Mate choice in annual killifishes

The annual killifishes Austrolebias charrua and A. reicherti live in ephemeral pools in the grasslands of Uruguay. The entire life cycle is completed in the winter months, when these pools contain water. The rest of the year, eggs remain in diapause in the dry substrate. Unique life-history, discrete generations, and small, isolated habitats make these species ideally suited for studying the interaction of mate choice with variables like sex ratio, water quality, and community structure. We are beginning work on this system in collaboration with Carlos Passos and Bettina Tassino at the Universidad de la República in Montevideo.