Journal of Tropical Oceanography >
Analysis of the bloom caused by colonial Phaeocystis globosa in Mirs Bay
Copy editor: LIN Qiang
Received date: 2021-11-01
Revised date: 2021-12-18
Online published: 2021-12-23
Supported by
Natural Science Foundation of China(41606176)
A bloom caused by giant colonies of Phaeocystis globosa was observed in Mirs Bay in late January 2021. To better understand the bloom dynamics and their controlling factors, in situ investigations on phytoplankton succession, colony numbers and size, inorganic nutrient concentrations, and other environmental factors were conducted from Jan. 20 to Feb. 1, 2021. The phytoplankton bloom, initiated by an early Skeletonema costatum bloom, was followed by a large bloom of P. globosa. Phytoplankton community was dominated by the population of Akashiwo sanguinea after the decline of P. globosa bloom. The maximum colony density observed during the P. globosa bloom was up to 69 colonies ·L-1, while colony diameters were up to 1.2 cm. Analytic results showed that ammonium and nitrate were the key environmental factors that initiated the P. globosa bloom. In addition, turbulence and competitive advantage over S. costatum under phosphate limitation might also play important roles in the occurrence of the bloom. The bloom of A. sanguine could be the major cause for the decline of P. globosa bloom. Overall, the P. globosa bloom was a combined result of various physical and chemical factors and biotical factors.
Key words: Mirs Bay; Phaeocystis globosa; bloom; environmental factors
LIU Yue , LI Li , ZHAI Xiaohui , ZHOU Juan , YE Penghao , HUANG Shengdong . Analysis of the bloom caused by colonial Phaeocystis globosa in Mirs Bay[J]. Journal of Tropical Oceanography, 2022 , 41(3) : 164 -171 . DOI: 10.11978/2021148
图5 调查期间环境因子主成分分析蓝色表示硅藻藻华期, 橙色表示球形棕囊藻藻华期, 绿色表示甲藻藻华期 Fig. 5 Principal component analysis of environmental parameters in Mirs Bay during the bloom. Blue ellipse represents diatom bloom, orange ellipse represents Phaeocystis globosa bloom, and green ellipse represents dinoflagellate bloom |
表1 球形棕囊藻囊体丰度与环境因子关联度Tab. 1 The value of grey association degree between Phaeocystis globosa colony density and each environmental factor |
序号 | 环境因子 | 关联系数 |
---|---|---|
1 | 铵盐 | 0.7024 |
2 | 硝酸盐 | 0.6957 |
3 | 溶解氧 | 0.6886 |
4 | 盐度 | 0.6854 |
5 | pH | 0.6847 |
6 | 温度 | 0.6836 |
7 | 硅酸盐 | 0.6785 |
8 | 磷酸盐 | 0.6537 |
9 | 亚硝酸盐 | 0.6520 |
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