Reversed sex change by widowed males in polygynous and protogynous fishes: female removal experiments in the field
Reversed sex change by widowed males in polygynous and protogynous fishes: female removal experiments in the field
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DOI：
10.1007/s00114-011-0860-6
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发表时间：
2011-12-01
影响因子：
--
通讯作者：
Kadota, Tatsuru
中科院分区：
文献类型：
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作者：
Kuwamura, Tetsuo;Suzuki, Shohei;Kadota, Tatsuru
性别变化，无论是先育型（雌性变雄性）还是先祖性（雄性变雌性），在鱼类中是众所周知的，但自然种群中双向性变或反向性变的证据仍然非常有限。这是第一份关于多性和先熟鱼类的雌性去除实验的报告，目的是在野外诱导丧偶雄性发生逆转的性别变化。我们从冲绳珊瑚礁上的濑鱼 Labroides dimidiatus（Labridae）和锈色神仙鱼 Centropyge ferrugata（Pomacanhidae）的雄性领地中清除了所有雌性和幼鱼。在这两个物种中，如果新的雌性或幼体没有迁移到丧偶雄性的领地，其中一些就会迁移形成雄性对雄性。当雄性-雄性配对形成时，较小的、从属的伴侣开始进行雌性性行为（L. dimidiatus 中 n = 4；C. ferrugata 中 n = 2），并最终释放卵（分别为 n = 1）。因此，丧偶男性随着社会地位的变化而发生了逆转的性别变化。这些结果表明，这种去除雌性的实验将有助于在其他多性和单性生殖物种中发现逆转的性别变化。
Sex change, either protogyny (female to male) or protandry (male to female), is well known among fishes, but evidence of bidirectional sex change or reversed sex change in natural populations is still very limited. This is the first report on female removal experiments for polygnous and protogynous fish species to induce reversed sex change in the widowed males in the field. We removed all of the females and juveniles from the territories of dominant males in the cleaner wrasse Labroides dimidiatus (Labridae) and the rusty angelfish Centropyge ferrugata (Pomacanthidae) on the coral reefs of Okinawa. In both species, if new females or juveniles did not immigrate into the territories of the widowed males, some of them emigrated to form male-male pairs. When a male-male pair formed, the smaller, subordinate partner began to perform female sexual behaviours (n = 4 in L. dimidiatus; n = 2 in C. ferrugata) and, finally, released eggs (n = 1, respectively). Thus, the reversed sex change occurred in the widowed males according to the change of their social status. These results suggest that such female removal experiments will contribute to the discovery of reversed sex change in the field also in other polygnous and protogynous species.