Mechanismens of sexual selection in the common guppy
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Previous research has shown partial prezygotic isolation between two lineages of Poecilia reticulata: the common guppy and the endlers livebearer. Female mate choice is thought to drive this isolation. This isolation has resulted in morphological and behavioral divergence, and may signal incipient speciation. The endler morphotype is marked by distinct coloration patterns and an elongated body (1). Our experiments investigated the roles of visual and behavioral signals in determining female preference for their ancestral lineage. Female preference for males of her ancestral lineage could allow females to select for genes well suited for the environment, or be a result of run-away sexual selection since females do inherit trait preferences (2) and no genetic incompatibility between the populations has been observed.