大亚湾夏季浮游植物群落结构及对淡澳河输入的响应特征*

doi:10.11978/2020012

Abstract

Abstract:

Phytoplankton are the primary producer of aquatic ecosystem, and their community structure directly affects the health and safety of aquatic ecosystem. River input is one of the most important impacts reflecting the human activities on Daya Bay waters, which influences the phytoplankton community structure by changing environmental factors such as temperature, salinity, turbidity, nutrients, and so on. We investigated water environmental factors and phytoplankton community structure in Daya Bay in the summer of 2015 when large amount of river input happened. The dynamic change of phytoplankton community structure under the influence of the strong river input and its response to environmental factors were analyzed. The results showed that stratified waters with low salinity, high temperature, declined transparency, and enhanced nutrient concentrations formed at the Dan’ao River Mouth due to river input, while the waters in the middle and opening of Daya Bay were greatly affected by seawater intrusion. Freshwater input was the main external source of nitrogen and phosphorus nutrients in Daya Bay, and both freshwater input and invasive seawater were both important source of silicate. Nutrient structure was highly imbalanced in Daya Bay in summer, and dissolved inorganic phosphorus was the important limited factor of the growth of phytoplankton. Diatoms were the dominant group of phytoplankton in Daya Bay in summer 2015, and three dominant species included Thalassiosira minima, Skeletonema costatum and Thalassiosira rotula were identified. Cluster analysis showed that phytoplankton community in Daya Bay in summer 2015 could be mainly divided into three types. Type Ⅰ: Algae assemblage occurred at the Dan’ao River Mouth with high abundance of phytoplankton and bloom of Thalassiosira minima under influence of freshwater discharge; Type Ⅱ: algae assemblage dominated by Skeletonema costatum observed at the top and middle Daya Bay under subordinate influence of river plume; Type Ⅲ: algae assemblage with low phytoplankton abundance and no obvious dominant species mainly occurred in the opening of Daya Bay under the influence of sea water. The water environments at the Dan’ao River Mouth were beneficial to the growth and bloom of tiny chain-formed Thalassiosira minima, and the bloom occurred in the environmental gradient of temperature 30 ~ 31 °C, salinity 17 ‰ ~ 31 ‰ and water transparency 0.45 ~ 1.2 m. The difference in the utilization of different nutrients by diatoms and the subsequent settlement of biogenic detritus and particles resulted in a slight decrease of Si∶N ratio and a significant increase of N∶P ratio in the area where algae bloomed. The distribution of phytoplankton abundance was extremely uneven at the Dan’ao River Mouth due to the bloom of single species under the influence of freshwater discharge, which led to the decrease of Shannon-Wiener index and Pielou’s evenness index. The two indexes both increased from the Dan’ao River Mouth to the opening of Daya Bay.

Key words: Daya Bay, phytoplankton, river input, community structure, nutrients structure

CLC Number:

P735.121

ZHANG Liming, TAN Yehui, LI Jiajun, HUANG Xiaoping, LIU Jiaxing. Characteristics of the phytoplankton community and its response to Dan’ao River input in Daya Bay in summer*[J].Journal of Tropical Oceanography, 2020, 39(5): 43-54.

Figures/Tables 9

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References 43

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优势种	学名	优势度
极小海链藻	Thalassiosira minima	0.42
中肋骨条藻	Skeletonema costatum	0.25
圆海链藻	Thalassiosira rotula	0.04

Characteristics of the phytoplankton community and its response to Dan’ao River input in Daya Bay in summer*

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