Study on the Seasonal Succession of Phytoplankton Community and Its Driving Factors in Chaohu Lake
In order to understand the seasonal dynamic variations of phytoplankton community composition in Chaohu Lake and their relationship with environmental factors,water samples were systematically collected in January,April,July,and October in 2022 to investigate and analyze the water quality and phytoplankton changes in Chaohu Lake.The results revealed that 110 phytoplankton species,representing 60 genera distributed across seven phyla were identified during the monitoring period,mainly chlorophyta,cyanobacteria,and bacillariophyta.The study unveiled pronounced spatio-temporal variations in phytoplankton community composition and cell density,providing critical insights into the dynamics of phytoplankton populations.Furthermore,the study assessed phytoplankton diversity,ranking it in descending order from highest to lowest as follows:October(fall),April(spring),July(summer),and January(winter).Additionally,the investigation highlighted a distinct westward trend in water blooms across Chaohu Lake.The prevailing species and genera of phytoplankton included Microcystis spp.,Dolichospermum flos-aquae,Aphanizomenon flos-aquae,Pseudanabaena mucicola,Komma caudata,Cryptomonas erosa,and Nitzschia acicularis.Dolichospermum flos-aquae demonstrated prevalence during the winter and spring,while Microcystis spp.dominated during the summer and autumn.Moreover,Dolichospermum flos-aquae and Microcystis spp.exhibited distinct patterns of seasonal succession,shedding light on their ecological dynamics.Redundancy Analysis(RDA)was conducted to identify the primary environmental factors influencing the phytoplankton community.The results indicated that dissolved oxygen,electrical conductivity,and pH were the pivotal environmental parameters shaping the phytoplankton community structure.Pearson correlation analysis further substantiated these findings by revealing significant correlations between the seasonal succession of Dolichospermum flos-aquae,Microcystis spp.,and various environmental factors,including total phosphorus,water temperature,dissolved oxygen,Secchi depth,turbidity,and electrical conductivity.The findings of this study provide crucial theoretical data for a comprehensive understanding of the aquatic ecosystem status in Chaohu Lake.Additionally,they offer valuable insights into managing the water environment in this region,serving as a foundation for sustainable environmental practices and policies.
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