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Fig. 4 | BMC Evolutionary Biology

Fig. 4

From: Population genetic processes affecting the mode of selective sweeps and effective population size in influenza virus H3N2

Fig. 4

Model of complex demography (metapopulation dynamics) under which recurrent positive selection occurs. a. Population is subdivided into six demes in the northern hemisphere (green) and two demes in the southern hemisphere (blue). Viruses migrate between demes in all directions (red arrows). b. Seasonal changes in the carrying capacities (K) of demes. c. Synonymous diversity (πs) and soft sweep rate (f soft) according to population size (N) in metapopulation models. C1: rates of migrations in all directions are equal. C2: immigration and emigration rate of a single northern deme is 10 times larger than the other demes. One of the six northern demes does not undergo the extinction-recolonization cycle but maintains K = 0.2K max (C3a) or 500 (C3b)

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