Eutrophication has become one of the most serious problems facing water environments. Exploring relationship between anthropogenic activities and river trophic status provides effective information for environmental improvement restoration, whilst remains poorly understood. Herein, 5225 samples were collected monthly from 12 tributaries covered upstream in Three Gorges Reservoir, China during 2014–2020. Quantitative based on land-use covers used to establish correlations with tributary...

Cadmium ion (Cd2+) is a highly toxic metal in water, even at low concentrations. Microalgae are promising material for heavy remediation. The present study investigated the effects of Cd2+ on growth, photosynthesis, antioxidant enzyme activities, cell morphology, and adsorption accumulation capacity freshwater green alga Scenedesmus obliquus. Experiments were conducted by exposing S. obliquus to varying concentrations 96 h, assessing its tolerance removal towards Cd2+. results showed that...

The integrated rice-crayfish culture (IRCC) mode has been developed for more than twenty years in China, but little information could be obtained on the microbial communities paddy soil under this mode. This study used 16SrRNA and ITS Illumina high-throughput sequencing to investigate communities, diversity, function different IRCC times (0, 2, 4, 6, 10 years). With increasing time, altered relative abundance of dominant taxa, showing a significant decrease Actinobacteria Chytridiomycota,...

Periphytic algae exist widely in different waters. However, little is known about periphytic long-distance water diversion channels across watersheds. We investigated the and environmental factors at twenty sampling sites middle route of South-to-North Water Diversion Project (MRP). The dominant species were Desmodesmus intermedius (Hegewald), Calothrix thermalis (Bornet & Flahault), parietina Flahault) Leptolyngbya benthonica (Anagnostidis) (dominance > 0.02) as measured a whole...

A detailed understanding the metals binding with algal organic matter (AOM) is essential to gain a deeper insight into toxicity and migration of in algae cell. However, molecular complexation mechanism AOM remains unclear. In this study, cadmium ion (Cd2+) properties AOMs from Scenedesmus obliquus, which included extracellular (EOM) intracellular (IOM), were screened. When Cd2+ < 0.5 mg/L, accumulation could reach 40%, while > was only about 10%. EOM decreased gradually (from 8.51 3.98...

Euglena, a flagellated unicellular protist, has recently received widespread attention for various high-value metabolites, especially paramylon, which was only found in Euglenophyta. The limited species and low biomass of Euglena impeded paramylon exploitation utilization. This study established an optimal cultivation method pisciformis AEW501 production under mixotrophic cultivation. results showed that the optimum conditions were 20 °C, pH 7.0, 63 μmol photons m-2∙s-1, concentrations...

Introduction Taste and odor (T&amp;amp;O) problems have been affecting drinking water safety. As a eutrophicated reservoir in Tianjin city, the Yuqiao Reservoir was threatened by 2-MIB geosmin recent years. Methods In this study, quantile regression analysis metagenome were used to quickly accurately screen producers drivers of reservoir. Results The mean concentrations four-year 103.58 ± 128.13 ng/L 14.29 27.95 ng/L, respectively. higher summer autumn, with bimodal variation throughout...

Periphytic algal colonization is common in aquatic systems, but its interspecific competition remains poorly understood. In order to fill the gap, process of periphytic Middle Route South North Water Diversion Project was studied. The results showed that divided into three stages: initial stage (T1, 3–6 days), community formation (T2, 12–18 days) and primary succession (T3, 24–27 days). T1, dominant species were Diatoma vulgaris (Bory), Navicula phyllepta (Kützing) Fragilaria...

has been proven as a potential resource for large-scale astaxanthin production, but little information on phytohormones its growth and accumulation could be obtained. This study explored the impact of gibberellic acid-3 (GA3) biosynthesis in heterotrophic

Humans have altered the earth in unprecedented ways, and these changes profound implications for global climate change. However, impacts of human pressures on carbon dioxide (CO2) emissions over long time scales not yet been clarified. Here, we used footprint index (HF), which estimates ecological humans a given location, to explore CO2 China from 2000 2017. Human (+13.6%) (+198.3%) are still rise during 2000–2017 unevenly distributed spatially. There was significant positive correlation...

Free available chlorine has been and is being applied in global water treatment readily reacts with dissolved organic matter (DOM) aquatic environments, leading to the formation of chlorinated products. Chlorination enhances photoreactivity DOM, but influence compounds on photogeneration hydroxyl radicals (•OH) remained unexplored. In this study, a range carboxylate-substituted phenolic model were employed assess their •OH capabilities. These demonstrated substantial capacity for production,...

为了解南水北调中线干渠浮游植物群落的时空格局,自2018年8月开始分4个季度对干渠沿程的11个样点进行采样调查,同步开展水环境调查;共检出浮游植物7门83属145种,物种丰富度上,硅藻种类数最多,绿藻和蓝藻分别占第2和第3位,且春季>秋季>冬季>夏季;优势种包括极小曲丝藻(Achnanthidum minutissimum)、桥弯藻(Cymbella sp.)、空星藻(Coelastrum sphaericum)、衣藻(Chlamydomonas sp.)等(优势度Y>0.02);全年叶绿素a浓度为(4.09±2.89)μg/L,细胞密度为(6.79±7.15)×10⁶...

Cadmium is one of the major heavy metal pollutants in environment. However, toxicity targets and response mechanisms photosynthetic organisms to cadmium are lacking. This study explored physiological Synechocystis sp. PCC 6803 stress; resistance mechanism were screened. The results showed that led an increase reactive oxygen species content, superoxide dismutase activity, lipid peroxidation level, which damaged cell’s photosynthesis ultrastructure. cross-omics analysis found 1073...