Seasonal and Long-Term Behavior of TN:TP Ratio in Lake Cajititlán and Its Environmental Implications

Anda, José de; Gradilla‐Hernández, Misael Sebastian; Díaz-Torres, Osiris; Díaz-Vázquez, Diego

doi:10.1007/s11270-022-05566-0

Cited by 3 publications

(3 citation statements)

References 39 publications

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“…These findings might be attributed to the influence of the variation in temperature and water volume. The results are consistent with those in previous studies in water quality objectives ( Liu et al, 2020 ; Bai et al, 2022 ; de Anda et al, 2022 ; Zhong et al, 2022 ; Zhen-Zhen et al, 2023 ). These results indicate that environmental conditions could affect cyanobacteria abundance.…”

Section: Discussionsupporting

confidence: 93%

“…Meanwhile, photos were taken to record visible changes in water quality during the flood (August 2020) and non-flood periods (August 2021) ( Figure 1B ). The settled water samples were digested for the analysis of total nitrogen (TN) and total phosphorus (TP) immediately after sampling ( Liu et al, 2020 ; Bai et al, 2022 ; de Anda et al, 2022 ; Zhong et al, 2022 ; Zhen-Zhen et al, 2023 ). Subsequently, testing is performed after digestion.…”

Section: Methodsmentioning

confidence: 99%

“…Next, we performed the concentration measurement of TP in the processed water samples by comparing calibration curves ( R 2 = 0.9991). TDP was determined the same way ( Liu et al, 2020 ; Bai et al, 2022 ; de Anda et al, 2022 ; Zhong et al, 2022 ; Zhen-Zhen et al, 2023 ). All chemical reagents in this study were applied with guaranteed reagent (Merck Co. Ltd., Darmstadt Germany).…”

Section: Methodsmentioning

confidence: 99%

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Effects of the catastrophic 2020 Yangtze River seasonal floods on microcystins and environmental conditions in Three Gorges Reservoir Area, China

Zhou,

Wang,

Xiao

et al. 2024

Front. Microbiol.

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IntroductionDuring July and August 2020, Three Gorges Reservoir Area (TGRA) suffered from catastrophic seasonal floods. Floods changed environmental conditions and caused increase in concentration of microcystins (MCs) which is a common and potent cyanotoxin. However, the effects and seasonal variations of MCs, cyanobacteria, and environmental conditions in TGRA after the 2020 Yangtze River extreme seasonal floods remain largely unclear, and relevant studies are lacking in the literature.MethodsA total of 12 representative sampling sites were selected to perform concentration measurement of relevant water quality objectives and MCs in the representative area of the TGRA. The sampling period was from July 2020 to October 2021, which included the flood period. Organic membrane filters were used to perform the DNA extraction and analyses of the 16S rRNA microbiome sequencing data.ResultsResults showed the seasonal floods result in significant increases in the mean values of microcystin-RR (MCRR), microcystin-YR (MCYR), and microcystin-LR (MCLR) concentration and some water quality objectives (i.e., turbidity) in the hinterland of TGRA compared with that in non-flood periods (p < 0.05). The mean values of some water quality objectives (i.e., total nitrogen (TN), total phosphorus (TP), total dissolved phosphorus (TDP), and turbidity), MC concentration (i.e., MCRR, MCYR, and MCLR), and cyanobacteria abundance (i.e., Cyanobium_PCC-6307 and Planktothrix_NIVA-CYA_15) displayed clear tendency of increasing in summer and autumn and decreasing in winter and spring in the hinterland of TGRA.DiscussionsThe results suggest that seasonal floods lead to changes in MC concentration and environmental conditions in the hinterland of TGRA. Moreover, the increase in temperature leads to changes in water quality objectives, which may cause water eutrophication. In turn, water eutrophication results in the increase in cyanobacteria abundance and MC concentration. In particular, the increased MC concentration may further contribute to adverse effects on human health.

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