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Evolutionary response (a,b) and heritability (c,d) in a migratory population selected for residency under six different fitness functions, assuming 10 (a,c) or 200 loci (b,d). Different fitness functions are distinguished by colour (figure 1). Filled points give discrete fitness functions, open points semi-continuous functions. Each point represents the mean of 20 simulations. (Online version in colour.)
