Evaluation of the potential role of the macroalga Laminaria japonica for alleviating coastal eutrophication |
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Authors: | Xu Dong Gao Zhengquan Zhang Xiaowen Qi Zhanhui Meng Chunxiao Zhuang Zhimeng Ye Naihao |
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Institution: | aYellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China;bSchool of Life Sciences, Shandong University of Technology, Zibo 255049, China;cSouth China Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Guangzhou 510300, China |
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Abstract: | The rapid development of human activities has caused serious eutrophication of coastal waters in China in the recent decades. The study of the biofiltration capacity of Laminaria japonica under laboratory conditions showed a significant nutrient uptake. After 36 h of incubation, around 42%, 46%, 44% of N and 45%, 42%, 35% of P were removed from three gradients of medium concentrations, respectively. In the conditions of different ratios of N/P and NO3–N/NH4–N, the optimum N/P ratio for nutrient uptake was 7.4 and L. japonica prefered NO3–N rather than NH4–N as nitrogen source. Temperature and irradiance affected uptake rates significantly. The maximal N uptake rate appeared at 10 °C and 18 μmol photons m−2 s−1 and the maximal P uptake rate was found at 15 °C and 144 μmol photons m−2 s−1. Moreover, further studies were needed to investigate the bioremediation potential of L. japonica in the open sea. |
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Keywords: | Macroalgae Laminaria japonica Nutrient uptake rate Nutrient remove efficiency Environmental factors |
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