Chapter 14 T2-T6 - Chapter 14 T2-T6 10:00:00 Topic#2...

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Chapter 14 T2-T6 30/01/2008 10:00:00 Topic #2 Species Concepts Many other species concepts exist o None are productive o Reproductive isolation plays an essential role Topic #3 Speciation Allopatric speciation – speciation resulting from physical geographic  seperation of two or more populations o Vicariance – large population divided by a barrier Mountains or canyons River changing its course Lake Drying Continental drift o Dispersal – colonizing remote area Flight Rafting – float across ocean on vegetation mats etc Hitchhiking – parasites, seeds, transported by other organisms,  etc o Geographic Barrier alone – does not a new species make Independent Evolution Necessary Genetic Drift or natural selection Sufficient for “isolation” Sympatric speciation – a new species originating within the midst of the  parent population o
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Chapter 14 T2-T6 - Chapter 14 T2-T6 10:00:00 Topic#2...

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