Why Be a Both-ways Sex Changer?
Article first published online: 26 APR 2010
1995 Blackwell Verlag GmbH
Volume 101, Issue 4, pages 301–307, January-December 1995
How to Cite
Nakashima, Y., Kuwamura, T. and Yogo, Y. (1995), Why Be a Both-ways Sex Changer?. Ethology, 101: 301–307. doi: 10.1111/j.1439-0310.1995.tb00367.x
- Issue published online: 26 APR 2010
- Article first published online: 26 APR 2010
- Received: June 30, 1994; Accepted: May 18, 1995
Sex change is a rather common phenomenon among aquatic animals, but only a few have been reported to change sex in both directions. In laboratory experiments we demonstrated that the coral goby, Paragobiodon echinocephalus, changed sex in both directions with the same likelihood. When the goby lost its mate in the field, it preferred changing sex in either direction over moving a long distance in search of a heterosexual mate. Change in social rank, which is likely to occur in many other hermaphroditic fish, corresponded exactly with the direction of sex change. This constitutes a new condition for the evolution of both-ways sex change among plants and animals.