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Unformatted text preview: 1 GEL107: PALEOBIOLOGY Lecture 5: Species & Speciation ht p:/ www.bio.miami.edu/~cmal ery/150/unity/c1x17b-finches.jpg A species A natural kind A man-made kind of anything Organismal Species Naturally defined group of organisms that reflects blood-relationships “Unit of evolution” I look at the term species as one arbitrarily given, for the sake of convenience, to a set of individuals closely resembling each others. Charles Darwin , quoted in the textbook What is biological species concept? What are allopatric and sympatric speciation? What is the evolutionary species concept? What are cline and ring species? Why can’t we use the biological species concept in paleontology? What is the phylogenetic species concept? So what is a species? Groups of actually or potentially interbreeding populations, which are reproductively isolated from other such groups Definition Gene pool Gene flow 2 Restricted to sexually reproducing organisms Ambiguity in interbreeding “potential” Viable and fertile hybrids Problems Hybrid zone Ligers Tigons http://www.barbarylion.com/Al %20About%20Lions.htm http://hem.bredband.net/b270760/Korkeasaari/tigerkarta.htm What is biological species concept? What are allopatric and sympatric speciation?...
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- Spring '09
- Evolution, cline