Biology 1201A Lecture Notes - Microevolution, Cichlid, Sympatry
24 Dec 2011
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Document Summary
Macroevolution - speciation: morphological species concept, biological species concept, reproductive isolation (read 18. 7, mechanisms promoting speciation, reinforcement of accumulated differences. Macroevolution the origin of higher order taxonomic groups (i. e. species and beyond) Brings together concepts of: descent with modification common ancestry speciation. Macroevolution results from the accumulation of microevolutionary changes over time. Morphological species concept: identified by morphological similarity, consistent with linnean classification, occupy distinct clusters in phenotypic space, widely applicable species 2. 4 wings, 6 legs species 1 s g e l. Biological species concept groups of potentially or actually interbreeding organisms, reproductively isolated from other groups: easy to apply. Mechanisms promoting speciation: allopatric speciation barrier subdivides a population allowing for the accumulation of differences, long-distance dispersal before during after e. g. hawaiian drosophilids. Mechanisms promoting speciation: vicariance formation of a geographic barrier, splitting a population in two before during after e. g. grand canyon.
