西太平洋の化学合成生物群集における分散と進化 : 熱水噴出域における進化学的研究の対象生物としてのハナカゴ類

概要

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Molecular phylogenetic analyses are powerful techniques for the study of the dispersal and evolutionary processes of animals endemic to chemoautosynthesis-based communities. In the Western Pacific, these techniques have been used with some species and dispersal processes have been hypothesized to explain the different distribution patterns that have been recognized between vent-endemic animals and those inhabiting both vent and seep areas. To understand the dispersal processes of both groups, information on the ecological characteristics of their planktonic larval life history is necessary, but there are few data about the developments and growth of vent and/or seep animals in the Western Pacific. The vent-endemic barnacles, Neoverruca spp., are widely distributed and abundant in the hydrothermal vent fields of the Western Pacific. Preliminary results of molecular phylogenetic analysis based on partial mitochondrial COI sequences indicate that there are genetic differences among four regional populations, namely the Manus Basin, the Mariana Trough, the Okinawa Trough, and the Izu-Ogasawara Ridge. In the laboratory, the adults and larvae can be reared under 1 atm. The larvae have a long planktonic period (about 70 days) even though they are lecithotrophs. Neoverruca barnacles are useful for studies on dispersal and evolution in chemoautosynthesis-based communities.
日本ベントス学会の論文
2003-06-27