A cryptic rock-paper-scissors game between Drosophila males.

Abstract excerpt

Explaining the maintenance of genetic variation in characters associated with Darwinian fitness is a preoccupation of evolutionary biologists. Spatial or temporal variation in the environment can certainly promote polymorphism, yet even populations of 'model organisms', like fruit flies, kept on invariant protocols for hundreds of generations in the laboratory often show fitness variation that exceeds what would...

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