Study on origin of marine shallow water organisms in warm temperate and tropical regions - case study on crustacean anoumeans

为了揭示温暖和热带海洋动物群的起源，我们研究了遗传分歧浅水寄居蟹作为模式生物。 长爪寄居蟹广泛分布于日本的亲潮区至黑潮区。 在Oyashio地区的人口冬季生殖期持续时间短，男性是非常积极的其他男性。 但黑潮区种群的繁殖季节为夏季，雄-雄竞争较弱。 通过mtDNA COI基因的分析，在遗传结构上没有显著差异，因此这些差异可能归因于不同水温引起的表型差异。 绿僵菌是印度-西太平洋热带种，但其分布范围向北延伸至关东地区。 我们检测了COXI基因，发现东南亚的一些群体与温带日本的群体具有不同的遗传结构。 这表明温带地区和热带地区之间存在一定的遗传分化。

To reveal origins of warm and tropical marine fauna, we examined genetic divergence using shallow water hermit crabs as model organisms. Pagurus filholi is widely distributed from Oyashio Current area to Kuroshio Current area. Population in Oyashio area has winter reproductive period with short duration, and males are very aggressive for other males. But, population in Kuroshio area has summer reproductive season and male-male competition is mild. By mtDNA COI gene, no significant difference in genetic structure, so that these difference may be attributable to phenotipic originated from different water temperature. Clibanarius virescens is tropical Indo-west Pacific species but is extended its distribution toward the north to Kanto District. We examined COXI gene and found that some populations in Southeast Asia have different genetic structure from those in temperate Japan. This suggests that some genetic divergency occurs between temperate area and tropical area.