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Article

Dissipation of a Polykrikos geminatum Bloom after Wind Events in Pearl River Estuary

1
CAS Key Laboratory of Tropical Marine Bio-Resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
4
Department of Marine Sciences, University of Connecticut, Groton, CT 06340, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Anas Ghadouani
Water 2022, 14(15), 2313; https://doi.org/10.3390/w14152313
Received: 22 March 2022 / Revised: 21 June 2022 / Accepted: 22 July 2022 / Published: 25 July 2022
Dinoflagellates is one dominant group in coastal marine phytoplankton communities and, on occasion, form blooms in estuaries and coastal ecosystems. While relationships between dinoflagellate bloom dynamics and nutrients are well-studied, information regarding bloom dissipation in estuaries is limited. We studied the dissipation of dinoflagellate Polykrikos geminatum blooms in the Pearl River Estuary, South China Sea, during August of 2011 using ecological, molecular, and satellite remote sensing data. We found that the dinoflagellate bloom was associated with water temperatures of 29.2–31 °C, salinities ranging 16.4–20, and ambient water nutrient concentrations that were not limited. The abundance of the ciliate Euplotes rariseta, which feeds on P. geminatum cell debris and bacteria, functions as an indicator species of P. geminatum bloom dissipation. In situ and satellite data indicate that bloom water masses were transferred from the central to inner estuary near Shenzhen Bay, driven by continuous, strong southerly winds; at which point in time, P. geminatum blooms dissipated to a high-salinity area near the estuary mouth driven by northerly winds and freshwater discharge, whereupon the blooms rapidly vanished. A low tolerance to low or high salinities resulted in P. geminatum bloom demise in the Pearl River Estuary. We propose that interactions among salinity, wind, and freshwater incursion result in P. geminatum bloom dissipation in the Pearl River Estuary. View Full-Text
Keywords: dinoflagellate; bloom dissipation; wind events; ciliate; salinity tolerance; estuary dinoflagellate; bloom dissipation; wind events; ciliate; salinity tolerance; estuary
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MDPI and ACS Style

Guo, Y.; Lin, S.; Huang, L.; Chen, Y.; Hu, S.; Liu, S.; Tan, Y.; Huang, X.; Qiu, D. Dissipation of a Polykrikos geminatum Bloom after Wind Events in Pearl River Estuary. Water 2022, 14, 2313. https://doi.org/10.3390/w14152313

AMA Style

Guo Y, Lin S, Huang L, Chen Y, Hu S, Liu S, Tan Y, Huang X, Qiu D. Dissipation of a Polykrikos geminatum Bloom after Wind Events in Pearl River Estuary. Water. 2022; 14(15):2313. https://doi.org/10.3390/w14152313

Chicago/Turabian Style

Guo, Yupei, Senjie Lin, Liangmin Huang, Yongqiang Chen, Simin Hu, Sheng Liu, Yehui Tan, Xiaoping Huang, and Dajun Qiu. 2022. "Dissipation of a Polykrikos geminatum Bloom after Wind Events in Pearl River Estuary" Water 14, no. 15: 2313. https://doi.org/10.3390/w14152313

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