Abstract
Abstract To find effective measures to control the water quality of the Hongmen Reservoir, it is necessary to better understand its phytoplankton composition, abundance and spatial and temporal distribution. Samples were collected at three sampling sites in January (dry season), May (wet season) and September (normal season) in 2019. Trophic level and stability status were assessed on the basis of the Shannon diversity index (H), species richness (S) and evenness (J) index. The different relationships between phytoplankton and the concentrations of several physicochemical parameters and the main soluble nutrients were evaluated by statistical tests. The results showed that there were 75 species belonging to seven groups of phytoplankton, including Chlorophyta (44 species), Bacillariophyta (12 species), Cyanophyta (9 species) and others (10 species). The phytoplankton community composition belongs to the Chlorophyta–Bacillariophyta–Cyanobacteria type structure; and Microcystis, Anabaena azotica Ley, Aphanizomenon, Melosira granulata were the main contributors to the dissimilarities in the temporal distributions of their communities. The phytoplankton density ranged from 4.42 × 106 to 8.99 × 106 particles/L, with an average of 6.45 × 106 particles/L, and the biomass was 4.42 × 106 ∼ 8.99 × 106 particles/L, with an average of 6.45 × 106 particles/L. The variation ranges of the Shannon–Wiener index (H′), Margalef index (D) and Pielou evenness index (J) were 2.05 ∼ 2.85, 4.12 ∼ 6.60 and 0.61–0.78, respectively. This research shows that the water in the Hongmen Reservoir is clean and that the pollution level is light. The correlation analysis shows that total phosphorus and dissolved oxygen are the main factors affecting phytoplankton community structure in the Hongmen Reservoir.
Highlights
Phytoplankton are one of the key components of aquatic ecosystems and play an important role in maintaining the balance of aquatic ecosystems (Padedda et al )
The results indicate that environmental temperature, total phosphorus (TP), correlated with the permanganate index (CODMn), BOD5, ammonia nitrogen and total nitrogen (TN) concentration are the main environmental factors affecting phytoplankton abundance
Zhou Yaping’s study in 2007 found that the composition of phytoplankton in the Hongmen Reservoir was dominated by chlorophyta, Bacillariophyta and cyanobacteria, accounting for 87.6% of the total
Summary
Phytoplankton are one of the key components of aquatic ecosystems and play an important role in maintaining the balance of aquatic ecosystems (Padedda et al ). Many researchers have conducted studies on the succession of phytoplankton in seas, lakes and reservoirs and have found that nutrients, water temperature and light availability are the main influencing factors (Liu et al ; Dantas et al ; Sabater-Liesa et al ). Phytoplankton biomass is the key parameter reflecting the ecological effect of eutrophication in lakes and reservoirs (Dantas et al ; Fetahi et al ). Monitoring, simulation and forecasting of the phytoplankton community are of great importance in anthropogenically affected areas, protected areas and reservoirs serving as drinking water supplies or recreation, especially currently, when changes are affected by human activities. Rapid economic development and human activities in and near the Hongmen Reservoir have changed estuarine dynamics, increasing the pressure on ecosystem management (Gong et al ). The relationship between phytoplankton and environmental factors in the Hongmen Reservoir has not yet been reported
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
