Relationship between the microbial community and nutrient elution during the formation of hypoxic water mass in Nakaumi

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  • HASHIDA Kazuki
    Department of Advanced Production and Constructions Systems Course, National Institute of Technology, Matsue College
  • KATO Toshikuni
    Shimane Prefectual Institute of Public Health and Environment Science
  • TAKEBE Masamichi
    Department of Civil and Environmental Engineering, National Institute of Technology, Matsue College
  • YAMAGUCHI Tsuyoshi
    Department of Civil and Environmental Engineering, National Institute of Technology, Matsue College

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  • 中海における貧酸素水塊による栄養塩溶出と微生物群集構造の関係

Abstract

<p>　In this study, the structure of microbial communities during a hypoxic water formation period in Nakaumi was revealed using molecular biological techniques. Nakaumi is a meromictic lake in which seawater from the Sea of Japan and fresh and low-salinity water from Shinji Lake flow in. As a result, microorganisms related to the sulfur cycle were dominant across the sampling points of Nakaumi under oxygen-deficient conditions. It was suggested that hydrogen sulfide was produced during the hypoxic water formation period by sulfate-reducing bacteria, which are dominant in Nakaumi. In addition, sulfate-reducing bacteria were also detected in the bottom water, which indicates that the microbial sulfur cycle is present not only in the sludge but also in the bottom water. The abundance ratios of Nitrosopumilus martimus, an ammonia-oxidizing archaeon, and genus Nitrospira, nitrite-oxidizing bacteria were higher in October than in September because of the inflow of oxygen from the water of Sea of Japan. However, the abundance ratio of the genus Nitrospira was very low in Nakaumi. Thus, the accumulation of nitrite in Nakaumi is inferred from the low abundance ratio of the genus Nitrospira in Nakaumi.</p>

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