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Sulphur-isotopic composition of the deep-sea mussel Bathymodiolus marisindicus from currently active hydrothermal vents in the Indian Ocean

Published online by Cambridge University Press:  12 August 2003

Toshiro Yamanaka ,
Chitoshi Mizota ,
Yoshihiro Fujiwara ,
Hitoshi Chiba ,
Jun Hashimoto ,
Toshitaka Gamo  and
Takamoto Okudaira
Toshiro Yamanaka
Affiliation:
Institute of Geoscience, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8571, Japan Department of Evolution of Earth Environments, Graduate School of Social and Cultural Studies, Kyushu University, Ropponmatsu, Fukuoka 810-8560, Japan
Chitoshi Mizota
Affiliation:
Faculty of Agriculture, Iwate University, Ueda 3-18-8, Morioka, Iwate 020-8550, Japan
Yoshihiro Fujiwara
Affiliation:
Marine Ecosystems Research Department, Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan
Hitoshi Chiba
Affiliation:
Institute for Study of the Earth's Interior, Okayama University, 827 Yamada, Misasa, Tohaku, Tottori 682-0193, Japan
Jun Hashimoto
Affiliation:
Marine Ecosystems Research Department, Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan Division of Marine Biology and Dynamics, Faculty of Fisheries, Nagasaki University, 1-14 Bunkyou-machi, Nagasaki, 852-8521 Japan
Toshitaka Gamo
Affiliation:
Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, N10, 8, Sapporo 060-0810, Japan
Takamoto Okudaira
Affiliation:
Department of Geosciences, Faculty of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
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Abstract

Sulphur-isotopic composition of soft tissues from Bathymodiolusmarisindicus collected from hydrothermal vents in the Indian Ocean was reported. The δ34S values of the soft tissues (+3∼+5‰ vs Cañyon Diablo troilite) were nearly identical to those from the associated hydrothermal fluid and chimney sulphides (+5 to +8‰), but were significantly different from that of the common seawater sulphate (+21‰), which suggested that the endosymbiotic bacteria used sulphide in the fluid as an energy source. Transmission electron microscopic observation of the endosymbionts also suggested that the symbiont is a thioautotroph. Bathymodiolus species, which depend on either sulphide or methane oxidation, or both, have a worldwide distribution. Bathymodiolus marisindicus from the Indian Ocean has a close relationship with congeners in the Pacific Ocean as evidenced by form of symbiosis. Biogeography and migration of the genus Bathymodiolus based on the relevant data are briefly discussed.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 83 , Issue 4 , August 2003 , pp. 841 - 848
Copyright
2003 Marine Biological Association of the United Kingdom

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