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Adaptation - Click to edit Master subtitle style How is...

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Click to edit Master subtitle style 12/9/09
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12/9/09 How is Species Formed?? I. Mechanisms of Speciation A. Allopatric speciation geographic speciation new species formed after geographic separation of a once continuous population. Change can be sudden or gradual: Leads to reproductive isolation
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12/9/09 A A 2 A 1 C B B C Species A starts at the north end of the range B and C are true species at the south end of the range A 1 A A 2 A Insipient species Species breakdown returns to A
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12/9/09 Sympatric Speciation ( Ecological speciation = speciation within a population occurring in a single habitat. Mechanism? 1. Instantaneous speciation •. Mutation (hopeful monsters) not probable •. Polyploidy . Common in plants a) autopolyploidy self b) alloployploidy hybrid speciation
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12/9/09 Allopolyploidy con’t e.g. Marsh grasses Spartina alterniflora x Spartina maritina American British Spartina townsendii (hybrid) 2. Gradual Speciation Eg. Tephritid fly specializing on different host hawthorn trees
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12/9/09 Species Formation
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