CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Marine Monitoring and Forecasting Center of Zhejiang Province, Hangzhou 310007, China.
CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Center of Ocean Mega-Science, Qingdao 266071, China.
Mar Pollut Bull. 2024 Aug;205:116590. doi: 10.1016/j.marpolbul.2024.116590. Epub 2024 Jun 15.
The Beibu Gulf has experienced blooms of Phaeocystis globosa "giant colony" ecotype (PGGCE), with noticeable variations in bloom scale across years. However, driving environmental factors and their roles remain poorly understood. In this study, we quantified dynamics of PGGCE cells in 2016-2017 and 2018-2019, and analyzed their correlations with environment factors. The results revealed that PGGCE blooms primarily occurred in Guangxi coast and western waters of Leizhou Peninsula during winter months, exhibiting distinct developmental processes. Bloom intensity, duration, and distribution differed significantly between two bloom events. In 2016-2017, peak PGGCE density exceeded 2.0 × 10 cells L nearly double that of 2018-2019. Furthermore, bloom sustained five months during 2016-2017, compared to three months during 2018-2019. Prolonged period of low temperatures and elevated nitrate concentrations favored PGGCE growth and colony formation, resulting in a larger scale bloom during winter 2016 as opposed to winter 2018.
北部湾经历了球形棕囊藻“巨囊型”生态型（PGGCE）的爆发，多年来爆发规模有明显变化。然而，驱动环境因素及其作用仍不清楚。本研究量化了 2016-2017 年和 2018-2019 年 PGGCE 细胞的动态，并分析了它们与环境因子的相关性。结果表明，PGGCE 藻华主要发生在冬季的广西沿海和雷州半岛西部海域，呈现出明显的发育过程。两次藻华事件的藻华强度、持续时间和分布有显著差异。在 2016-2017 年，PGGCE 密度峰值超过 2.0×10 个细胞/L，几乎是 2018-2019 年的两倍。此外，2016-2017 年藻华持续了五个月，而 2018-2019 年只有三个月。长时间的低温和硝酸盐浓度升高有利于 PGGCE 的生长和群体形成，导致 2016 年冬季藻华规模大于 2018 年冬季。
