*Yasuhiko OHARA¹, Ken TAKAI², Hiromi WATANABE², Uta KONNO², Teruaki ISHII³, Sherman BLOOMER⁴, Genki OZAWA⁵, Yuji ONISHI⁶, Masakazu FUJII⁷ (1.Hydrographic and Oceanographic Department of Japan, 2.Japan Agency for Marine-Earth Science and Technology, 3.Fukada Geological Institute, 4.Oregon State University, 5.Kitasato University, 6.Okayama University, 7.Atmosphere and Ocean Research Institute, University of Tokyo)

*Genki OZAWA¹, Takashi KANEKO², Shigeru SHIMAMURA³, Yoshihiro TAKAKI³, Takeshi KOSHIISHI³, Chiaki KATO³, Tadashi MARUYAMA³, Takao YOSHIDA³ (1.Department of Marine Biosciences, School of Marine Biosciences, Kitasato university, 2.Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 3.Tokyo College of Biotechnology)