Origin and evolution of freshwater amphidromy: Suggestion of a new migration type

在对Sicyopterus japonicus （Sicyopterus japonicus， sicyopterae亚科中唯一的温带物种）的生态研究中，我们发现了黑潮对幼虫分散的影响，以及幼虫对海洋生长的基本依赖，以及缺乏内陆或河流形式。它们的幼虫在海洋中的分散和在河流中的生活史特征对该物种的温带分布起了作用。热带地区的Sicydiine幼虫阶段可能要求所有物种都在海洋中发生，但温带地区的ayu， sculpins和星系都有内陆或河流形式，其幼虫不需要进入海洋进行幼虫喂养和生长。这表明Sicydiine幼虫对海洋的依赖性较高，而ayu， sculpins和galid幼虫对海洋的依赖性较低。热带和温带地区的淡水两栖鱼类在其生活史的进化过程中似乎发展了两种不同的策略。

During ecological research of Sicyopterus japonicus, which is the only temperate species of the subfamily Sicydiinae, we found larval dispersion by Kuroshio Current, an essential larval dependence on growth in the ocean, and a lack of landlocked or fluvial forms. Their larval dispersion in the ocean and life history characteristics in the river has played a role in the temperate distribution of this species. The Sicydiine larval stage in tropical areas may be required to occur in the ocean for all species, but ayu, sculpins and galaxiids in temperate areas have landlocked or fluvial forms with larvae that do not need to enter the ocean for larval feeding and growth. This suggests that Sicydiine larvae have a high oceanic dependency, whereas ayu, sculpins and galaxiid larvae have a low oceanic dependency. Freshwater amphidromous fish in tropical and temperate areas appear to have developed two different strategies in the evolution of their life histories.