Nature\'s wonders (Introduction)

by David Turell , Friday, April 29, 2011, 14:07 (4753 days ago) @ dhw


> Once more, many thanks for these fascinating articles. As regards the second, the author refers to these as different species of pupfish. Are they really different species, or are they varieties? This causes immense confusion in the discussion of evolution, as pointed out by Leif A. Jensen. The question is whether varieties can or can't turn into new species, but it would seem from the article that all the pupfish remain pupfish. So whence cometh speciation?-Exactly, one of the major considerations. And also, how to define a species? When wolves and dogs are easily crossed. And think of ligers and tigrons!

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Nature\'s wonders - David Turell, 2009-08-11, 14:10
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        Nature\'s wonders - David Turell, 2011-04-27, 18:30
        Nature\'s wonders - dhw, 2011-04-29, 11:02
        Nature\'s wonders - David Turell, 2011-04-29, 14:07
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Nature\'s wonders (Introduction)