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@Lecture05_9 - PALEOBIOLOGY Organismal species Naturally...

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1 1 Fall 2009, GEL 107: Lecture 05 PALEOBIOLOGY 2 Species and Speciation 3 A species A natural kind A man-made kind of anything 4 Organismal species Naturally defined group of organisms that reflects blood- relationships “Unit of evolution” 5 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 6 What is the biological species concept? What is the phylogenetic species concept? What is the evolutionary species concept? What are allopatric and sympatric speciation? So what is a species? What are cline and ring species? How does the time axis affect the concept? Questions 7 Groups of actually or potentially interbreeding populations, which are reproductively isolated from other such groups A definition Gene pool Gene flow 8 Restricted to sexually reproducing organisms Ambiguity in interbreeding “potential” Viable and fertile hybrids Problems Natural Condition 9 Hybrid zone
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2 10 Ligers 11 Tigons 12 http://www.barbarylion.com/All%20About%20Lions.htm Lion 13 http://hem.bredband.net/b270760/Korkeasaari/tigerkarta.htm Tiger 14 http://hem.bredband.net/b270760/Korkeasaari/tigerkarta.htm Tiger Lion 15 What is the biological species concept? What is the phylogenetic species concept?
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