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Ochieng B, Mbao EO, Zhang Z, Shi L, Liu Q. Phytoplankton community structure of Tang-Pu Reservoir: status and ecological assessment in relation to physicochemical variability. ENVIRONMENTAL MONITORING AND ASSESSMENT 2022; 194:382. [PMID: 35441323 DOI: 10.1007/s10661-022-09958-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Accepted: 03/19/2022] [Indexed: 06/14/2023]
Abstract
Seasonal variation in phytoplankton community structure within Tang-Pu Reservoir (Shaoxing city, Zhejiang province, China) was investigated in relation to variation in physicochemical and hydrological characteristics. Over the three-study seasons (autumn, winter, and spring), phytoplankton abundance and biomass showed a gradual increase with the peak in spring season. During this study period, phytoplankton community comprised of 7 phyla, 80 genera, and 210 species. The dominating phyla were Chlorophyta 80 species, Bacillariophyta 46, and Cyanophyta 44 as well as other phyla of freshwater ecosystems except Xanthophyta. The phytoplankton density and biomass varied in the six sampling sites between a minimum of 257.42 × 104 cells/L to 1054.15 × 104 cells/L and 1.60 mg/L to 4.56 mg/L respectively. Spring season had higher biomass and density values than autumn and winter. Furthermore, the results indicated that the Shannon-Wiener (H') and Pielou evenness (J') indices of phytoplankton community were stable although with slightly higher values in spring. Based on the calculated indices, Tang-Pu reservoir could be considered mesosaprobic in all the three seasons. Redundancy analysis (RDA) revealed that pH, total nitrogen (TN), total phosphorus (TP), transparency, chlorophyll a (Chl a), dissolve oxygen (DO), and water temperature (WT) were responsible for most phytoplankton community shift from Bacillariophyta and Cryptophyta to Cyanophyta and Chlorophyta in spring. These environmental parameters play an essential role in the community structure variation of phytoplankton in the downstream and upstream of Tang-Pu Reservoir. A decreasing phytoplankton abundance trend from the river area (inlet) to the lake (outlet) was also observed.
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Affiliation(s)
- Beryl Ochieng
- Centre for Research On Environmental Ecology and Fish Nutrition (CREEFN), Ministry of Agriculture, Shanghai Ocean University, Shanghai, 201306, China.
- College of Fisheries and Life Sciences, Lingang New District, Shanghai Ocean University, 999 Huchenghuan Road, Shanghai, 201306, People's Republic of China.
| | - Evance Omondi Mbao
- Department of Geosciences and The Environment, The Technical University of Kenya, PO Box, Nairobi, 52428-00200, Kenya
| | - Zhen Zhang
- Centre for Research On Environmental Ecology and Fish Nutrition (CREEFN), Ministry of Agriculture, Shanghai Ocean University, Shanghai, 201306, China
- College of Fisheries and Life Sciences, Lingang New District, Shanghai Ocean University, 999 Huchenghuan Road, Shanghai, 201306, People's Republic of China
| | - Liandong Shi
- Shaoxing Tang-Pu Reservoir Co. Ltd, Shangyu, 312364, Zhejiang, China
| | - Qigen Liu
- Centre for Research On Environmental Ecology and Fish Nutrition (CREEFN), Ministry of Agriculture, Shanghai Ocean University, Shanghai, 201306, China.
- College of Fisheries and Life Sciences, Lingang New District, Shanghai Ocean University, 999 Huchenghuan Road, Shanghai, 201306, People's Republic of China.
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