Sexual Response of Female Great Tits to Variation in Size of Males' Song Repertoires

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Abstract
We investigated the effects of the size of the males'' song repertoire on the sexual display behavior of female great tits, in an attempt to determine the relative "attractiveness" of different sizes of repertoire. Previous work had discovered a correlation between the repertoire size of males and their lifetime reproductive success. In our experiment, females were brought into reproductive behavior by photoperiod and hormone manipulations and the tested in the laboratory. Tests involved repertoire size ranging from one to five song types, spanning most of the variation found in natural populations of singing males. The number of copulation-solicitation displays given by the females increased with repertoire size. Our results are consisted with the "truth in advertising" model of sexual selection for the evolution of large repertoire size in songbirds. Females obtained a direct reproductive advantage from mating with males with large repertoires.