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Sex change of primary males in a diandric labrid Halichoeres trimaculatus: coexistence of protandry and protogyny within a species

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In the threespot wrasse Halichoeres trimaculatus, sex change of primary males was observed in the field and confirmed by aquarium experiments. In other words, protandry and protogyny coexisted within this species. Moreover, male-to-female-to-male sex change and female-to-male-to-female sex change were observed in aquarium experiments; i.e. reversed sex change occurred in both protandrous and protogynous hermaphrodites. These results suggest that only the direction of sex differentiation before maturation may differ between the two sexual types that have been regarded as a primary male and a protogynous hermaphrodite.

Keywords: Labridae; bi-directional sex change; primary male; protandry; protogyny

Document Type: Regular Paper


Affiliations: 1: Okinawa Churaumi Aquarium, Ishikawa, Motobu-cho, Okinawa 905-0206, Japan 2: Department of Biology, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan 3: College of Economics, Nihon University, Misaki-cho, Chiyoda-ku, Tokyo 101-8360, Japan

Publication date: June 1, 2007


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