08Ch23Speciation2008

08Ch23Speciation2008 - 2007-2008AP BiologyMom, DadTheres...

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Unformatted text preview: 2007-2008AP BiologyMom, DadTheres something you need to knowIm a MAMMAL!The Origin of SpeciesAP BiologyThat mystery of mysteriesDarwin never actually tackled how new species aroseBoth in space and time, we seem to be brought somewhat near to that great factthatmystery ofmysteriesthe first appearance of new beings on this Earth.AP BiologySowhat is a species?Biological species conceptdefined by Ernst Mayrpopulation whose members can interbreed & produce viable, fertile offspringreproductively compatibleWestern MeadowlarkEastern MeadowlarkDistinct species:songs & behaviors are different enough to prevent interbreedingAP BiologyHow and why do new species originate?Species are created by a series of evolutionary processespopulations become isolatedgeographically isolated reproductively isolatedisolated populations evolve independentlyIsolationallopatricgeographic separationsympatricstill live in same areaAP BiologyObstacle to mating or to fertilization if mating occursPRE-reproduction barriersbehavioral isolationgeographic isolationecological isolationtemporal isolationmechanical isolationgametic isolationAP BiologyGeographic isolationSpecies occur in different areasphysical barrierallopatric speciationother countryHarriss antelope squirrel inhabits the canyons south rim (L). Just a few miles away on the north rim (R) lives the closely related white-tailed antelope squirrel Ammospermophilus sppAP BiologyEcological isolationSpecies occur in same region, but occupy different habitats so rarelyencounter each other...
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08Ch23Speciation2008 - 2007-2008AP BiologyMom, DadTheres...

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