ESPM 108B Lecture 12: 12 Migration

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Migration/gene ow: the movement of genes from one pop to another. Homogenizes pops, counteracts diversity loss thru drift. Movement of genes must be of evol importance - migrants contribute alleles to the sink population. Possibility of local adaptation and of adaptive evol in complex landscapes. Migration-drift balance : persistence of local pops. The evolution of species ranges - colonization, mass movement, founders. Synchrony of pop size changes - central-peripheral pop demog. Allele sur ng : rapid allele freq changes during colonization. Marking and following indiv orgs is time consuming and expensive, but mark and recapture is prone to bias. Long-dist dispersal may be very hard to observe but v important biologically. Est. of migration are limited in time and don"t accurately re ect rare but important events. Direct measures of disp don"t necessarily re ect the movement of genes bc the migrant must reproduce effectively in the new location for gene ow to have occurred.

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