The effect of local stock density on social behavior and sex change in the Mediterranean labrid Coris julis
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- Lejeune, P. Environ Biol Fish (1987) 18: 135. doi:10.1007/BF00002601
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Two stocks of Coris julis, a protogynous hermaphrodite labrid fish, were studied in the field in Corsica (France) to observe the effect of stock density variations on the timing of sex change. A higher density was associated with lower terminal phase male's territory size and an earlier sex change whilst the proportion of terminal phase males in the stock increased. As well, the average number of females courted per terminal phase male and the percentage of spawning with non-territorial male interferences remained similar in the two situations. These results indicate that territory availability should be considered as an important cue for wrasse sex change.