Experimental Studies of Wright’s Shifting Balance Theory
Experimental Studies of Wright’s Shifting Balance Theory
This chapter contains a discussion of the ecological and the genetic basis for Sewall Wright’s Shifting Balance Theory. It also relays discussions of the author with Wright about how to experimentally test his theory using flour beetle metapopulations. The experimental design used by Wade and C. J. Goodnight to test Wright’s theory and to estimate realized group heritabilities is illustrated. The surprizing finding that interdemic selection every-other generation produced a larger response than selection at every generation was interpreted as evidence of non-additive effects on population mean fitness.
Keywords: Fisherian individual selection, interdemic selection, periodic versus continuous interdemic selection, realized group heritability, Sewall Wright, Shifting Balance Theory, social learning models, the adaptive landscape, variation in migration and Fst
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