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Pan X, Lin L, Cao X, Jing Z, Dong L, Zhai W. Response of microbial communities and biogeochemical cycling functions to sediment physicochemical properties and microplastic pollution under damming and water diversion projects. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 940:173209. [PMID: 38754501 DOI: 10.1016/j.scitotenv.2024.173209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 05/05/2024] [Accepted: 05/11/2024] [Indexed: 05/18/2024]
Abstract
Understanding the interactions among flow-sediment, microorganisms, and biogeochemical cycles is crucial for comprehending the ecological response mechanisms of dams and water diversion. This study focused on the spatial patterns of carbon, nitrogen, phosphorus, and sulfur (CNPS) cycle functional genes in the water resource for the middle route of the South-to-North Water Diversion Project in China, specifically the Danjiangkou Reservoir (comprising the Han and Dan reservoirs). The investigation incorporated sediment physicochemical properties and microplastic pollution. Numerous microbial species were identified, revealing that microbial communities demonstrated sensitivity to changes in sedimentary mud content. The communities exhibited greater β diversity due to finer sediment particles in the Han Reservoir (HR), whereas in the Dan Reservoir (DR), despite having higher sediment nutrient content and MPs pollution, did not display this pattern. Regarding the composition and structure of microbial communities, the study highlighted that sediment N and P content had a more significant influence compared to particle size and MPs. The quantitative microbial element cycling (QMEC) results confirmed the presence of extensive chemolithotrophic microbes and strong nitrogen cycle activity stemming from long-term water storage and diversion operations. The denitrification intensity in the HR surpassed that of the DR. Notably, near the pre-dam area, biological nitrogen fixation, phosphorus removal, and sulfur reduction exhibited noticeable increases. Dam construction refined sediment, fostering the growth of different biogeochemical cycling bacteria and increasing the abundance of CNPS cycling genes. Furthermore, the presence of MPs exhibited a positive correlation with S cycling genes and a negative correlation with C and N cycling genes. These findings suggest that variations in flow-sediment dynamics and MPs pollution have significant impact the biogeochemical cycle of the reservoir.
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Affiliation(s)
- Xiong Pan
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China; Innovation Team for Basin Water Environmental Protection and Governance of Changjiang Water Resources Commission, Wuhan 430010, China
| | - Li Lin
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China; Innovation Team for Basin Water Environmental Protection and Governance of Changjiang Water Resources Commission, Wuhan 430010, China.
| | - Xiaohuan Cao
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China
| | - Zheng Jing
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China; Innovation Team for Basin Water Environmental Protection and Governance of Changjiang Water Resources Commission, Wuhan 430010, China
| | - Lei Dong
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China; Innovation Team for Basin Water Environmental Protection and Governance of Changjiang Water Resources Commission, Wuhan 430010, China
| | - Wenliang Zhai
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China
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Tang B, Hung W, Salam M, Zhang L, Yang Y, Niu J, Li H, Zhang L. Suspended particulate matter-biofilm aggregates benefit microcystin removal in turbulent water but trigger toxicity toward Daphnia magna. WATER RESEARCH 2024; 263:122150. [PMID: 39084089 DOI: 10.1016/j.watres.2024.122150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 07/23/2024] [Accepted: 07/24/2024] [Indexed: 08/02/2024]
Abstract
Suspended particulate matter (SPM) and biofilm are critical in removing contaminants in aquatic environments, but the environmental behavior and ecological toxicity of SPM-biofilm aggregates modulated by turbulence intensities are largely unknown. This study determined the removal pathways of microcystin-LR (MC-LR) by SPM and its biofilm under different turbulence intensities (2.25 × 10-3, 1.01 × 10-2, and 1.80 × 10-2 m2/s3). Then, we evaluated the toxicity of SPM-biofilm aggregates to Daphnia magna. The results revealed that SPM contributed to the adsorption of MC-LR, and the removal of MC-LR can be accelerated with biofilm formation on SPM, with 95.66 % to 97.45 % reduction in MC-LR concentration under the studied turbulence intensities. Higher turbulence intensity triggered more frequent contact of SPM and MC-LR, formed compact but smaller clusters of SPM-biofilm aggregates, and enhanced the abundance of mlrA and mlrB; thus benefiting the adsorption, biosorption, and biodegradation of MC-LR. Furthermore, the SPM-biofilm aggregates formed in turbulent water triggered oxidative stress to Daphnia magna, while a weak lethal toxic effect was identified under moderate turbulence intensity. The results indicate that the toxicity of SPM-biofilm aggregates fail to display a linear relationship with turbulence intensity. These findings offer new perspectives on understanding the environmental behavior and ecological outcomes of SPM and its biofilms in turbulent aquatic environments.
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Affiliation(s)
- Bingran Tang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Wei Hung
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Muhammad Salam
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Lixue Zhang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Yongchuan Yang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China
| | - Junfeng Niu
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Hong Li
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China.
| | - Lilan Zhang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China.
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Revealing Physiochemical Factors and Zooplankton Influencing Microcystis Bloom Toxicity in a Large-Shallow Lake Using Bayesian Machine Learning. Toxins (Basel) 2022; 14:toxins14080530. [PMID: 36006192 PMCID: PMC9413751 DOI: 10.3390/toxins14080530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 07/22/2022] [Accepted: 07/26/2022] [Indexed: 12/10/2022] Open
Abstract
Toxic cyanobacterial blooms have become a severe global hazard to human and environmental health. Most studies have focused on the relationships between cyanobacterial composition and cyanotoxins production. Yet, little is known about the environmental conditions influencing the hazard of cyanotoxins. Here, we analysed a unique 22 sites dataset comprising monthly observations of water quality, cyanobacterial genera, zooplankton assemblages, and microcystins (MCs) quota and concentrations in a large-shallow lake. Missing values of MCs were imputed using a non-negative latent factor (NLF) analysis, and the results achieved a promising accuracy. Furthermore, we used the Bayesian additive regression tree (BART) to quantify how Microcystis bloom toxicity responds to relevant physicochemical characteristics and zooplankton assemblages. As expected, the BART model achieved better performance in Microcystis biomass and MCs concentration predictions than some comparative models, including random forest and multiple linear regression. The importance analysis via BART illustrated that the shade index was overall the best predictor of MCs concentrations, implying the predominant effects of light limitations on the MCs content of Microcystis. Variables of greatest significance to the toxicity of Microcystis also included pH and dissolved inorganic nitrogen. However, total phosphorus was found to be a strong predictor of the biomass of total Microcystis and toxic M. aeruginosa. Together with the partial dependence plot, results revealed the positive correlations between protozoa and Microcystis biomass. In contrast, copepods biomass may regulate the MC quota and concentrations. Overall, our observations arouse universal demands for machine-learning strategies to represent nonlinear relationships between harmful algal blooms and environmental covariates.
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Li Y, Khan FH, Wu J, Zhang Y, Jiang Y, Chen X, Yao Y, Pan Y, Han X. Drivers of Spatiotemporal Eukaryote Plankton Distribution in a Trans-Basin Water Transfer Canal in China. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.899993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Planktonic eukaryotes are important components of aquatic ecosystems, and analyses of the whole eukaryotic planktonic community composition and function have far-reaching significance for water resource management. We aimed to understand the spatiotemporal variation and drivers of eukaryotic plankton distribution in the Middle Route Project of the South-to-North Water Diversion in Henan Province, China. Specifically, we examined planktonic assemblages and water quality at five stations along the canal and another one located before the dam in March, June, September, and December 2019. High-throughput sequencing revealed that the eukaryotic plankton community was primarily composed of 53 phyla, 200 genera, and 277 species, with Cryptophyta, Ciliophora, and norank_k_Cryptophyta being the dominant phyla. Redundancy analysis of the eukaryotic community and environmental factors showed that five vital factors affecting eukaryotic plankton distribution were oxidation-reduction potential, nitrate nitrogen, pH, total phosphorus, and water flow velocity. Furthermore, the geographical distribution of eukaryotic communities was consistent with the distance decay model. Importantly, environmental selection dominantly shaped the geographical distribution of the eukaryotic community. In summary, our study elucidates the ecological response of planktonic eukaryotes by identifying the diversity and ecological distribution of planktonic eukaryotes in trans-basin diversion channels.
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Gu P, Zhang G, Luo X, Xu L, Zhang W, Li Q, Sun Y, Zheng Z. Effects of different fluid fields on the formation of cyanobacterial blooms. CHEMOSPHERE 2021; 283:131219. [PMID: 34147980 DOI: 10.1016/j.chemosphere.2021.131219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 05/31/2021] [Accepted: 06/10/2021] [Indexed: 06/12/2023]
Abstract
Cyanobacterial blooms have been attracting more and more attention, and the mechanism is widely studied. However, the effects of fluid fields on the bloom formation were rarely reported. In this study, the effects of fluid fields formed under different external conditions were investigated. The results indicated that low wind speed (3 m/s) was conducive to the formation of cyanobacterial blooms, while high wind speed (6 m/s) was adverse. For low wind speed, an upward fluid field was detected by particle image velocimetry. This fluid field accelerated the algal growth by 58.6%, and improved the buoyancy by up-regulating the genes involved in the synthesis of gas vesicles and extracellular polymeric substances. In addition, the boundary shear stress induced the colony formation of cyanobacteria and improved the aggregation proportion significantly (p < 0.05), which was beneficial to bloom formation. As a result, cyanobacterial blooms are more likely to form on the lake shore under moderate breeze. When wind speed increased to 6 m/s, a downward fluid field was formed, causing algal cells to gather at the bottom and hindering the bloom formation. These results provided a theoretical basis for field researches related to the formation of cyanobacterial blooms and the treatment of cyanobacteria.
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Affiliation(s)
- Peng Gu
- Department of Environmental Science and Engineering, Fudan University, Shanghai, China
| | | | - Xin Luo
- Department of Environmental Science and Engineering, Fudan University, Shanghai, China
| | - Lianghao Xu
- China Ship Scientific Research Center, Wuxi, China
| | - Weizhen Zhang
- Department of Environmental Science and Engineering, Fudan University, Shanghai, China; School of Ecological Environment, Chengdu University of Technology, Chengdu, China.
| | - Qi Li
- Department of Environmental Science and Engineering, Fudan University, Shanghai, China
| | - Yuyang Sun
- Phillips Exeter Academy '20 graduate', Exeter, NH, USA
| | - Zheng Zheng
- Department of Environmental Science and Engineering, Fudan University, Shanghai, China.
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Zhao Q, Xu J, Wang J, Liu L. Temporal-spatial features and key factors' analysis of vertical eddy diffusivities in Taihu Lake, China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:45506-45518. [PMID: 33866486 DOI: 10.1007/s11356-021-13810-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 03/31/2021] [Indexed: 06/12/2023]
Abstract
Vertical eddy diffusivity (VED) is used to quantify the vertical mixing of water column, which has a profound influence on the evolution of aquatic ecosystems. Based on half-hourly water temperature measured at -20 cm and -150 cm depths from 2015 to 2017 at stations of Pingtaishan (PTS), Dapukou (DPK), Bifenggang (BFG), and Xiaoleishan (XLS) in Taihu Lake, the daily average VED is calculated according to the phase lag of water temperature series at two depths. The temporal and spatial features and possible evolution characters of vertical turbulences are then deliberated. The results show that the VED in Taihu Lake varies by several orders of magnitude. The weak VED exhibits stronger spatial heterogeneity and high frequency characteristics and vice versa for the strong VED. The VED in the center region of the lake is stronger, in comparison to bay areas. On seasonality, the VED is the strongest in winter, moderate in spring and autumn, and the weakest in summer. Analyses show that solar radiation and wind forcing are the key meteorological factors regulating VED changes, with the solar effect somewhat stronger than wind. It is also discussed potential roles of vertical mixing in cyanobacteria becoming dominant population in Taihu Lake.
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Affiliation(s)
- Qiaohua Zhao
- School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, 219 Ningliu Rd, Nanjing, 210044, China.
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, 219 Ningliu Rd, Nanjing, 210044, China.
| | - Jia Xu
- School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, 219 Ningliu Rd, Nanjing, 210044, China
| | - Jianjian Wang
- School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, 219 Ningliu Rd, Nanjing, 210044, China
| | - Ling Liu
- School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, 219 Ningliu Rd, Nanjing, 210044, China
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Zhu L, Shi W, Zhou J, Yu J, Kong L, Qin B. Strong turbulence accelerates sediment nitrification-denitrification for nitrogen loss in shallow lakes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 761:143210. [PMID: 33158538 DOI: 10.1016/j.scitotenv.2020.143210] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 10/17/2020] [Accepted: 10/18/2020] [Indexed: 06/11/2023]
Abstract
Due to energy dissipation, turbulent energy reaching bed sediment greatly differs in lakes with different depths, which potentially affects sediment denitrification and thereby nitrogen loss. In this study, we explored the impacts of turbulent energy reaching sediment on sediment nitrification rate using turbulence simulation experiments, and analyzed its role in determining sediment nitrogen loss in global lakes by investigating the relationship between denitrification rate with lake depth. Results demonstrated that sediment denitrification rate is affected by water depth in lakes with a depth of <~10 m, in which the rate was negatively correlated with lake depth, and maintained stably at low levels of <2.4 mg N m-2 day-1 in lakes with a depth of >~10 m. In shallow lakes, stronger turbulence reaching on sediment yielded higher nitrogen loss rate. Compare with the control, cumulated nitrogen loss from sediment increased by 10% at the turbulent velocity of 4.33 cm s-1 upon sediment. It is possibly because turbulence promoted faster transport of oxygen to surface sediment and enhanced the mineralization of buried organic matters to feed nitrification, which subsequently accelerated denitrification and thereby nitrogen loss. This study can add to our understanding of the role of lake morphology in nitrogen biogeochemical cycles.
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Affiliation(s)
- Lin Zhu
- Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies, Jiangsu Key Laboratory of Atmospheric Environmental Monitoring & Pollution Control, School of Environmental Science & Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Wenqing Shi
- Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies, Jiangsu Key Laboratory of Atmospheric Environmental Monitoring & Pollution Control, School of Environmental Science & Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Jian Zhou
- Taihu Lake Laboratory Ecosystem Station, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Jianghua Yu
- Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies, Jiangsu Key Laboratory of Atmospheric Environmental Monitoring & Pollution Control, School of Environmental Science & Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Lingwei Kong
- School of Engineering, Westlake University, Hangzhou 310024, China
| | - Boqiang Qin
- Taihu Lake Laboratory Ecosystem Station, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; School of Geography & Ocean Science, Nanjing University, Nanjing 210093, China.
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Peng L, Tang Q, Gu J, Lei L, Chen W, Song L. Seasonal variation of microcystins and their accumulation in fish in two large shallow lakes of China. ECOTOXICOLOGY (LONDON, ENGLAND) 2020; 29:790-800. [PMID: 32424447 DOI: 10.1007/s10646-020-02231-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/08/2020] [Indexed: 06/11/2023]
Abstract
Bioaccumulation of microcystins (MCs) has been widely observed in aquatic vertebrates and invertebrates, but its seasonal and specific variations remain unclear. In the present study, dissolved MCs in water, algal cell-bound MCs and muscle tissue MCs of nine fish species were investigated monthly in two of the largest shallow lakes in China: Lake Taihu and Lake Chaohu. The fish species were grouped as carnivorous, planktivorous, and omnivorous fish. Seasonal variations in dissolved and algal cell-bound MCs in water and MCs contents of fish hepatopancreas and muscle were investigated in the two lakes from 2009 to 2010. Dissolved MCs in water ranged from 0.35 to 2.56 µg l-1 in Lake Taihu and 0.16 to 2.45 µg l-1 in Lake Chaohu, and showed seasonally a unimodal distribution. Algal cell-bound MCs also showed a similar seasonal variation in both lakes, but dissolved MCs in water peaked about one month later than algal cell-bound MCs. The MCs content in the Fish muscle was higher MCs from October to December than in the other months. For most of the fish species, it exceeded the tolerable daily intake value established by the WHO. The averaged MCs content in the muscle of carnivorous, planktivorous, omnivorous fish was 48.2, 28.7 and 37.8 μg kg-1 in Lake Taihu, respectively, and 27.8, 18.6 and 20.4 μg kg-1 in Lake Chaohu. It was significantly higher in carnivorous fish than in planktivorous and omnivorous fish, indicating that carnivorous fish has a higher exposure risk to the local people when consuming the harvested fish. The average ratio of hepatopancreas to muscle MCs contents was 13.0, 25.2, 13.8 for carnivorous, planktivorous, omnivorous fishes in Lake Taihu, respectively, and 18.0, 24.9, 14.8 in Lake Chaohu. These ratio for planktivorous fish almost doubled that for carnivorous and omnivorous fish. High correlation of MC content in carnivorous, omnivorous and planktivorous fish indicates that MCs can be delivered along trophic levels in the food chains.
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Affiliation(s)
- Liang Peng
- Institute of Hydrobiology, Jinan University, 510632, Guangzhou, PR China
| | - Quehui Tang
- Institute of Hydrobiology, Jinan University, 510632, Guangzhou, PR China
| | - Jiguang Gu
- Institute of Hydrobiology, Jinan University, 510632, Guangzhou, PR China
| | - Lamei Lei
- Institute of Hydrobiology, Jinan University, 510632, Guangzhou, PR China.
| | - Wei Chen
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, PR China
| | - Lirong Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, PR China.
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An M, Yang S, Wu H, Luo G, Li M. Recommended turbulent energy dissipation rate for biomass and lipid production of Scenedesmus obliquus in an aerated photosynthetic culture system. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:26473-26483. [PMID: 32367240 DOI: 10.1007/s11356-020-08700-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Accepted: 03/31/2020] [Indexed: 06/11/2023]
Abstract
Effects of turbulent energy dissipation rate (increased from 1.28 × 10-6 to 1.67 × 10-5 m2 s-3) on Scenedesmus obliquus biomass and lipid accumulation at different aeration rates (0.3, 0.6, 0.9, 1.2, and 1.5 L min-1) were investigated. The turbulent energy dissipation rate was calculated by CFD model simulation. When the turbulent energy dissipation rate increased to 7.30 × 10-6 m2 s-3, the biomass and lipid productivity increased gradually, and finally reached their maximum values of 1.11 × 107 cells mL-1 and 16.0 mg L-1 day-1, respectively. When it exceeded 7.30 × 10-6 m2 s-3, the biomass and lipid productivity showed a decreasing trend. Therefore, the most favorable turbulent energy dissipation rate for S. obliquus growth and lipid accumulation was 7.30 × 10-6 m2 s-3.
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Affiliation(s)
- Mei An
- Gansu Microalgae Technology Innovation Center, Key laboratory of Hexi Corridor Resources Utilization of Gansu, Hexi University, Zhangye, Gansu, 734000, People's Republic of China
- College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling, 712100, People's Republic of China
| | - Songqi Yang
- Gansu Microalgae Technology Innovation Center, Key laboratory of Hexi Corridor Resources Utilization of Gansu, Hexi University, Zhangye, Gansu, 734000, People's Republic of China
| | - Haiming Wu
- College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling, 712100, People's Republic of China
| | - Guanghong Luo
- Gansu Microalgae Technology Innovation Center, Key laboratory of Hexi Corridor Resources Utilization of Gansu, Hexi University, Zhangye, Gansu, 734000, People's Republic of China.
| | - Ming Li
- College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Yangling, 712100, People's Republic of China.
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Ren G, He X, Wu P, He Y, Zhang Y, Tang S, Song X, He Y, Wei Y, Ding P, Yang F. Biodegradation of microcystin-RR and nutrient pollutants using Sphingopyxis sp. YF1 immobilized activated carbon fibers-sodium alginate. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:10811-10821. [PMID: 31942719 DOI: 10.1007/s11356-020-07640-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 01/07/2020] [Indexed: 06/10/2023]
Abstract
A novel biological material named activated carbon fibers-sodium alginate@Sphingopyxis sp. YF1 (ACF-SA@YF1) was synthesized for microcystin-RR (MC-RR) and nutrient pollutant degradation in eutrophic water. The synthesized biomaterial was characterized by scanning electron microscopy (SEM). Box-Behnken design and response surface methodology (RSM) were utilized for the optimization of conditions during the MC-RR degradation. The degradation of MC-RR and nutrient pollutants was dynamically detected. The results revealed that the optimal conditions were temperature 32.51 °C, pH 6.860, and inoculum 14.97%. The removal efficiency of MC-RR, nitrogen, phosphorus, and chemical oxygen demand were 0.76 μg/mL/h, 32.45%, 94.57%, and 64.07%, respectively. In addition, ACF-SA@YF1 also performed satisfactory cyclic stability, while the MC-RR removal efficiency was 70.38% after seven cycles and 78.54% of initial activity after 20 days of storage. Therefore, it is reasonable to believe that ACF-SA@YF1 is an effective material which has a great prospect in removing MC-RR and nutrients from freshwater ecosystems.
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Affiliation(s)
- Guofeng Ren
- Xiangya School of Public Health, Central South University, Changsha, 410078, Hunan, China
| | - Xinghou He
- Xiangya School of Public Health, Central South University, Changsha, 410078, Hunan, China
| | - Pian Wu
- Xiangya School of Public Health, Central South University, Changsha, 410078, Hunan, China
| | - Yayuan He
- Xiangya School of Public Health, Central South University, Changsha, 410078, Hunan, China
| | - Yong Zhang
- Xiangya School of Public Health, Central South University, Changsha, 410078, Hunan, China
| | - Shibiao Tang
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, Hunan, China
| | - Xinli Song
- Xiangya School of Public Health, Central South University, Changsha, 410078, Hunan, China
| | - Yafei He
- Xiangya School of Public Health, Central South University, Changsha, 410078, Hunan, China
| | - Yuandan Wei
- Xiangya School of Public Health, Central South University, Changsha, 410078, Hunan, China
| | - Ping Ding
- Xiangya School of Public Health, Central South University, Changsha, 410078, Hunan, China.
| | - Fei Yang
- Xiangya School of Public Health, Central South University, Changsha, 410078, Hunan, China.
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Zhao G, Gao X, Zhang C, Sang G. The effects of turbulence on phytoplankton and implications for energy transfer with an integrated water quality-ecosystem model in a shallow lake. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 256:109954. [PMID: 31822459 DOI: 10.1016/j.jenvman.2019.109954] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 11/30/2019] [Accepted: 11/30/2019] [Indexed: 06/10/2023]
Abstract
Turbulence has significant influences on the growth rate and community structure of phytoplankton in large shallow lakes. Phytoplankton in moving water may be influenced by turbulence and nutrient concentration gradients on a short time scale. To assess this issue, our research used an ensemble water quality and ecological model by internally coupling the three-dimensional hydrodynamic model, the Environmental Fluid Dynamics Code (EFDC), and the one-dimensional ecosystem model, PCLake. The results showed that turbulence dramatically inhibited phytoplankton growth, while nutrients had the opposite effect. In addition, turbulence was the key factor contributing to phytoplankton growth. However, the effects of turbulence on phytoplankton correlated with nutrient concentrations. For lower nutrient concentrations, phytoplankton growth was controlled by nutrients. Logistic regression models were established with the modeled chlorophyll a, total nitrogen (TN), total phosphorus (TP) and turbulent kinetic energy (Ke). The results also showed that turbulence could improve nutrient uptake by phytoplankton, especially at low nutrient levels. The effects of turbulence on phytoplankton may imply that energy transfer occurs between water turbulence and phytoplankton. Our study will provide insight into management and remediation strategies of ecosystems based on energy processes in the future.
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Affiliation(s)
- Guixia Zhao
- State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China.
| | - Xueping Gao
- State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China.
| | - Chen Zhang
- State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China.
| | - Guoqing Sang
- School of Water Conservancy and Environment, University of Jinan, Jina, China
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An Improved Logistic Model Illustrating Microcystis aeruginosa Growth Under Different Turbulent Mixing Conditions. WATER 2019. [DOI: 10.3390/w11040669] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
To overcome the limitations of the normal logistic equation, we aimed to improve the logistic model under hydrodynamic conditions for the examination of the responses of cyanobacterium, coupled turbulence mixing, and growth of cyanobacterium in population dynamics models. Selecting Microcystis aeruginosa and experimenting with the ideal conditions in a laboratory beaker, the chlorophyll-a concentration reached the corresponding maximum under each turbulent condition compared with the control. According to the experiment results, the theory of mass transfer, turbulence mixing, and the logistic equation are organically combined. The improved logistic growth model of Microcystis aeruginosa and competition growth model in the symbiont Scenedesmus quadricauda under turbulent conditions were established. Using the MATLAB multi-parameter surface fitting device, both models produced good fitting effects, with R > 0.95, proving that the results fit the models, and demonstrating the relationship of the unity of nutrient transfer and algae growth affected by turbulence mixing. With continuous increases in turbulent mixing, the fitted curve became smoother and steadier. Algae stimulated by turbulence accelerate reproduction and fission to achieve population dominance. The improved logistic model quantitatively explains the Microcystis aeruginosa response to turbulence and provides a basis to represent ecological and biogeochemical processes in enclosed eutrophic water bodies.
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13
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Gao Y, Yu J, Song Y, Zhu G, Paerl HW, Qin B. Spatial and temporal distribution characteristics of different forms of inorganic nitrogen in three types of rivers around Lake Taihu, China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:6898-6910. [PMID: 30635880 DOI: 10.1007/s11356-019-04154-w] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Accepted: 01/02/2019] [Indexed: 06/09/2023]
Abstract
In order to control nitrogen (N) pollution of Lake Taihu, China, we studied the spatial and temporal distribution characteristics of inorganic N in inflowing rivers polluted by industry, agriculture, and domestic sewage during low, moderate, and high flow periods. The results showed that dissolved total nitrogen (DTN) was the main fraction of total nitrogen (TN) input from these rivers. Inflowing rivers had distinct impacts on TN, DTN, ammonium N (NH4+), and nitrate N (NO3-) concentrations of Lake Taihu during the low flow period. Particulate nitrogen (PN) had an impact on Lake Taihu during the three flow periods and all the three types of rivers would increase PN concentration in the lake. Rivers polluted by agriculture had the greatest impact on Lake Taihu's TN, DTN, NO3-, and dissolved inorganic N (DIN) concentrations, while rivers polluted by industry had the greatest impact on NH4+ concentration. Therefore, agriculture and industry should be key targets for nutrient reductions. The in-lake N concentrations were higher than those of inflowing rivers during moderate and high flow periods.
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Affiliation(s)
- Yongxia Gao
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing, 210044, China.
| | - Jianghua Yu
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing, 210044, China
| | - Yuzhi Song
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing, 210044, China
| | - Guangwei Zhu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, China
| | - Hans W Paerl
- Institute of Marine Sciences, University of North Carolina at Chapel Hill, 3431 Arendell Street, Morehead City, NC, 28557, USA
| | - Boqiang Qin
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, China
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14
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Sun LW, Jiang WJ, Zhang JY, Wang WQ, Du Y, Sato H, Kawachi M, Yu R. Identification and detection sensitivity of Microcystis aeruginosa from mixed and field samples using MALDI-TOF MS. ENVIRONMENTAL MONITORING AND ASSESSMENT 2018; 190:712. [PMID: 30415457 DOI: 10.1007/s10661-018-7093-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 10/30/2018] [Indexed: 06/09/2023]
Abstract
To verify the applicability of identifying Microcystis aeruginosa by matrix-assisted laser desorption-ionization-time-of-flight mass spectrometry (MALDI-TOF MS), mixed and field samples were employed to study the sensitivity and the analysis power, respectively. Series diluted samples and artificially mixed samples by the M. aeruginosa NIES-843 strain were designed to verify the sensitivity. The lowest detection limit was 1.955 × 106 cells in pure samples, while for mixed samples, the lowest detection limit and ratio of NIES-843 strain were 2.88 × 106 cells and 33.7%, respectively. The results provided a reference for the reasonable volume of the water sample in which the M. aeruginosa could be detected. Ribosomal protein biomarkers for identifying M. aeruginosa which were successfully detected from the field samples in Taihu Lake, indicated that the identification of M. aeruginosa by MALDI-TOF MS could be applied in field samples. Furthermore, different genetic types of M. aeruginosa strains were also detected at different locations in Taihu Lake, which revealed the diversity of M. aeruginosa and the detection power of MALDI-TOF MS at the strain level for the field samples. The sensitivity and detection power in the analysis of M. aeruginosa by the MALDI-TOF MS demonstrated the applicability of this method in routine environmental monitoring.
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Affiliation(s)
- Li-Wei Sun
- School of Energy & Environment, Southeast University, Nanjing, Jiangsu, China.
- Taihu Lake Water Environment Engineering Research Center (Wuxi), Southeast University, Wuxi, Jiangsu, China.
| | - Wen-Jing Jiang
- School of Energy & Environment, Southeast University, Nanjing, Jiangsu, China
- Taihu Lake Water Environment Engineering Research Center (Wuxi), Southeast University, Wuxi, Jiangsu, China
| | - Jun-Yi Zhang
- Wuxi Environmental Monitoring Center, Wuxi, Jiangsu, China
| | - Wen-Qian Wang
- School of Energy & Environment, Southeast University, Nanjing, Jiangsu, China
- Taihu Lake Water Environment Engineering Research Center (Wuxi), Southeast University, Wuxi, Jiangsu, China
| | - Yang Du
- School of Energy & Environment, Southeast University, Nanjing, Jiangsu, China
- Taihu Lake Water Environment Engineering Research Center (Wuxi), Southeast University, Wuxi, Jiangsu, China
| | - Hiroaki Sato
- Polymer Chemistry Group, Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
| | - Masanobu Kawachi
- Biodiversity Resource Conservation Section, Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Ran Yu
- School of Energy & Environment, Southeast University, Nanjing, Jiangsu, China.
- Taihu Lake Water Environment Engineering Research Center (Wuxi), Southeast University, Wuxi, Jiangsu, China.
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15
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Li M, Xiao M, Zhang P, Hamilton DP. Morphospecies-dependent disaggregation of colonies of the cyanobacterium Microcystis under high turbulent mixing. WATER RESEARCH 2018; 141:340-348. [PMID: 29804020 DOI: 10.1016/j.watres.2018.05.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 05/08/2018] [Accepted: 05/10/2018] [Indexed: 06/08/2023]
Abstract
Preventing formation of large colonies and reducing colony size of the cyanobacterium Microcystis may lead to reductions in bloom formation. Here we investigated the effects of artificial mixing on morphology and disaggregation dynamics of Microcystis colonies in vivo, using a stirring device and a laser particle analyzer. The turbulent dissipation rate (ε) was varied from 0.020 to 0.364 m2 s-3. We hypothesized that colonies of M. aeruginosa and M. ichthyoblabe would be more susceptible to disaggregation from turbulent mixing than colonies of M. wesenbergii. Our results showed that colony size of M. aeruginosa and M. ichthyoblabe decreased with increased turbulence intensity and duration of stirring for ε > 0.094 m2 s-3, while M. wesenbergii showed less obvious changes in colony size with mixing. Spherical M. wesenbergii colonies exposed to high turbulence intensities for 30 min gradually transitioned to colony morphologies similar to M. ichthyoblabe and M. aeruginosa-like colonies (irregular, elongated or lobed, with distinct holes). Our results suggest that turbulent mixing is an important factor driving morphological changes of Microcystis colonies, and artificial mixing may effectively reduce colony size of Microcystis, thereby preventing bloom formation.
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Affiliation(s)
- Ming Li
- College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, PR China; Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project, Nanyang Normal University, Nanyang, 473061, PR China.
| | - Man Xiao
- Australian Rivers Institute, Griffith University, Nathan, QLD 4111, Australia; School of Environment, Griffith University, Nathan, QLD 4111, Australia
| | - Pei Zhang
- State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, PR China; School of Civil Engineering, University of Queensland, St Lucia, QLD 4072, Australia
| | - David P Hamilton
- Australian Rivers Institute, Griffith University, Nathan, QLD 4111, Australia
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16
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Zhu L, Qin B, Zhou J, Van Dam B, Shi W. Effects of turbulence on carbon emission in shallow lakes. J Environ Sci (China) 2018; 69:166-172. [PMID: 29941252 DOI: 10.1016/j.jes.2017.10.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 10/11/2017] [Accepted: 10/12/2017] [Indexed: 06/08/2023]
Abstract
Turbulent mixing is enhanced in shallow lakes. As a result, exchanges across the air-water and sediment-water interfaces are increased, causing these systems to be large sources of greenhouse gases. This study investigated the effects of turbulence on carbon dioxide (CO2) and methane (CH4) emissions in shallow lakes using simulated mesocosm experiments. Results demonstrated that turbulence increased CO2 emissions, while simultaneously decreasing CH4 emissions by altering microbial processes. Under turbulent conditions, a greater fraction of organic carbon was recycled as CO2 instead of CH4, potentially reducing the net global warming effect because of the lower global warming potential of CO2 relative to CH4. The CH4/CO2 flux ratio was approximately 0.006 under turbulent conditions, but reached 0.078 in the control. The real-time quantitative PCR analysis indicated that methanogen abundance decreased and methanotroph abundance increased under turbulent conditions, inhibiting CH4 production and favoring the oxidation of CH4 to CO2. These findings suggest that turbulence may play an important role in the global carbon cycle by limiting CH4 emissions, thereby reducing the net global warming effect of shallow lakes.
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Affiliation(s)
- Lin Zhu
- Taihu Lake Laboratory Ecosystem Station, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, East Beijing Road 73, Nanjing 210008, China.
| | - Boqiang Qin
- Taihu Lake Laboratory Ecosystem Station, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, East Beijing Road 73, Nanjing 210008, China.
| | - Jian Zhou
- Taihu Lake Laboratory Ecosystem Station, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, East Beijing Road 73, Nanjing 210008, China
| | - Bryce Van Dam
- Institute of Marine Sciences, University of North Carolina at Chapel Hill, Morehead City, NC, USA
| | - Wenqing Shi
- Center for Eco-Environmental Research, Nanjing Hydraulics Research Institute, Guangzhoulu 223, Nanjing 210029, China
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17
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Dynamics of phosphorus and bacterial phoX genes during the decomposition of Microcystis blooms in a mesocosm. PLoS One 2018; 13:e0195205. [PMID: 29723219 PMCID: PMC5933731 DOI: 10.1371/journal.pone.0195205] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 03/19/2018] [Indexed: 11/20/2022] Open
Abstract
Cyanobacterial blooms are a worldwide environmental problem and frequently occur in eutrophic lakes. Organophosphorus mineralization regulated by microbial alkaline phosphatase provides available nutrients for bloom regeneration. To uncover the dynamics of bacterial alkaline phosphatase activity and microbial backgrounds in relation to organophosphorus mineralization during the decomposition process of cyanobacterial blooms, the response of alkaline phosphatase PhoX-producing bacteria were explored using a 23-day mesocosm experiment with three varying densities of Microcystis biomass from eutrophic Lake Taihu. Our study found large amounts of soluble reactive phosphorus and dissolved organophosphorus were released into the lake water during the decomposition process. Bacterial alkaline phosphatase activity showed the peak values during days 5~7 in groups with different chlorophyll-a densities, and then all decreased dramatically to their initial experimental levels during the last stage of decomposition. Bacterial phoX abundances in the three experimental groups increased significantly along with the decomposition process, positively related to the dissolved organic carbon and organophosphorus released by the Microcystis blooms. The genotypes similar to the phoX genes of Alphaproteobacteria were dominant in all groups, whereas the genotypes most similar to the phoX genes of Betaproteobacteria and Cyanobacteria were also abundant in the low density (~15 μg L-1 chlorophyll-a) group. At the end of the decomposition process, the number of genotypes most similar to the phoX of Betaproteobacteria and Cyanobacteria increased in the medium (~150 μg L-1 chlorophyll-a) and high (~1500 μg L-1 chlorophyll-a) density groups. The released organophosphorus and increased bacterial phoX abundance after decomposition of Microcystis aggregates could potentially provide sufficient nutrients and biological conditions for algal proliferation and are probably related to the regeneration of Microcystis blooms in eutrophic lakes.
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18
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He Q, Kang L, Sun X, Jia R, Zhang Y, Ma J, Li H, Ai H. Spatiotemporal distribution and potential risk assessment of microcystins in the Yulin River, a tributary of the Three Gorges Reservoir, China. JOURNAL OF HAZARDOUS MATERIALS 2018; 347:184-195. [PMID: 29306814 DOI: 10.1016/j.jhazmat.2018.01.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 12/29/2017] [Accepted: 01/01/2018] [Indexed: 06/07/2023]
Abstract
Microcystins (MCs) pose potential threat for both aquatic organisms and humans, whereas their occurrence in response to hydrodynamic alterations are not clearly understood. Here, spatiotemporal variations of dissolved MC-RR and MC-LR were evaluated monthly in 2016 in the Yulin River, a tributary of the Three Gorges Reservoir (TGR). The environmental factors that linked to MCs concentration were discussed. The results revealed that MC-RR maximumly reached 3.55 μg/L, and the maximum MC-LR concentration exceeded the threshold value of 1.0 μg/L recommended by the WHO. MCs concentrations were higher during the flood season and decreased from the estuary to the upstream reach of the Yulin River. Ecological risk assessment confirmed that MC-LR had significant adverse effects on the benthonic invertebrates Potamopyrgus antipodarum. MCs content in the sediment was 1.70- to 20-fold higher than that in suspended particulate matter (SPM). The impacts of environmental factors on the MCs profile differed between flood and dry seasons and the longitudinal differences of MCs were determined by the longitudinal profile of water velocity and SPM content, which were affected by TGR operations. This study suggested that the occurrence of MCs in the Yulin River were influenced by hydrologic regime in TGR.
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Affiliation(s)
- Qiang He
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing, 400044, China
| | - Li Kang
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing, 400044, China
| | - Xingfu Sun
- Chongqing Green Environment Protection Technology Co., Ltd., Chongqing, 400044, China
| | - Ruxue Jia
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing, 400044, China
| | - Ying Zhang
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing, 400044, China
| | - Jiangsen Ma
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing, 400044, China
| | - Hong Li
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing, 400044, China.
| | - Hainan Ai
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing, 400044, China.
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19
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Zhang L, Liu J, Zhang D, Luo L, Liao Q, Yuan L, Wu N. Seasonal and spatial variations of microcystins in Poyang Lake, the largest freshwater lake in China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:6300-6307. [PMID: 29247414 DOI: 10.1007/s11356-017-0967-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 12/06/2017] [Indexed: 06/07/2023]
Abstract
Poyang Lake is the largest freshwater lake in China and an important drinking water source. Since the year 2000, toxic cyanobacteria have been observed frequently in Poyang Lake. In the present study, spatial and seasonal variations of microcystins (MCs; MC-RR, MC-YR, and MC-LR) in water column were examined monthly from January to December (except the months of March, May, and November) in 2013, by using ultra-high-performance liquid chromatography-electrospray ionization tandem triple quadrupole/mass spectrometry (UPLC-MS/MS). MC-RR was the most dominant variant, followed by MC-LR, while MC-YR was detected in low concentration. Total MC concentrations (intracellular + extracellular MCs) ranged from 1.26 to 9916.05 ng/L, with an average of 469.99 ng/L, and only 3.14% (6 out of 192 samples) of the water samples contained MC concentrations that exceeded the drinking water guideline level of 1 μg/L for MC-LR proposed by the World Health Organization (WHO). MC concentrations in water column showed obvious seasonal variations in Poyang Lake. Intracellular and extracellular MCs were both at a low level from January to April but increased quickly from June to August and decreased dramatically thereafter. Intracellular MCs exhibited similar spatial distribution pattern with extracellular MCs. Both intracellular and extracellular MC concentrations in eastern bays and around Songmen Mountain of Poyang Lake were higher than other regions. Intracellular MC concentrations were positively correlated with Chl a (r = 046, P < 0.01), pH (r = 0.25, P < 0.01), cyanobacterial biomass (r = 0.40, P < 0.01), and temperature (r = 0.36, P < 0.01) but negatively correlated with TN (r = - 0.28, P < 0.01), suggesting that TN, cyanobacteria biomass, pH, and temperature might be regulating factors for MC production in Poyang Lake.
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Affiliation(s)
- Li Zhang
- Institute for Quality and Safety and Standards of Agricultural Products Research, Jiangxi Academy of Agricultural Sciences, Nanlian Road 602, Nanchang, 330200, Jiangxi, People's Republic of China
| | - Jutao Liu
- Jiangxi Provincial Institute of Water Sciences, Nanchang, Jiangxi, 330200, China
| | - Dawen Zhang
- Institute for Quality and Safety and Standards of Agricultural Products Research, Jiangxi Academy of Agricultural Sciences, Nanlian Road 602, Nanchang, 330200, Jiangxi, People's Republic of China.
| | - Linguang Luo
- Institute for Quality and Safety and Standards of Agricultural Products Research, Jiangxi Academy of Agricultural Sciences, Nanlian Road 602, Nanchang, 330200, Jiangxi, People's Republic of China
| | - Qiegen Liao
- Institute for Quality and Safety and Standards of Agricultural Products Research, Jiangxi Academy of Agricultural Sciences, Nanlian Road 602, Nanchang, 330200, Jiangxi, People's Republic of China
| | - Lijuan Yuan
- Institute for Quality and Safety and Standards of Agricultural Products Research, Jiangxi Academy of Agricultural Sciences, Nanlian Road 602, Nanchang, 330200, Jiangxi, People's Republic of China
| | - Naicheng Wu
- Aarhus Institute of Advanced Studies, Aarhus University, Høegh-Guldbergs Gade 6B, 8000, Aarhus C, Denmark
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20
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Dell'Aquila G, Ferrante MI, Gherardi M, Cosentino Lagomarsino M, Ribera d'Alcalà M, Iudicone D, Amato A. Nutrient consumption and chain tuning in diatoms exposed to storm-like turbulence. Sci Rep 2017; 7:1828. [PMID: 28500335 PMCID: PMC5431809 DOI: 10.1038/s41598-017-02084-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 04/07/2017] [Indexed: 11/09/2022] Open
Abstract
Current information on the response of phytoplankton to turbulence is linked to cell size and nutrient availability. Diatoms are considered to be favored by mixing as dissolved nutrients are more easily accessible for non-motile cells. We investigated how diatoms exploit microscale turbulence under nutrient repletion and depletion conditions. Here, we show that the chain-forming diatom Chaetoceros decipiens, continues to take up phosphorus and carbon even when silicon is depleted during turbulence. Our findings indicate that upon silica depletion, during turbulence, chain spectra of C. decipiens remained unchanged. We show here that longer chains are maintained during turbulence upon silica depletion whereas under still conditions, shorter chains are enriched. We interpret this as a sign of good physiological state leading to a delay of culture senescence. Our results show that C. decipiens senses and responds to turbulence both in nutrient repletion and depletion. This response is noteworthy due to the small size of the species. The coupling between turbulence and biological response that we depict here may have significant ecological implications. Considering the predicted increase of storms in Northern latitudes this response might modify community structure and succession. Our results partly corroborate Margalef's mandala and provide additional explanations for that conceptualization.
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Affiliation(s)
- Gianluca Dell'Aquila
- Stazione Zoologica Anton Dohrn, Department of Integrative Marine Ecology, Villa Comunale, 80121, Naples, Italy.,Zellbiologie Philipps-Universität Marburg, Karl-von-Frisch Str., 8 35043, Marburg, Germany
| | - Maria I Ferrante
- Stazione Zoologica Anton Dohrn, Department of Integrative Marine Ecology, Villa Comunale, 80121, Naples, Italy
| | - Marco Gherardi
- Dipartimento di Fisica, Università di Milano, Via Celoria 16, 20133, Milan, Italy.,UMR 7238 CNRS Computational and Quantitative Biology, University Pierre et Marie Curie, 15, rue de l'Ecole de Médecine, 75006, Paris, France
| | - Marco Cosentino Lagomarsino
- UMR 7238 CNRS Computational and Quantitative Biology, University Pierre et Marie Curie, 15, rue de l'Ecole de Médecine, 75006, Paris, France
| | - Maurizio Ribera d'Alcalà
- Stazione Zoologica Anton Dohrn, Department of Integrative Marine Ecology, Villa Comunale, 80121, Naples, Italy
| | - Daniele Iudicone
- Stazione Zoologica Anton Dohrn, Department of Integrative Marine Ecology, Villa Comunale, 80121, Naples, Italy.
| | - Alberto Amato
- Stazione Zoologica Anton Dohrn, Department of Integrative Marine Ecology, Villa Comunale, 80121, Naples, Italy. .,Laboratoire de Physiologie Cellulaire et Végétale, UMR5168 CNRS-CEA-INRA-Université de Grenoble Alpes, Institut de Recherche en Science et Technologies pour le Vivant, CEA Grenoble, 17 rue des Martyrs, 38054, Grenoble Cédex 9, France.
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21
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Yang J, Gao H, Glibert PM, Wang Y, Tong M. Rates of nitrogen uptake by cyanobacterially-dominated assemblages in Lake Taihu, China, during late summer. HARMFUL ALGAE 2017; 65:71-84. [PMID: 28526121 DOI: 10.1016/j.hal.2017.04.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 03/22/2017] [Accepted: 04/04/2017] [Indexed: 06/07/2023]
Abstract
Lake Taihu has suffered an increasing number of cyanobacteria harmful algal blooms (CyanoHABs) over the past three decades, bringing about formidable ecological and economical losses. Efforts to control phosphate (P) and/or nitrogen (N) have been applied to mitigate these blooms, but there has been much less attention paid to N and its different forms on the ecology of the blooms. Therefore, kinetic and nutrient enrichment experiments were conducted to assess N uptake rates under differing conditions, and to examine effects of changes in N forms (NH4+, NO3- and urea) and P availability on phytoplankton community physiology. In 2014 these experiments involved mesocosm enrichments; in 2015 these experiments were conducted over a diurnal period. Both involved measurements of short-term N uptake. The kinetic results showed that the utilization of NH4+, NO3- and urea by Microcystis-dominated communities was not efficient at low ambient substrate concentrations. Maximum uptake rates by these phytoplankton was achieved on NH4+ and these rates were significantly higher than those on NO3- or urea with or without nutrient pretreatment. Moreover in the presence of PO43- enrichment, the maximal uptake velocity of NH4+ substantially increased without evidence of saturation. High amounts of NH4+ may have inhibited or repressed the uptake of NO3- at certain times in these studies. In the diurnal study, dissolved inorganic carbon and pH changed substantially throughout the day. The resulting high pH altered N and P in ways that may help to sustain nutrient cycling for the blooms.
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Affiliation(s)
- Jingjing Yang
- Ocean College, Zhejiang University, Zhoushan, 316021, China
| | - Han Gao
- Ocean College, Zhejiang University, Zhoushan, 316021, China
| | - Patricia M Glibert
- Ocean College, Zhejiang University, Zhoushan, 316021, China; University of Maryland Center for Environment Science, Horn Point Laboratory, Cambridge, MD, 21613, USA
| | - Yu Wang
- Ocean College, Zhejiang University, Zhoushan, 316021, China
| | - Mengmeng Tong
- Ocean College, Zhejiang University, Zhoushan, 316021, China; Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanographic Administration, Hangzhou, 310012, China.
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22
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Li H, Ai H, Kang L, Sun X, He Q. Simultaneous Microcystis Algicidal and Microcystin Degrading Capability by a Single Acinetobacter Bacterial Strain. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:11903-11911. [PMID: 27712061 DOI: 10.1021/acs.est.6b03986] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Measures for removal of toxic harmful algal blooms often cause lysis of algal cells and release of microcystins (MCs). In this study, Acinetobacter sp. CMDB-2 that exhibits distinct algal lysing activity and MCs degradation capability was isolated. The physiological response and morphological characteristics of toxin-producing Microcystis aeruginosa, the dynamics of intra- and extracellular MC-LR concentration were studied in an algal/bacterial cocultured system. The results demonstrated that Acinetobacter sp. CMDB-2 caused thorough decomposition of algal cells and impairment of photosynthesis within 24 h. Enhanced algal lysis and MC-LR release appeared with increasing bacterial density from 1 × 103 to 1 × 107 cells/mL; however, the MC-LR was reduced by nearly 94% within 14 h irrespective of bacterial density. Measurement of extracellular and intracellular MC-LR revealed that the toxin was decreased by 92% in bacterial cell incubated systems relative to control and bacterial cell-free filtrate systems. The results confirmed that the bacterial metabolite caused 92% lysis of Microcystis aeruginosa cells, whereas the bacterial cells were responsible for approximately 91% reduction of MC-LR. The joint efforts of the bacterium and its metabolite accomplished the sustainable removal of algae and MC-LR. This is the first report of a single bacterial strain that achieves these dual actions.
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Affiliation(s)
- Hong Li
- Key Laboratory of Eco-Environment of Three Gorges Region of Ministry of Education, Chongqing University , Chongqing 400044, China
| | - Hainan Ai
- Key Laboratory of Eco-Environment of Three Gorges Region of Ministry of Education, Chongqing University , Chongqing 400044, China
| | - Li Kang
- Key Laboratory of Eco-Environment of Three Gorges Region of Ministry of Education, Chongqing University , Chongqing 400044, China
| | - Xingfu Sun
- Xiamen Municipal Engineering Design Institute CO., LTD, Chongqing 401122, China
| | - Qiang He
- Key Laboratory of Eco-Environment of Three Gorges Region of Ministry of Education, Chongqing University , Chongqing 400044, China
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