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

DOI Web Site 被引用文献5件 参考文献24件
  • Yamanaka Toshiro
    Department of Evolution of Earth Environments, Graduate School of Social and Cultural Studies, Kyushu University
  • Mizota Chitoshi
    Faculty of Agriculture, Iwate University
  • Matsuyama-Serisawa Kazuyo
    Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology
  • Kakegawa Takeshi
    Graduate School of Science, Tohoku University
  • Miyazaki Jun-Ichi
    Institute of Biological Sciences, The University of Tsukuba
  • Mampuku Mami
    Department of Evolution of Earth Environments, Graduate School of Social and Cultural Studies, Kyushu University
  • Tsutsumi Hiroaki
    Department of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto
  • Fujiwara Yoshihiro
    Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology

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  • Stable isotopic characterization of carbon, nitrogen and sulfur uptake of <i>Acharax japonica</i> from central Japan

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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.

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