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EVOLUTION OF BOTH-WAYS SEX CHANGE AND SOCIAL SYSTEMS AMONG FISHES

鱼类双向性别变化和社会系统的进化

基本信息

批准号：
05640718
负责人：
KUWAMURA Tetsuo
金额：
$ 1.34万
依托单位：
CHUKYO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640718/
关键词：
Both-ways sex change Hermaphroditism Sex allocation Reproductive strategy Social system Fish

项目摘要

The further analysis of our data on both-ways sex change in the monogamous gobies, Paragobiodon and Gobiodon, suggested that the change of social status as the result of movement between groups was the main factor for the evolution of their both-ways sex change.This is the newly found condition in addition to the other two conditions for the evolution of both-ways sex change known in some plants and marine invertebrates.The inter-group movement may occur also in some other protandrous or protogynous fishes, in which sex change is socially controlled, and the possibility of sex change in the reverse direction is suggested in such species.To confirm whether they could change sex in the reverse direction, I carried out the field obervations and the aquarium experiments of keeping two fish of the same sex.In three protandrous and monogamous species of the anemonefishes, Amphiprion clarkii, A.frenatus and A.perideraion, the females were aggressive each other and never changed sex to male to form a new pair.Out of three protogynous and polygynous species, the males never changed sex to female in the wrasse Halichoeres melanurus, but in the damselfish Dascyllus aruanus and the wrasse Labroides dimidiatus the males changed the shape of their urogenital papillae to that of females although their breeding as females has not yet been observed.From these results in addition to the fact that female to male sex change is prevailing in all the fishes that are known to have abilities to change sex in both ways, it is suggested that the factors for evolution of protandry may inhibit the occurrence of sex change in the reverse direction.This prediction will be further investigated.

对一夫一妻制的对虾虎鱼和戈壁虎鱼双向性别变化数据的进一步分析表明，由于群体间的移动而导致的社会地位的变化是它们双向性别变化进化的主要因素。这是在一些植物和海洋无脊椎动物中已知的另外两种双向性别变化进化的新发现的条件。在一些其他原生或原雌鱼中也可能发生类群间的性别变化，其中性别变化是受社会控制的，并在这些物种中提出了反向性别变化的可能性。在野外观察和水族箱实验中，饲养了两条相同性别的鱼。在三种原性和单性配对的海葵中，雌性相互攻击，从未变性为雄性以形成新的配对。在三种原性和一夫多妻性的物种中，雄性从未变性为雌性。但在柔鱼Dascyllus aruanus和Wasse Labroidesdimidiatus中，雄性将其泌尿生殖器乳头的形状改变为雌性，尽管它们的雌性繁殖尚未被观察到。从这些结果来看，除了已知的所有具有双向变性能力的鱼类都存在雌性向雄性转变的事实外，这一预测将被进一步研究。