[M-IS28] Fluid-sediment migration and geo-bio interaction

[MIS28-P02] New distribution and implication of dispersal capabililty of a deep-sea chemosymbiotic squat lobster Shinkaia crosnieri

*Hiromi Kayama WATANABE¹, Chong Chen¹, Tin-Yam Chan², Chien-Hui Yang², Chu-Chang Wang³, Satoshi Mitarai⁴, Hiroyuki Yamamoto¹ (1.Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2.National Taiwan Ocean University, 3.Taiwan Ocean Research Institute (TORI), 4.Okinawa Institute of Science and Technology (OIST))

Keywords:Chemosynthesis-based ecosystem, symbiotic bacteria

Distribution range and dispersal capability are important for conservation and understanding changing ocean. A galatheid squat lobster, Shinkaia crosnieri, is the dominant animas harboring epibiotic symbionts, in methane-rich deep-sea chemosynthetic environments both of hydrothermal vent and methane seep in the northwestern Pacific. Here we report that a juvenile of S. crosnieri inhabits in methane-poor hydrothermal vent field in the northwestern Pacific, with juveniles of another squat lobster species Munidopsis myojinensis, which does not have symbiontic microbes. Genetic analysis inferred that the juvenile seemed to migrate from the population in methane seep sites in South China Sea, rather than those in hydrothermal vent fields in Okinawa Trough, East China Sea. The present observation indicates that the range of dispersal of S. crosnieri extend north to the Myojin Knoll, while the dispersal capability is not simply correlate to horizontal distance. Furthermore, the present findings may suggest that the settlement of the vent/seep specific animal with symbionts are controlled by phylogenetic constraints rather than environmental specific factors.