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, 81 (19), 6078-9

Search, Encounter Rates, and the Evolution of Anisogamy

Search, Encounter Rates, and the Evolution of Anisogamy

P A Cox et al. Proc Natl Acad Sci U S A.

Abstract

We describe analytical and numerical models to study gamete encounters in two and three dimensions between differently sized gametes without assuming pre-existing mating types. Our results indicate that an isogamous population can be successfully invaded by a gametangium if it produces gametes of a different size. The existence of a low adaptive peak for isogamy and a much higher adaptive peak for anisogamy suggests that stochastic forces may be initially important in driving isogamy through the fitness saddle to anisogamy.

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