干潟に堆積する有機物の起源およびバクテリアによる利用性  [in Japanese] Origin and Bacterial Utilization of Organic Matters in Tidal-Flat Sediment  [in Japanese]

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Abstract

本研究では干潟に堆積する有機物のバクテリアによる利用性について、安定同位体比および脂肪酸組成を用いて有機物の起源別に解析した。堆積有機物および食物源候補である陸上植物、海洋粒状有機物、河川粒状有機物および底生微小藻類は、蒲生干潟および七北田川河口より採取した。安定同位対比により陸上植物(δ<sup>13</sup>C = -26.6、δ<sup>15</sup>N = 3.6)および河川粒状有機物(δ<sup>13</sup>C = -25.5、δ<sup>15</sup>N = 8.9)は、底生微小藻類(δ<sup>13</sup>C = -16.3、δ<sup>15</sup>N = 6.2)および海洋粒状有機物(δ<sup>13</sup>C = -20.3、δ<sup>15</sup>N = 10.3)と明確に区別できた。50日間の堆積有機物の分解実験において、堆積有機物のδ<sup>13</sup>C値は-19.1 ‰から-20.7 ‰に減少した。この理由はバクテリアがより高いδ<sup>13</sup>Cを有する有機物、すなわち底生微小藻類および海洋粒状有機物を優先的に利用するためと考えられた。また脂肪酸をバイオマーカとした解析から陸上植物および河川粒状有機物は、底生微小藻類および海洋粒状有機物の分解が進行した後に分解し始めることが明らかとなった。

The origin and bacterial utilization of organic matters in tidal-flat sediment were investigated using stable isotope and fatty acid analysis. Sedimentary organic matter (SOM) and potential food sources such as land plant, marine particulate organic matter (POM), benthic microalgae, riverine POM were taken from Gamo lagoon and Nanakita River Mouth. Land plant (δ<sup>13</sup>C = -26.6 and δ<sup>15</sup>N = 3.6) and riverine POM (δ<sup>13</sup>C = -25.5 and δ<sup>15</sup>N = 8.9) were isotopically distinct from benthic microalgae (δ<sup>13</sup>C = -16.3 and δ<sup>15</sup>N = 6.2) and marine POM (δ<sup>13</sup>C = -20.3 and δ<sup>15</sup>N = 10.3). In the degradation experiment of SOM for 50 days, the δ<sup>13</sup>C value of SOM decreased from -19.1 ‰ to -20.7 ‰. This was due to the preferential utilization of higher δ<sup>13</sup>C organic matter such as benthic microalgae and marine POM by bacteria. Land plant and riverine POM had begun to degrade after the degradation of benthic microalgae and marine POM progressed.

Journal

  • Japanese Journal of Water Treatment Biology

    Japanese Journal of Water Treatment Biology 48(2), 29-35, 2012-06-15

    Japanese Society of Water Treatment Biology

References:  22

Codes

  • NII Article ID (NAID)
    10030808944
  • NII NACSIS-CAT ID (NCID)
    AN00351126
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09106758
  • NDL Article ID
    023846163
  • NDL Call No.
    Z14-557
  • Data Source
    CJP  NDL  J-STAGE 
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