Seasonal Succession of Bacterial Communities in Three Eutrophic Freshwater Lakes

Abstract

Urban freshwater lakes play an indispensable role in maintaining the urban environment and are suffering great threats of eutrophication. Until now, little has been known about the seasonal bacterial communities of the surface water of adjacent freshwater urban lakes. This study reported the bacterial communities of three adjacent freshwater lakes (i.e., Tangxun Lake, Yezhi Lake and Nan Lake) during the alternation of seasons. Nan Lake had the best water quality among the three lakes as reflected by the bacterial eutrophic index (BEI), bacterial indicator (Luteolibacter) and functional prediction analysis. It was found that Alphaproteobacteria had the lowest abundance in summer and the highest abundance in winter. Bacteroidetes had the lowest abundance in winter, while Planctomycetes had the highest abundance in summer. N/P ratio appeared to have some relationships with eutrophication. Tangxun Lake and Nan Lake with higher average N/P ratios (e.g., N/P = 20) tended to have a higher BEI in summer at a water temperature of 27 °C, while Yezhi Lake with a relatively lower average N/P ratio (e.g., N/P = 14) tended to have a higher BEI in spring and autumn at a water temperature of 9–20 °C. BEI and water temperature were identified as the key parameters in determining the bacterial communities of lake water. Phosphorus seemed to have slightly more impact on the bacterial communities than nitrogen. It is expected that this study will help to gain more knowledge on urban lake eutrophication.

Spatio-temporal fish gill microbiota analysis as indicators in estuarine fish health monitoring

“…Their microbiota composition showed a diminished amount of estuarine core but increased estuarine bacterioplankton taxa, suggesting a two-step microbiome adaptation: an initial increase of bacterioplankton-shared taxa that compete best for niches in the host environment at a given salinity (Schmidt et al, 2015) rising with residence time during the one-month ascent process (Borchardt, 1998). In here, Luteolibacter, a marine and freshwater taxon (Ji et al, 2021) associated with bacterial dysbiosis in sh (Kakakhel et al, 2023;Mondal et al, 2022;Sun et al, 2021) became dominant. The taxon was shown to antagonize pathogen growth contributing to micro ora resilience by niche colonization and might further be involved in epithelial tissue repair (Nakatani & Hori, 2021) which could serve bene cial roles during deep-reorganization in migrating smelt.…”

Monitoring Total Phosphorus Concentration in the Middle Reaches of the Yangtze River Using Sentinel-2 Satellites

“…For example, Liu et al [38] added the environmental parameter K (The K value depends on the average chlorophyll concentration of Wuhan lakes in different months: January-April, K = 1; May, June, December, K = 2; July-November, K = 3) to the input parameters when retrieving the Trophic Level Index of Wuhan lakes, and the accuracy of the model was significantly improved. Because the growth of algae and the concentration of pollutants in lakes are affected by seasonal changes in temperature and water level [45][46][47], Yang et al [27] added temperature and water level to the TLI retrieval model of Honghu Lake to improve the stability and applicability of the model. In this study, we added turbidity to the TP retrieval model, the stability and accuracy of the model were improved (Figure 5), this model is an empirical algorithm and indirect estimation, which relies on a large amount of measured data and has no strict theoretical basis, so it is only applicable to TP retrieval in the MYR, and is not applicable in other regions.…”

Research on Microclimate-Suitable Spatial Patterns of Waterfront Settlements in Summer: A Case Study of the Nan Lake Area in Wuhan, China

“…Nan Lake, the third largest urban lake in Wuhan, is located in Hongshan District, and it has a water area of 7.6 square kilometers [37]. The lake, featuring a synthesis of natural and artificial subsurfaces, and its formation, development, and evolution have played an unnoticeable role in shaping the natural and human environments of the surrounding areas.…”