interesting question. This bears upon it a bit http://www.wienslab.com/Publications_files/HuaWiens2013_AmNat.pdf …
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I think this is an open question in biology, though there are interesting theories. Nick Lane's books are worth a read.
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Um extinction event, no? There have been half a dozen IIRC.
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sufficient, necessary or both?
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Two ideas I've heard: -High energy flux -Network of similar niches w/semi-permeable barriers between
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comes to mind: highly distinct niches; intense radiation/mutation; fast reproduction cycles; frequent boom and bust cycles
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KSR's Aurora provides fascinating acct of zoo codevolution/island biogeography in an interstellar voyage. Meticulously researched
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invasive species arriving in an environment with lots of distinct niches
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A greater number of niches will make a greater diversity of traits more or less viable somewhere.
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