Departmental Bulletin Paper シマギンポにおける雌の配偶者選択と雄の性的形質発現に与える雄性ホルモンの影響

井手, 勇旗  ,  松本, 有記雄  ,  竹垣, 毅

97pp.19 - 24 , 2016-03 , 長崎大学水産学部
Effects of male courtship behavior and male sexual traits on female mate choice in a combtooth blenny Salarias luctuosus were investigated in the intertidal zone at Mie coast, Nagasaki, Japan. Females entered into the nests occupied by males with vigorous courtship displays, but they sometimes came out of the nests without spawning. The females that had entered the nests spawned there when larger males occupied the nests. As known in many animals, larger males might have a higher quality of parental care of eggs. On the other hand, the male head crest size and orange spot size did not have any influence on the female mate choice. In addition, the female preference for the males tending eggs in the nests was not confirmed in this study. In this study, factors influencing expressions of male courtship behavior and sexual dimorphism were also investigated. The time spent for male courtship behavior was not affected by available spawning space in the nests or male body condition, but was positively correlated with plasma levels of 11-ketotestosterone (11-KT). Moreover, a positive correlation between 11-KT levels and male head crest size was suggested, but there was no significant correlation between 11-KT levels and orange spot size.

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