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      Nutrient Enrichment Regulates the Growth and Physiological Responses of Saccharina japonica to Ocean Acidification

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          Abstract

          Environmental changes, such as ocean acidification and eutrophication, have created threats to kelp mariculture. In this study, the growth, photosynthesis, respiration and nutrient composition of Saccharina japonica were evaluated at different levels of pCO 2 (400 and 800 µL L –1) and nutrients (nutrient-enriched and non-enriched seawater). Elevated pCO 2 decreased the relative growth rate (RGR), net photosynthetic rate and contents of tissue carbon and tissue nitrogen under non-enriched nutrient conditions, but it had no significant effect on these parameters under nutrient-enriched conditions. The dark respiration rate was positively affected by elevated pCO 2 regardless of the nutrient conditions. However, the C:N was unaffected by elevated pCO 2 at both nutrient levels. These results implied that ocean acidification could reduce the production and nutrient contents in the tissues of S. japonica, which was associated with nutrient conditions.

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          Author and article information

          Journal
          JOUC
          Journal of Ocean University of China
          Science Press and Springer (China )
          1672-5182
          10 July 2020
          01 August 2020
          : 19
          : 4
          : 895-901
          Affiliations
          1The Key Laboroatory of Mariculture (Ocean University of China), Ministry of Education, Qingdao 266003, China
          Author notes
          *Corresponding authors: LIU Yan, E-mail: qd_liuyan@ 123456ouc.edu.cn ; GONG Qingli, E-mail: qingli@ 123456vip.sina.com
          Article
          s11802-020-4359-7
          10.1007/s11802-020-4359-7
          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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          Self URI (journal-page): https://www.springer.com/journal/11802

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