Sex change (sequential hermaphroditism) has evolved repeatedly in teleost fishes when demographic conditions mediate fundamentally different sex-specific returns for individuals of particular age and size. We investigated the conditions for potential sex change in an annual killifish (Millerichthys robustus) from temporary pools in Mexico. In natural populations, we detected adults with intersex colouration and gonads. Therefore, we experimentally tested whether this apparent sex change can be generated by manipulation of ecological and social conditions, rather than being caused by environmental disturbance. We demonstrated functional protogynous (female-to-male) sex change in 60% replicates, when groups of five females interacted and had a visual and olfactory cue of a male. Only one female changed sex in any given replicate. The sex change never occurred in isolated females. Protandrous (male-to-female) hermaphroditism was not recorded. We characterized gradual changes in behaviour, colouration and gonad structure during the sex change process. The first behavioural signs of sex change were observed after 23 days. Secondary males spawned successfully after 75 days. We discuss the adaptive potential of sex change in short-lived annual fishes through the seasonal decline of males, and during colonization of new habitats. This is the first observation of functional hermaphroditism in an annual killifish.

Asociación Mexicana para el Estudio y Conservación de Cyprinodontiformes Tlalpan C P 14390 CDMX Mexico

Department of Botany and Zoology Faculty of Science Masaryk University Brno Czech Republic

Department of Ecology and Vertebrate Zoology Faculty of Biology and Environmental Protection University of Łódź Łódź Poland

Ichtyologie Muséum national d'Histoire naturelle 53 rue Cuvier 75005 Paris France

Institute of Vertebrate Biology Czech Academy of Sciences Brno Czech Republic

Licenciatura en Biología Universidad Autónoma Metropolitana Unidad Xochimilco Calzada de Hueso 1100 Coyoacán CDMX Mexico

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