Studies on phylogeny of hermaphroditism and social sturucture in fish

本研究对三种虾虎鱼属Trimma、Priolepis和Trimmatom的交配系统和系统发育关系进行了研究。在水族箱中观察交配系统。Trimma tevegae、T. taylori和T. marinae分别为一夫多妻、随机交配和雄性领地访问一夫多妻伴潜行。性T。tevegae，T. taylori和T.海洋性鱼类分别为雌雄先熟型、雌雄先熟型和生殖散布型，与大小优势模型的预测结果相一致。4种锯鳞鱼为单头或成对捕获，表明其为一夫一妻制交配。线粒体DNA系统发育分析表明，短鳞鲀属近形，短鳞鲀属和锯鳞鲀属近形。由于Trimmatom是生殖器，结果表明发生了从生殖器到两性生殖器再到生殖器的进化。

In this study, mating system and phylogenetic rekationship among the gobiid genus Trimma, Priolepis and Trimmatom were investigated. Mating system was observed in aquarium. Those of Trimma tevegae, T. taylori and T. marinae were polygyny, randam mating and male-territory-visiting polygyny with sneaking, respectively. Sexuality of T. tevegae, T. taylori and T. marinae were protogyny, protandry and gonochore, respectively, corresponding to prediction by size-advantage model. Four species of Priolepis were captured as single or pairs, suggesting monogamous mating system. Phylogenetic analysis by mtDNA showed that Trimmatom was plesiomorphic, and Trimma and Priolepis were apomorphic. As Trimmatom is gonochore, the results indicate that evolution for gonochore to hermaphrodite to gonochore took place.