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Shiyan Reservoir is located in a typical high-density built-up area in Shenzhen, and its water environment quality and water ecological health are key to the safety and security of Shenzhen's drinking water. The 13-way water quality and water ecological indicators of Shiyan Reservoir were monitored for 14 months. The chlorophyll a concentration in Shiyan Reservoir ranged from 21.25 to 88.77 μg/L. The temporal heterogeneity of the chlorophyll a concentration was obvious, and the variation was drastic; the highest chlorophyll a concentration was from April to July, which was maintained at about 85 μg/L, and the risk of algal bloom was high. The annual average water temperature of Shiyan Reservoir is 25.31℃, and the water temperature from May to September is about 30℃ for a long time, so the risk of algal bloom is high. The COD of the reservoir is 1.71~3.08 mg/L, and the TOC is 2.22~5.13 mg/L. The organic pollution of the reservoir is very low, and it reaches the environmental quality of surface water Ⅰ standard. Transparency is 0.73~1.16m, relative to 2010~2015, the transparency of Shiyan Reservoir increased significantly. Shiyan Reservoir TN pollution is serious, during the investigation period, TN is 1.66~2.49 mg/L, for Class V water quality. In recent years, Shenzhen has carried out a systematic water environment comprehensive treatment project, TN decreased significantly, but it is still the primary pollutant in Shiyan Reservoir. Shiyan Reservoir TP 0.01 ~ 0.043 mg / L, total phosphorus concentration is low, to achieve the environmental quality of surface water Ⅰ ~ Ⅱ class standards. The monthly average integrated trophic state of the reservoir is located between 43.13 and 53.81, with an annual average value of 50.49. The monthly average integrated trophic state of April and November 2021 and April and May 2022 is less than 50, which is in the state of light eutrophication, and the other months are in the state of moderate eutrophication. The correlation analysis showed that water temperature was the primary influence factor of phytoplankton in flood season, and the correlation coefficient was as high as 0.69. The main correlation factors of phytoplankton in flood season were WT, TOC, nitrate nitrogen, and SD, and the main correlation factors of phytoplankton in dry season were TOC, DO, and WT. Throughout the whole year, phytoplankton was highly positively correlated with WT, TOC, moderately positively correlated with COD, pH, and turbidity, and moderately negatively correlated with transparency (SD). SD was moderately negatively correlated. Twofactor ANOVA showed that the variance of each environmental factor was better explained by the period and sampling site and the interaction effect between the two (R 2 ranging from 23.7% to 78.1%). The main influence of environmental factors in Shiyan Reservoir was period, and the temporal heterogeneity of environmental factors was significantly higher than the spatial heterogeneity. A total of 21 genera of cyanobacteria, 24 genera of diatoms, 39 genera of chlorophyta, 3...
Shiyan Reservoir is located in a typical high-density built-up area in Shenzhen, and its water environment quality and water ecological health are key to the safety and security of Shenzhen's drinking water. The 13-way water quality and water ecological indicators of Shiyan Reservoir were monitored for 14 months. The chlorophyll a concentration in Shiyan Reservoir ranged from 21.25 to 88.77 μg/L. The temporal heterogeneity of the chlorophyll a concentration was obvious, and the variation was drastic; the highest chlorophyll a concentration was from April to July, which was maintained at about 85 μg/L, and the risk of algal bloom was high. The annual average water temperature of Shiyan Reservoir is 25.31℃, and the water temperature from May to September is about 30℃ for a long time, so the risk of algal bloom is high. The COD of the reservoir is 1.71~3.08 mg/L, and the TOC is 2.22~5.13 mg/L. The organic pollution of the reservoir is very low, and it reaches the environmental quality of surface water Ⅰ standard. Transparency is 0.73~1.16m, relative to 2010~2015, the transparency of Shiyan Reservoir increased significantly. Shiyan Reservoir TN pollution is serious, during the investigation period, TN is 1.66~2.49 mg/L, for Class V water quality. In recent years, Shenzhen has carried out a systematic water environment comprehensive treatment project, TN decreased significantly, but it is still the primary pollutant in Shiyan Reservoir. Shiyan Reservoir TP 0.01 ~ 0.043 mg / L, total phosphorus concentration is low, to achieve the environmental quality of surface water Ⅰ ~ Ⅱ class standards. The monthly average integrated trophic state of the reservoir is located between 43.13 and 53.81, with an annual average value of 50.49. The monthly average integrated trophic state of April and November 2021 and April and May 2022 is less than 50, which is in the state of light eutrophication, and the other months are in the state of moderate eutrophication. The correlation analysis showed that water temperature was the primary influence factor of phytoplankton in flood season, and the correlation coefficient was as high as 0.69. The main correlation factors of phytoplankton in flood season were WT, TOC, nitrate nitrogen, and SD, and the main correlation factors of phytoplankton in dry season were TOC, DO, and WT. Throughout the whole year, phytoplankton was highly positively correlated with WT, TOC, moderately positively correlated with COD, pH, and turbidity, and moderately negatively correlated with transparency (SD). SD was moderately negatively correlated. Twofactor ANOVA showed that the variance of each environmental factor was better explained by the period and sampling site and the interaction effect between the two (R 2 ranging from 23.7% to 78.1%). The main influence of environmental factors in Shiyan Reservoir was period, and the temporal heterogeneity of environmental factors was significantly higher than the spatial heterogeneity. A total of 21 genera of cyanobacteria, 24 genera of diatoms, 39 genera of chlorophyta, 3...
Aim This study aims to analyze the scientific literature on phytoplankton in assessing lake water quality, based on bibliometric and network techniques. Methods PRISMA criteria were adopted to produce reliable results. The Scopus and Web of Science databases were consulted to retrieve the documents to be studied. The number of publications, citations and bibliographic coupling were techniques used to identify relevant journals, countries, authors, and articles. The conceptual evolution was analyzed by keywords co-occurrence and thematic mapping. Results Based on 2429 documents selected from the 1973-2023 annual period, the main results indicated 519 journals, 6450 authors, 54907 references, and 4844 keyword authors, among others. The annual growth index was 10.27%, reflecting the upward trend at the time. Erick Jeppesen resulted as the top influential author, China leaded in publications and collaborations with The United States of America. Hydrobiologia was the top journal. Top influential articles content theme related to cyanobacterial blooms. According to the results of the analysis of the conceptual framework, phytoplankton, water quality, eutrophication, and cyanobacteria were the most relevant themes. Furthermore, the trending topics were mainly climate change and degradation. Conclusions This comprehensive analysis allowed us to interpret the development of research related to the subject of assessing lake water quality.
Lakes play a vital role in supporting biodiversity, providing water resources, regulating climate, cycling nutrients, and offering recreational opportunities. Despite their importance for environmental health and human well-being, lakes face significant pressures in the Anthropocene era. The present work seeks to assess the species-environment interactions and the ecological status of six lakes in the Western Black Sea basin of Türkiye utilizing phytoplankton metrics during wet and dry periods. Canonical correspondence analysis revealed a significant correlation equal to 98.5% between phytoplankton species and environmental stressors during two hydrological periods. Electrical conductivity (EC), pH, total organic carbon (TOC), and temperature were the most influential environmental factors affecting phytoplankton distribution in lakes (p=0.002). Lake Sarıkum, a brackish habitat, was under high EC and pH pressure and is characterized by pollution-tolerant species. Lake Yeniçağa associated with TOC is characterized by some species, such as Anabaenopsis milleri, Chroococcus turgidus, Pseudoschroederia robusta, Aphanocapsa sp., Merismopedia glauca, Micractinium quadrisetum, and Microcystis aeruginosa. Lake Abant is located on the opposite side of EC, TOC, and temperature, which was associated with some species such as Cymbella affinis, Achnanthidium minutissimum, Encyonema minutum, E. silesiacum, and Dinobryon divergens. Results of the phyto-assessment displayed that the ecological status (ES) of the sampling stations during the rainy and dry periods varied from bad to high. The modified phytoplankton trophic index (MPTI) exhibited that a moderate ES was found in Lakes Sarıkum and Yeniçağa, while others had a good ES. The present study confirmed that phytoplankton communities are strongly linked to the ecological status of lakes in the Western Black Sea basin, which could be assessed using the MPTI.
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