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Eutrophication of Jiangsu Coastal Water and Its Role in the Formation of Green Tide

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Abstract

Since 2007, the large-scale green tide caused by Ulva prolifera (U. prolifera) have occurred as a recurrent phenomenon in the southern Yellow Sea of China. Field surveys and satellite remote sensing showed that the small scattered patches of green tide algae were first observed along the Porphyra agriculture area of the Subei Shoal in late April. In this study, we attempted to identify the role of eutrophication in the origin of the green tide in the Subei Shoal and its adjacent area. Subei Shoal and its adjacent area are characterized by rich nutrients, especially NO3−-N, NH4+-N, PO43−-P, and other bioavailable components (such as urea-N and amino acids). In the spring of 2017, the average concentrations of NO3−-N were 19.01 ± 11.01 µmol L−1, accounting for 86.68% of the dissolved inorganic nitrogen (DIN). In addition, the average concentration of NH4+-N was 2.51 ± 1.60 µmol L−1. PO43−−P had an average concentration of 0.14±0.13 µmol L−1. The average concentrations of urea-N and total hydrolyzed amino acids (THAA) were 1.73 ± 1.36 µmol L−1 and 1.33±0.80 µmol L−1, respectively. Rich nutritive substances play a key role in the rapid production of U. prolifera and make the Jiangsu coastal water an incubator for green tide.

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Acknowledgements

This work was supported by the Joint Fund between NSFC and Shandong Province (No. U1906210), and the China National Key Research and Development Program (No. 2016YFC1402101). And thanks are given to the cooperation fund project of China and Association of Southeast Asian Nations (ASEAN) and Ministry of Natural Resources of the People’s Republic of China.

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  1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China

    Mingyan **ao, Weina Song, **aoyong Shi & Rongguo Su

  2. National Marine Environmental Monitoring Center, Dalian, 116000, China

    Haibo Zhang

  3. National Marine Hazard Mitigation Service, Bei**g, 100194, China

    **aoyong Shi

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  1. Mingyan **ao
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**ao, M., Song, W., Zhang, H. et al. Eutrophication of Jiangsu Coastal Water and Its Role in the Formation of Green Tide. J. Ocean Univ. China 23, 109–118 (2024). https://doi.org/10.1007/s11802-024-5507-2

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