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      The Effect of Bioturbation Activity of the Ark Clam Scapharca subcrenata on the Fluxes of Nutrient Exchange at the Sediment–Water Interface

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          Filter-feeding shellfish are common benthos and significantly affect the biogeochemical cycle in the shallow coastal ecosystems. Ark clam Scapharca subcrenata is one of the widely cultured bivalve species in many coastal areas owing to its tremendous economic value. However, there is little information regarding the effects of the bioturbation of S. subcrenata on the fluxes of nutrient exchange in the sediment-water interface (SWI). In this regard, S. subcrenata was sampled during October 2016 to determine the effects of its bioturbation activity on the nutrient exchange flux of the SWI. The results showed that the biological activity of S. subcrenata could increase the diffusion depth and the rate of the nutrients exchange in the sediments. The bioturbation of S. subcrenata could allow the nutrients to permeate into the surface sediments at 6–10 cm and increase the release rate of nutrients at the SWI. The releasing fluxes of DIN and PO 4 3−-P in the culture area were found to be around three times higher than that in the non-cultured region. The culture of S. subcrenata has been proved to be an important contributor to nutrient exchange across the SWI in the farming area of Haizhou Bay. Nutrients exchange in the SWI contributes a part of 86% DIN, 71% PO 4 3−-P and 18% SiO 3 2−-Si for the aquaculture farm.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          20 December 2019
          01 February 2020
          : 19
          : 1
          : 232-240
          1College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
          2Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
          3National Demonstration Center for Experimental Fisheries Science Education (Shanghai Ocean University), Shanghai 201306, China
          4National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China
          5College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
          6Maine Fisheries Research Institution of Jiangsu, Nantong 226000, China
          7Lianyungang City Oceanic and Fishery Administration, Lianyungang 222002, China
          8Institute of Industrial Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Japan
          Author notes
          *Corresponding author: ZHANG Junbo, E-mail: jb_zhang@
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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