Volume 19 Issue 6
Dec.  2023
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CHEN Liangdong, ZHAN Jianpo, WANG Qing. Community structure of phytoplankton and their indicative effect on water quality of Pearl River[J]. South China Fisheries Science, 2023, 19(6): 1-10. DOI: 10.12131/20230059
Citation: CHEN Liangdong, ZHAN Jianpo, WANG Qing. Community structure of phytoplankton and their indicative effect on water quality of Pearl River[J]. South China Fisheries Science, 2023, 19(6): 1-10. DOI: 10.12131/20230059
shu

Community structure of phytoplankton and their indicative effect on water quality of Pearl River

  • 1.

    Station of Guangzhou Agricultural and Mechanizational Extension, Guangzhou 510220, China

  • 2.

    Department of Ecology, Jinan University/Key Laboratory of Philosophy and Social Science in Guangdong Province, Guangzhou 510632, China

  • 3.

    Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China

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  • Received Date: March 15, 2023
  • Revised Date: April 24, 2023
  • Accepted Date: June 27, 2023
  • Available Online: June 29, 2023
    Graphical Abstract
    • Abstract

  • As the primary producer of river ecosystem, the dynamic changes of phytoplankton are related to the stability of fishery resources and water ecosystem. We investigated the community structure of phytoplankton in three typical sections of the Pearl River in dry season (March), wet season (July) and level season (November) in 2021, and evaluated the current situation of water quality by biodiversity and other indicators, so as to provide technical support for the Pearl River water pollution control and water ecological restoration. Results indicate that the species composition, abundance and dominant species of phytoplankton showed significant spatiotemporal changes (P<0.05). A total of 187 species were identified throughout the year (117 in March, 98 in July and 77 in November). The average cell abundance of phytoplankton was 8.6×105, 72.1×105 and 4.0×105 cells·L−1 , and the biomass was 1.235 4, 4.674 5 and 0.569 8 mg·L−1 in March, July and November, respectively. The abundance of Cyanophyta reached 1.18×107 cells·L−1 (Slight cyanobacteria bloom level) in Shijiao section of the Pearl River in wet season. The phytoplankton community structure in the upper reaches of the Pearl River changed from chlorophyta type in dry season to chlorophyta-cyanobacteria type in wet season, and Scenedesmus quadricauda, Merismopedia tenuissima and S. armatus var. boglariensis f. bicaudatus were the dominant species throughout the year. In the lower reaches, the phytoplankton community structure changed from diatomic type to diatom-cyanobacteria type, with Melosira granulata and M. tenuissima as the dominant species. Shannon-Wiener index (H'), Pielou index (J') and Margalef index (D) were 1.58–3.05, 0.51–0.84 and 1.60–3.42, respectively. According to the comprehensive evaluation based on the biodiversity indexes, the water quality in the three typical reaches of the Pearl River was between mild pollution and α-medium pollution, and the water quality still needs to be improved.

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