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| Community Characteristics of Phytoplankton: a Case in a Macrophyte-Dominated Sub-Lake of Baiyangdian Lake during Overgrowth Period of Submerged Macrophytes |
| LIU Yang1,2, LI Zhifei1,3, ZHANG Xiaoke4, LIU Xueguang5, XIE Jun1,3, WANG Guangjun1,3, ZHANG Junwang1,2 |
1. Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China;
2. National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China;
3. Guangdong Ecological Remediation of Aquaculture Pollution Research Center, Guangzhou 510380, China;
4. Research Center of Aquatic Organism Conservation and Water Ecosystem Restoration in Anhui Province, Anqing Normal University, Anqing 246133, China;
5. Liaoning Province Engineering Center of Modern Agricultural Production Base, Shenyang 110003, China |
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Abstract Species composition, cell abundance, and biomass of phytoplankton were surveyed in 4 sampling zones with 4 sampling site in each zone in overgrowth of submerged macrophytes in Baiyangdian Lake (Shihoudian Sub-lake) in August 2018 to understand the community characteristics of phytoplankton during the explosive reproduction period of submerged macrophytes. The status of water quality was evaluated during the overgrowth period. A total of 68 species (51 genera) of phytoplankton were observed over a total cultured period, belonging to six major functional groups, i.e, Chlorophyta (30 species), Bacillariophyta (16 species), Cyanophyta (16 species), Euglenophyta (3 species), Pyrrophyta (1 species), and Cryptophyta (1 species), with phytoplankton abundance of 5.68×106—17.24×106 cells/L (average 9.13×106 cells/L)and phytoplankton biomass of 1.42—8.71 mg/L (average 4.61 mg/L). Redundancy analysis revealed that transparency, total dissolved solids, conductivity and pH were the most important environmental factors affecting the spatial distribution of phytoplankton species composition in summer. The water quality of Shihoudian Sub-lake was found to be β-meso-polluted to oligo-polluted judging from the phytoplankton diversity evaluation. Compared with algal regions and non-overgrowth period in Baiyangdian Lake, the characteristics of phytoplankton community in the overgrowth period of submerged macrophytes displayed a great difference.The finding provides support for ecological restoration and functional enhancement of macrophyte-dominated sub-lake.
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Received: 09 April 2020
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