An experimental test of parasite adaptation to common vs. rare host genotypes

Amanda Gibson, P. Signe White, McKenna Penley, Jacobus De Roode & Levi Morran
A core hypothesis in coevolutionary theory proposes that parasites adapt to specifically infect common host genotypes. Under this hypothesis, parasites function as agents of negative frequency-dependent selection, favoring rare host genotypes. This parasite-mediated advantage of rarity is key to the idea that parasites maintain genetic variation and select for outcrossing in host populations. Here, we report the results of an experimental test of parasite adaptation to common vs. rare host genotypes. We selected the bacterial...
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