Phytoplankton Community Structure Characteristics and Analysis of Environmental Factors in Sea Area near Xiapu Changbiao Island

Abstract

In order to further understand the characteristics of phytoplankton community in the sea area near Changbiao Island in Xiapu, the data of phytoplankton and water environment from four cruises in May (spring), September (summer), December (autumn) and February (winter) in 2019—2020 were analyzed, and the characteristics of phytoplankton community structure were analyzed. The main environmental factors affecting the structure of phytoplankton community were studied by redundancy analysis. The results showed that there were 170 species of phytoplankton in 60 genera, 48 genera and 131 species of diatoms, 26 species of dinoflagellates in 10 genera, 2 species of cyanobacteria in 1 genera and 1 species of diatoms in 1 genera. Phytoplankton are mainly coastal wide-temperature and wide-salt species and warm water species. There are 13 dominant species throughout the year. In spring, Prorocentrum donghaiense and Noctiluca are the main species, and Skeletonema costatum and Siegesbeckia qiongshi are the main species in summer, autumn and winter. The spatial distribution of phytoplankton abundance shows a trend of high nearshore, low farshore, low in the south, and high in the north. Seasonal variation of phytoplankton is mainly affected by water temperature. Appropriate temperature and nutrients in spring and summer promote a large increase in phytoplankton, while autumn and winter are mainly affected by temperature. Now in spring and summer, the coastal nuclear power station of Changbiao Island in Xiapu should focus on monitoring the occurrence of red tide in spring and summer.

Keywords

• changbiao island
• phytoplankton
• community structure
• environmental factors