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Phytoplankton Dynamics and Its Further Implication for Particulate Organic Carbon in Surface Waters of a Tropical/Subtropical Estuary

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Abstract

Phytoplankton succession along with salinity in estuaries not only influences the riverine ecosystem but also interferes our understanding of riverine materials (e.g., organic carbon) transport to the sea. Four cruises were conducted in a mid-size river and its estuary (i.e., the Wanquan River) to elucidate the riverine phytoplankton decease along increasing salinity and to quantify the amount of algal particulate organic carbon (POC) present in the system at different seasons. CHEMTAX calculations suggested that chlorophytes were the main chlorophyll a (CHLa) contributor in the dissolved inorganic phosphorus-limited river, which contributed over 60 % of the total CHLa. Microscopy further revealed that the dominant species was Scenedesmus sp. In the estuary, phytoplankton succession along with salinity in the estuary was observed. Chlorophyte contribution to total CHLa dramatically decreased from over 60 % in the river (S = 0) segment to <2 % in the estuary (i.e., 0 < S < 30), whereas simultaneously, diatoms increased from <3 % to over 80 %. Microscopy revealed that Scenedesmus sp. was dramatically removed with increasing salinity, and the cell density decreased from over 540 × 103 cell/L (S = 0) to almost 0 when S > 20, suggesting the removal of riverine algae in the estuary. The mean algal POC concentration ranged from 80 μg/L (summer) to 140 μg/L (winter), and the riverine algal POC accounted for 6–56 % of the bulk riverine POC. The annual flux of riverine algal POC was estimated to be 660 tons.

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Acknowledgments

We are grateful to our colleagues and captain/crew who participated in the field work. Thanks are also given to the two anonymous reviewers whose comments improved the original manuscript. This work is funded by the Ministry of Science and Technology of China (no. 2014CB441503) and the National Science Foundation of China (nos. 41206065 and 40830850).

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Authors and Affiliations

  1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, No. 3663 Zhongshan Road North, Shanghai, 200062, People’s Republic of China

    Zhuo-Yi Zhu, Ying Wu, Ying Li, Jing Zhang & Jun Hu

  2. Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, No. 238 Songling Road, Qingdao, 266100, People’s Republic of China

    Su-Mei Liu

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  1. Zhuo-Yi Zhu
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Correspondence to Zhuo-Yi Zhu.

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Communicated by James L. Pinckney

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Zhu, ZY., Liu, SM., Wu, Y. et al. Phytoplankton Dynamics and Its Further Implication for Particulate Organic Carbon in Surface Waters of a Tropical/Subtropical Estuary. Estuaries and Coasts 38, 905–916 (2015). https://doi.org/10.1007/s12237-014-9866-6

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  • DOI: https://doi.org/10.1007/s12237-014-9866-6

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