Journal of the Marine Biological Association of the UK

Research Article

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

Toshiro  Yamanaka a1c1p1, Chitoshi  Mizota a2, Yoshihiro  Fujiwara a3, Hitoshi  Chiba a4, Jun  Hashimoto a3p2, Toshitaka  Gamo a5 and Takamoto  Okudaira a6
a1 Institute of Geoscience, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8571, Japan
a2 Faculty of Agriculture, Iwate University, Ueda 3-18-8, Morioka, Iwate 020-8550, Japan
a3 Marine Ecosystems Research Department, Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan
a4 Institute for Study of the Earth's Interior, Okayama University, 827 Yamada, Misasa, Tohaku, Tottori 682-0193, Japan
a5 Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, N10, 8, Sapporo 060-0810, Japan
a6 Department of Geosciences, Faculty of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan

Article author query
yamanaka t   [PubMed][Google Scholar] 
mizota c   [PubMed][Google Scholar] 
fujiwara y   [PubMed][Google Scholar] 
chiba h   [PubMed][Google Scholar] 
hashimoto j   [PubMed][Google Scholar] 
gamo t   [PubMed][Google Scholar] 
okudaira t   [PubMed][Google Scholar] 


Sulphur-isotopic composition of soft tissues from Bathymodiolus marisindicus collected from hydrothermal vents in the Indian Ocean was reported. The δ34S values of the soft tissues (+3[similar]+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.

(Received March 11 2002)
(Accepted April 28 2003)

c1 e-mail:
p1 Department of Evolution of Earth Environments, Graduate School of Social and Cultural Studies, Kyushu University, Ropponmatsu, Fukuoka 810-8560, Japan
p2 Division of Marine Biology and Dynamics, Faculty of Fisheries, Nagasaki University, 1-14 Bunkyou-machi, Nagasaki, 852-8521 Japan