BS 148H Lecture 5 - • reproduction to early to match food...

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BS 148H Lecture 5 16:10 Speciation and Species Concepts  (txt ch. 24) Speciation is the fundamental mechanism that drives biodiversity to evolve  (about creating new kinds of beings that are evolved from ancestors) No clear cut definition on what is a species Genetic and phenotypic divergence and local adaptation require reduced  gene flow  Genetic (reproductive) isolation and divergence is the cause of speciation Gene flow and adaptation Gene flow can disrupt local adaptation resulting in a kind of average  adaptation that is not perfectly specialized to any of the local environments Study: Local specialization and maladaptation in the Mediterranean blue tit  Birds reproduction timed to match food in dominant deciduous forest  o birds hatch at the same time the caterpillars are most abundant 
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Unformatted text preview: • reproduction to early to match food in rare evergreen forest o gene flow disrupts evolutionary adaptations for birds in the rare evergreen forest so the birds are unable to diverge from reproductive timing of the deciduous forest which prevents speciation *Assortive mating could easily lead to speciation in sympatry The Endangered Species Act of 1973 • protects any subspecies and any distinct population segment but offers no definition for either of these categories o how different do they have to be to constitute a new subspecies or distinct population segment? • This creates the problem that virtually anything can be listed on the federal list of endangered species 16:10 16:10...
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This note was uploaded on 11/11/2010 for the course BS 158H taught by Professor Elzinga during the Fall '08 term at Michigan State University.

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BS 148H Lecture 5 - • reproduction to early to match food...

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