Japan Geoscience Union Meeting 2014

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[U-05_30PM1] Interrelation between Life, Water, Mineral, and Atmosphere

Wed. Apr 30, 2014 2:15 PM - 4:00 PM 419 (4F)

Convener:*Tsubasa Otake(Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University), Yohey Suzuki(Graduate School of Science, The University of Tokyo), Fumito Shiraishi(Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University), Ken Takai(Extremobiosphere Research Center, Japan Agency for Marine-Earth Science & Technology), Yuichiro Ueno(Department of Earth and Planetary Sciences, Tokyo Institute of Technology), Takeshi Naganuma(Graduate School of Biosphere Science), Takeshi Kakegawa(Graduate School of Science, Tohoku University), Tadashi Yokoyama(Department of Earth and Space Science, Graduate School of Science, Osaka University), Kentaro Nakamura(Precambrian Ecosystem Laboratory (PEL), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Chair:Fumito Shiraishi(Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University), Ken Takai(Extremobiosphere Research Center, Japan Agency for Marine-Earth Science & Technology)

3:00 PM - 3:15 PM

[U05-14] The effect of methane concentration on methanotrophic bathymodiolid mussels in the Okinawa Trough hydrothermal fields

*Yukari MIYAZAKI1, Michinari SUNAMURA1, Junichiro ISHIBASHI2, Hiromi WATANABE3, Uta KONNO3, Yohey SUZUKI1 (1.Graduate School of Science, the University of Tokyo, 2.Graduate School of Science, the University of Kyusyu, 3.JAMSTEC)

Keywords:hydrothermal vent, Bathymodiolus sp., Neoverruca sp., methanotroph, Okinawa Trough

As methane (CH4) is a greenhouse effect gas, the emergence and activity of CH4-oxidizing organisms is suggested to have triggered global glaciation. Although the threshold concentrations of CH4 for the growth of CH4-oxidizing microorganisms under laboratory conditions are well known, CH4-oxidizing organisms in the field is poorly constrained for the threshold concentration of CH4 for growth. This information is critical to reconstruct atmospheric and oceanic CH4 levels when the activities of methanotrophic organisms are indicated from geologic records with 12C-enriched organic matter. We investigated sediment-hosted deep-sea hydrothermal fields in the Okinawa Trough where abundantly emitted CH4 is known to support methanotrophic ecosystem represented by Bathymodiolid mussels. The distribution of Bathymodiolid mussels and the CH4 concentrations of their habitats were determined in five hydrothermal fields throughout the Okinawa Trough, and it is suggested that approximately 10μM is a threshold CH4 concentration for the methanotrophic organism in the deep-sea ecosystem.