Stable isotopic characterization of carbon, nitrogen and sulfur uptake of Acharax japonica from central Japan

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概要

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• A unique community of Acharax japonica has been found in the reductive bottom sediments in two natural seawater sinks, where a number of the clams can easily be collected and successfully maintained for over a year in laboratory conditions. Stable isotopic signature of their soft body parts shows typical range for chemosynthesis-based bivalves, indicating that the clams rely on sulfur-oxidizing bacteria in their gill. δ15N values of substrate ammonia have been measured together with those of the clam soft body parts. These results confirm that the characteristic negative δ15N values of the clam soft-body parts were caused by a large isotope fractionation during ammonia assimilation as previously documented for those from various locations. In addition, sulfur isotopic ratios of each organ show significant variation. Such trend is observed for some thiotrophic chemosynthesis-based bivalves inhabited on a cold-seep environment, suggesting that it is a common feature for thiotrophic bivalve communities depended on bacterial derived sulfide. Heterogeneity of sulfur isotopic signature among different organs from one specimen was considered due to primary heterogeneity of δ34S values for source sulfide in their habitat. In addition a different turnover rate of the sulfur nutrition in each organ was conspicuous for the sulfur isotopic variation. This was confirmed by long-term maintenance using an external sulfur budget under laboratory conditions. The estimated turnover rates among three organs were the highest for gill (shorter than three months), the lowest for viscera (longer than a year), and intermediate for foot.

• 日本プランクトン学会、日本ベントス学会の論文
• 2008-02-01

著者

• Miyazaki Jun-Ichi

  Institute of Biological Sciences, University of Tsukuba

• YAMANAKA Toshiro

  Department of Physics, Faculty of Science, University of Tokyo

• MATSUYAMA SERISAWA

  Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology

• Miyazaki Jun-ichi

  Institute Of Biological Sciences The University Of Tsukuba

• Yamanaka Toshiro

  Venture Business Laboratory Kyushu University

• Tsutsumi Hiroaki

  Department Of Environmental And Symbiotic Sciences Prefectural University Of Kumamoto

• Mizota C

  Faculty Of Agriculture Kyushu University

• MIZOTA Chitoshi

  Faculty of Agriculture, Iwate University

• Mizota Chitoshi

  Faculty Of Agriculture Iwate University

• Fujiwara Yoshihiro

  Extremobiosphere Research Center Japan Agency For Marine-earth Science And Technology

• KAKEGAWA TAKESHI

  Graduate School of Science, Tohoku University

• MAMPUKU MAMI

  Department of Evolution of Earth Environments, Graduate School of Social and Cultural Studies, Kyush

• Mampuku Mami

  Department Of Evolution Of Earth Environments Graduate School Of Social And Cultural Studies Kyushu

• Miyazaki Jun-ichi

  Institute For Medical Genetics Kumamoto University Medical School

• Fujiwara Yoshihiro

  Japan Agency For Marin-earth Science And Technology

• Kakegawa Takeshi

  Graduate School Of Science Tohoku University

• Matsuyama Serisawa

  Extremobiosphere Research Center Japan Agency For Marine-earth Science And Technology

• Yamanaka Toshiro

  Department Of Earth And Planetary Sciences Faculty Of Science Kyushu University

• Mizota Chitoshi

  Faculty Of Agricultuer Iwate University

• Matsuyama-Serisawa Kazuyo

  Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology

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