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

  • Toshiro Yamanaka (a1) (a2), Chitoshi Mizota (a3), Yoshihiro Fujiwara (a4), Hitoshi Chiba (a5), Jun Hashimoto (a4) (a6), Toshitaka Gamo (a7) and Takamoto Okudaira (a8)...

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.

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

  • Toshiro Yamanaka (a1) (a2), Chitoshi Mizota (a3), Yoshihiro Fujiwara (a4), Hitoshi Chiba (a5), Jun Hashimoto (a4) (a6), Toshitaka Gamo (a7) and Takamoto Okudaira (a8)...

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