, deforestation, other things that led to extinction but we don"t really know how a large population can all of a sudden go extinct. Usually extinction info comes from small islands where we can track and see the species end up in the vortex: biodiversity is declining globally. Some people claim that biologists are overestimating the number of species going extinct. Global summary of the number of documented imperiled species. Cf isle royale tutorial things go extinct. Other issue is since cambrian explosion (multicellular life), there has been both speciation and extinction. We can get a background on extinction rates alarming. Species life span = time of origin to time of extinction. The assumption of the species area relationship where they"re trying to estimate the number of species in a given area just by multiple sampling. They have found that the number of extinctions are alarming.
