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

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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.