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Drobac Backović D, Tokodi N. Blue revolution turning green? A global concern of cyanobacteria and cyanotoxins in freshwater aquaculture: A literature review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 360:121115. [PMID: 38749125 DOI: 10.1016/j.jenvman.2024.121115] [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: 02/27/2024] [Revised: 04/25/2024] [Accepted: 05/06/2024] [Indexed: 06/05/2024]
Abstract
To enhance productivity, aquaculture is intensifying, with high-density fish ponds and increased feed input, contributing to nutrient load and eutrophication. Climate change further exacerbates cyanobacterial blooms and cyanotoxin production that affect aquatic organisms and consumers. A review was conducted to outline this issue from its inception - eutrophication, cyanobacterial blooms, their harmful metabolites and consequential effects (health and economic) in aquacultures. The strength of evidence regarding the relationship between cyanobacteria/cyanotoxins and potential consequences in freshwater aquacultures (fish production) globally were assessed as well, while identifying knowledge gaps and suggesting future research directions. With that aim several online databases were searched through June 2023 (from 2000), and accessible publications conducted in aquacultures with organisms for human consumption, reflecting cyanotoxin exposure, were selected. Data on cyanobacteria/cyanotoxins in aquacultures and its products worldwide were extracted and analyzed. Selected 63 papers from 22 countries were conducted in Asia (48%), Africa (22%), America (22%) and Europe (8%). Microcystis aeruginosa was most frequent, among over 150 cyanobacterial species. Cyanobacterial metabolites (mostly microcystins) were found in aquaculture water and fish from 18 countries (42 and 33 papers respectively). The most affected were small and shallow fish ponds, and omnivorous or carnivorous fish species. Cyanotoxins were detected in various fish organs, including muscles, with levels exceeding the tolerable daily intake in 60% of the studies. The majority of research was done in developing countries, employing less precise detection methods, making the obtained values estimates. To assess the risk of human exposure, the precise levels of all cyanotoxins, not just microcystins are needed, including monitoring their fate in aquatic food chains and during food processing. Epidemiological research on health consequences, setting guideline values, and continuous monitoring are necessary as well. Further efforts should focus on methods for elimination, prevention, and education.
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Affiliation(s)
- Damjana Drobac Backović
- University of Novi Sad, Faculty of Sciences, Department of Biology and Ecology, Trg Dositeja Obradovića 3, Novi Sad, 21000, Serbia
| | - Nada Tokodi
- University of Novi Sad, Faculty of Sciences, Department of Biology and Ecology, Trg Dositeja Obradovića 3, Novi Sad, 21000, Serbia; Jagiellonian University, Faculty of Biochemistry, Biophysics and Biotechnology, Laboratory of Metabolomics, Gronostajowa 7, Krakow, 30387, Poland.
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2
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Le TH, Nguyen TNQ, Tran TXP, Nguyen HQ, Truong NCQ, Le TL, Pham VH, Pham TL, Tran THY, Tran TT. Identifying the impact of land use land cover change on streamflow and nitrate load following modeling approach: a case study in the upstream Dong Nai River basin, Vietnam. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:68563-68576. [PMID: 37121945 DOI: 10.1007/s11356-023-26887-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 04/04/2023] [Indexed: 05/27/2023]
Abstract
Tri An Reservoir is a vital source of water for agriculture, industry, hydropower, and public usage in Southern Vietnam. Due to human activities, water eutrophication has become a serious problem in recent decades. This study investigated for the first time the impact of land use and land cover (LULC) change on streamflow and nitrate load from the upstream Dong Nai River basin, which is the largest watershed of the reservoir. The study utilized several LULC scenarios, including LULC 2000, 2010, and 2020. The SWAT model was applied to model the watershed during the period 1997-2009. Results showed that the hydrological model performed satisfactorily based on the Nash-Sutcliffe efficiency (NSE) coefficient, the root mean square error observations standard deviation ratio (RSR), and the percent bias (PBIAS). The average simulated values of monthly streamflow and nitrate load were 453.7, 450.0, 446.7 m3/s and 17,699.43, 17,869.13, 17,590.81 tonnes for the LULC 2000, 2010, and 2020 scenarios, respectively. There were no significant differences in streamflow and nitrate load at the basin level under the different LULC scenarios. However, when looking at the subbasin level, there were differences in nitrate load among the scenarios. This suggests that the impacts of LULC on nitrate load may be more pronounced at smaller scales. Overall, our finding underscores the importance of modeling techniques in predicting the impacts of LULC change on streamflow and water quality, which can ultimately aid in the sustainable management of water resources.
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Affiliation(s)
- Tu Hoang Le
- Research Center for Climate Change, Nong Lam University-Ho Chi Minh City, Ho Chi Minh City, 700000, Vietnam
| | - Thi Ngoc Quyen Nguyen
- Faculty of Agriculture and Forestry, Tay Nguyen University, 63000, Buon Ma Thuot City, Dak Lak Province, Vietnam
| | - Thi Xuan Phan Tran
- Faculty of Agriculture and Forestry, Tay Nguyen University, 63000, Buon Ma Thuot City, Dak Lak Province, Vietnam
| | | | - Nguyen Cung Que Truong
- Institute for Environment and Resources, Vietnam National University-Ho Chi Minh City (VNU-HCM), Ho Chi Minh, 700000, Vietnam
| | - Thi Luom Le
- Dong Nai Technical Resources and Environment Center, Dong Khoi Street, Tan Hiep Ward, 810000, Bien Hoa City, Dong Nai Province, Vietnam
| | - Van Huynh Pham
- Dong Nai Technical Resources and Environment Center, Dong Khoi Street, Tan Hiep Ward, 810000, Bien Hoa City, Dong Nai Province, Vietnam
| | - Thanh Luu Pham
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi, 100000, Vietnam.
- Institute of Tropical Biology, Vietnam Academy of Science and Technology (VAST), 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, 700000, Vietnam.
| | - Thi Hoang Yen Tran
- Institute of Tropical Biology, Vietnam Academy of Science and Technology (VAST), 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, 700000, Vietnam
| | - Thanh Thai Tran
- Institute of Tropical Biology, Vietnam Academy of Science and Technology (VAST), 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, 700000, Vietnam
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Pham TL, Tran THY, Tran TT, Ngo XQ, Nguyen XD. Assessment of surface water quality in a drinking water supply reservoir in Vietnam: a combination of different indicators. RENDICONTI LINCEI. SCIENZE FISICHE E NATURALI 2022. [DOI: 10.1007/s12210-022-01086-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Nijhawan A, Howard G. Associations between climate variables and water quality in low- and middle-income countries: A scoping review. WATER RESEARCH 2022; 210:117996. [PMID: 34959067 DOI: 10.1016/j.watres.2021.117996] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 11/15/2021] [Accepted: 12/18/2021] [Indexed: 06/14/2023]
Abstract
Understanding how climate change will affect water quality and therefore, health, is critical for building resilient water services in low- and middle-income countries (LMICs) where the effect of climate change will be felt most acutely. Evidence of the effect of climate variables such as temperate and rainfall on water quality can generate insights into the likely impact of future climate change. While the seasonal effects on water quality are known, and there is strong qualitative evidence that climate change will impact water quality, there are no reviews that synthesise quantitative evidence from LMICs on links between climate variables and water quality. We mapped the available evidence on a range of climate exposures and water quality outcomes and identified 98 peer-reviewed studies. This included observational studies on the impact of temperature and rainfall events (which may cause short-term changes in contaminant concentrations), and modelling studies on the long-term impacts of sea level rise. Evidence on links between antecedent rainfall and microbiological contamination of water supplies is strong and relatively evenly distributed geographically, but largely focused on faecal indicator bacteria and on untreated shallow groundwater sources of drinking water. The literature on climate effects on geogenic contaminants was sparse. There is substantial research on the links between water temperature and cyanobacteria blooms in surface waters, although most studies were from two countries and did not examine potential effects on water treatment. Similarly, studies modelling the impact of sea level rise on groundwater salinity, mostly from south-Asia and the Middle East, did not discuss challenges for drinking water supplies. We identified key future research priorities based on this review. These include: more studies on specific pathogens (including opportunistic pathogens) in water supplies and their relationships with climate variables; more studies that assess likely relationships between climate variables and water treatment processes; studies into the relationships between climate variables and geogenic contaminants, including risks from heavy metals released as glacier retreat; and, research into the impacts of wildfires on water quality in LMICs given the current dearth of studies but recognised importance.
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Affiliation(s)
- Anisha Nijhawan
- Department of Civil Engineering and Cabot Institute for the Environment, University of Bristol, Bristol, BS8 1TR, UK.
| | - Guy Howard
- Department of Civil Engineering and Cabot Institute for the Environment, University of Bristol, Bristol, BS8 1TR, UK.
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Nguyen AT, Dao TS, Strady E, Nguyen TTN, Aimé J, Gratiot N, Némery J. Phytoplankton characterization in a tropical tidal river impacted by a megacity: the case of the Saigon River (Southern Vietnam). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:4076-4092. [PMID: 34402003 DOI: 10.1007/s11356-021-15850-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 08/02/2021] [Indexed: 06/13/2023]
Abstract
The spatiotemporal variation of phytoplankton and their relationship with environmental variables were analyzed in the Saigon River-a tropical river in Southern Vietnam. Two longitudinal profiles were conducted during dry and rainy season at 18 sampling sites covering more than 60 km long in the river. Besides, a bi-weekly monitoring conducted in the upstream, urban area (Ho Chi Minh City-HCMC), and downstream of Saigon River was organized from December 2016 to November 2017. The major phytoplankton were diatoms (e.g., Cyclotella cf. meneghiniana, Leptocylindrus danicus, Aulacoseira granulata), cyanobacteria (Microcystis spp., Raphidiopsis raciborskii, Pseudanabaena sp.), and euglenoids (Trachelomonas volvocina). Commonly freshwater phytoplankton species and sometimes brackish water species were dominant during the monitoring. Phytoplankton abundances in dry season were much higher than in rainy season (>100 times) which was explained by a shorter riverine water residence time and higher flushing capacity during the dry season. There was a clear separation of phytoplankton abundance between the urban area and the remaining area of Saigon River because of polluted urban emissions of HCMC. Redundancy analysis shows that the environmental variables (TOC, nitrogen, pH, salinity, Mo, Mn) were the driving factors related to the dominance of L. danicus and Cyclotella cf. meneghiniana in the upstream river and urban section of Saigon River. The dominance of cyanobacterium Microcystis spp. in the downstream of Saigon River was related to higher salinity, Mg, Cu concentrations, and lower concentrations of nutrients, Mn, Co, and Mo. The dominance of potentially toxic cyanobacteria in Saigon River possesses health risk to local residents especially upon the increasing temperature context and nutrient loading into the river in the next decades.
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Affiliation(s)
- An Truong Nguyen
- Institute of Engineering, Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, F-38000, Grenoble, France.
- CARE, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam.
| | - Thanh-Son Dao
- CARE, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
| | - Emilie Strady
- CARE, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam
- Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO, Marseille, France
| | - Tuyet T N Nguyen
- Institute of Engineering, Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, F-38000, Grenoble, France
- CARE, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam
| | - Joanne Aimé
- CARE, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam
| | - Nicolas Gratiot
- Institute of Engineering, Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, F-38000, Grenoble, France
- CARE, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam
| | - Julien Némery
- Institute of Engineering, Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, F-38000, Grenoble, France
- CARE, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam
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Nguyen TAD, Nguyen LT, Enright A, Pham LT, Tran HYT, Tran TT, Nguyen VHT, Tran DN. Health risk assessment related to cyanotoxins exposure of a community living near Tri An Reservoir, Vietnam. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:56079-56091. [PMID: 34041668 DOI: 10.1007/s11356-021-14545-7] [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: 03/10/2021] [Accepted: 05/19/2021] [Indexed: 06/12/2023]
Abstract
Cyanotoxins released by cyanobacteria are currently a concern due to potential impacts on plants, animals, and human health. Many instances of cyanotoxin poisoning have been reported around the world, including acute, chronic, and fatal cases. In recent years, the Tri An Reservoir (TAR) in Vietnam has experienced influxes of cyanotoxins from toxic blue-green algae at levels which exceed the World Health Organization's (WHO) permitted level of 1 μg/L. Previous studies have focused on assessing cyanobacterial diversity, the presence of cyanotoxins in water, or the effect on aquatic plants and animals. Therefore, this study aims to assess the health risks associated with cyanobacteria exposure for people living near the TAR in Dong Nai Province, Vietnam, using the Monte Carlo simulation technique. In total, 120 water samples were collected at five points of the reservoir from 2017 to 2019. Seventy-five local people who have been exposed to the water from the reservoir were interviewed. Microcystin (MC) concentration was measured with a high-pressure liquid chromatography (HPLC) system and was used to assess the health risk to local people. The results showed that the MC concentration in raw water ranged from below detection limit (BDL) to 18.67 μg/L in 2017 and from BDL to 8.6 μg/L in 2019, with the predominant variant being MC-RR. The concentration of MCs in the TAR in 2017 and 2019 exceeded the WHO's permitted level of 1 μg/L by 76% and 19%, respectively. The results showed that the rate of MC exposure likely to cause cancer was approximately 1-5%. The oral exposure rate while bathing was less than 2.5%. Direct oral exposure of cyanobacteria with no carcinogenicity was relatively high (40-50%) and the most affected group was adults.
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Affiliation(s)
- Thien An Dao Nguyen
- University of Medicine and Pharmacy at Ho Chi Minh City, 217 Hong Bang Street, District 5, Ho Chi Minh City, Vietnam
| | - Linh Thi Nguyen
- University of Medicine and Pharmacy at Ho Chi Minh City, 217 Hong Bang Street, District 5, Ho Chi Minh City, Vietnam
| | - Alexis Enright
- Institute of Environmental Science, Loyola University Chicago, 1032 W. Sheridan Road, Chicago, IL, 60660, USA
| | - Luu Thanh Pham
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi, 100000, Vietnam.
- Institute of Tropical Biology, Vietnam Academy of Science and Technology (VAST), 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, 700000, Vietnam.
| | - Hoang Yen Thi Tran
- Institute of Tropical Biology, Vietnam Academy of Science and Technology (VAST), 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, 700000, Vietnam
| | - Thai Thanh Tran
- Institute of Tropical Biology, Vietnam Academy of Science and Technology (VAST), 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, 700000, Vietnam
| | - Van Ha Thi Nguyen
- Ho Chi Minh City University of Natural Resources and Environment, 236B Le Van Sy Street, Tan Binh District, Ho Chi Minh City, 700000, Vietnam
| | - Dang Ngoc Tran
- University of Medicine and Pharmacy at Ho Chi Minh City, 217 Hong Bang Street, District 5, Ho Chi Minh City, Vietnam.
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Alves J, Pinheiro‐Silva L, Schuster KF, Matthiensen A, Petrucio MM. Environmental conditions are more effective than nutrient availability and spatial processes on explaining microphytoplankton functional structure in a subtropical hypereutrophic reservoir. AUSTRAL ECOL 2021. [DOI: 10.1111/aec.13110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jonatas Alves
- Laboratory of Freshwater Ecology Department of Ecology and Zoology Federal University of Santa Catarina (UFSC) Campus Universitário Reitor João David Ferreira Lima Florianópolis Santa Catarina 88040‐900 Brazil
| | - Lorena Pinheiro‐Silva
- Laboratory of Freshwater Ecology Department of Ecology and Zoology Federal University of Santa Catarina (UFSC) Campus Universitário Reitor João David Ferreira Lima Florianópolis Santa Catarina 88040‐900 Brazil
| | | | - Alexandre Matthiensen
- Brazilian Agricultural Research Corporation ‐ Embrapa Swine and Poultry Concórdia Santa Catarina 89715‐899 Brazil
| | - Mauricio Mello Petrucio
- Laboratory of Freshwater Ecology Department of Ecology and Zoology Federal University of Santa Catarina (UFSC) Campus Universitário Reitor João David Ferreira Lima Florianópolis Santa Catarina 88040‐900 Brazil
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Strady E, Dang TH, Dao TD, Dinh HN, Do TTD, Duong TN, Duong TT, Hoang DA, Kieu-Le TC, Le TPQ, Mai H, Trinh DM, Nguyen QH, Tran-Nguyen QA, Tran QV, Truong TNS, Chu VH, Vo VC. Baseline assessment of microplastic concentrations in marine and freshwater environments of a developing Southeast Asian country, Viet Nam. MARINE POLLUTION BULLETIN 2021; 162:111870. [PMID: 33261817 DOI: 10.1016/j.marpolbul.2020.111870] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/12/2020] [Accepted: 11/20/2020] [Indexed: 06/12/2023]
Abstract
In aquatic environments, assessment of microplastic concentrations is increasing worldwide but environments from developing countries remain under-evaluated. Due to disparities of facilities, financial resources and human resources between countries, protocols of sampling, analysis and observations used in developed countries cannot be fully adapted in developing ones, and required specific adaptations. In Viet Nam, an adapted methodology was developed and commonly adopted by local researchers to implement a microplastic monitoring in sediments and surface waters of 21 environments (rivers, lakes, bays, beaches) of eight cities or provinces. Microplastic concentrations in surface waters varied from 0.35 to 2522 items m-3, with the lowest concentrations recorded in the bays and the highest in the rivers. Fibers dominated over fragments in most environments (from 47% to 97%). The microplastic concentrations were related to the anthropogenic pressure on the environment, pointing out the necessity in a near future to identify the local sources of microplastics.
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Affiliation(s)
- Emilie Strady
- Aix-Marseille Univ., Mediterranean Institute of Oceanography (M I O), Marseille, Universite de Toulon, CNRS/IRD, France; CARE, Ho Chi Minh City University of Technology, VNU-HCM, Viet Nam.
| | - Thi Ha Dang
- Faculty of Technology and Engineering, Ba Ria - Vung Tau University, Viet Nam
| | - Thanh Duong Dao
- University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
| | - Hai Ngoc Dinh
- IMER, Institute of Marine Environment and Resources, Vietnam Academic Science and Technology, Viet Nam
| | - Thi Thanh Dung Do
- Faculty of Technology and Engineering, Ba Ria - Vung Tau University, Viet Nam
| | - Thanh Nghi Duong
- IMER, Institute of Marine Environment and Resources, Vietnam Academic Science and Technology, Viet Nam
| | - Thi Thuy Duong
- Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Viet Nam; Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Viet Nam
| | - Duc An Hoang
- Faculty of Natural Sciences, Quy Nhon University, Viet Nam
| | - Thuy Chung Kieu-Le
- Faculty of Geology and Petroleum Engineering, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Viet Nam; Vietnam National University Ho Chi Minh City, Viet Nam
| | - Thi Phuong Quynh Le
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Viet Nam; Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Viet Nam
| | - Huong Mai
- University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
| | - Dang Mau Trinh
- Faculty of Biology - Environmental Science, The University of Da Nang - University of Science and Education, Viet Nam
| | - Quoc Hung Nguyen
- CASE Center of Analytical Experimentation and Services, Ho Chi Minh City, Viet Nam
| | - Quynh Anh Tran-Nguyen
- Faculty of Chemistry, The University of Da Nang - University of Science and Education, Viet Nam
| | - Quoc Viet Tran
- CARE, Ho Chi Minh City University of Technology, VNU-HCM, Viet Nam
| | | | - Van Hai Chu
- CASE Center of Analytical Experimentation and Services, Ho Chi Minh City, Viet Nam
| | - Van Chi Vo
- Faculty of Natural Sciences, Quy Nhon University, Viet Nam
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Nguyen HQ, Ha NT, Pham TL. Inland harmful cyanobacterial bloom prediction in the eutrophic Tri An Reservoir using satellite band ratio and machine learning approaches. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:9135-9151. [PMID: 31916153 DOI: 10.1007/s11356-019-07519-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 12/23/2019] [Indexed: 06/10/2023]
Abstract
In recent years, Tri An, a drinking water reservoir for millions of people in southern Vietnam, has been affected by harmful cyanobacterial blooms (HCBs), raising concerns about public health. It is, therefore, crucial to gain insights into the outbreak mechanism of HCBs and understand the spatiotemporal variations of chlorophyll-a (Chl-a) in this highly turbid and productive water. This study aims to evaluate the predictable performance of both approaches using satellite band ratio and machine learning for Chl-a concentration retrieval-a proxy of HCBs. The monthly water quality samples collected from 2016 to 2018 and 23 cloud free Sentinel-2A/B scenes were used to develop Chl-a retrieval models. For the band ratio approach, a strong linear relationship with in situ Chl-a was found for two-band algorithm of Green-NIR. The band ratio-based model accounts for 72% of variation in Chl-a concentration from 2016 to 2018 datasets with an RMSE of 5.95 μg/L. For the machine learning approach, Gaussian process regression (GPR) yielded superior results for Chl-a prediction from water quality parameters with the values of 0.79 (R2) and 3.06 μg/L (RMSE). Among various climatic parameters, a high correlation (R2 = 0.54) between the monthly total precipitation and Chl-a concentration was found. Our analysis also found nitrogen-rich water and TSS in the rainy season as the driving factors of observed HCBs in the eutrophic Tri An Reservoir (TAR), which offer important solutions to the management of HCBs in the future.
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Affiliation(s)
- Hao-Quang Nguyen
- Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, 3058573, Japan
| | - Nam-Thang Ha
- Environmental Research Institute, School of Science, University of Waikato, Hamilton, 3260, New Zealand
- Faculty of Fisheries, University of Agriculture and Forestry, Hue University, Thua Thien Hue, 530000, Vietnam
| | - Thanh-Luu Pham
- Ho Chi Minh City University of Technology (HUTECH), 475A Dien Bien Phu Street, Ward 25, Binh Thanh District, Ho Chi Minh City, 70000, Vietnam.
- Vietnam Academy of Science and Technology (VAST), Institute of Tropical Biology, 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, 70000, Vietnam.
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The Diversity of Cyanobacterial Toxins on Structural Characterization, Distribution and Identification: A Systematic Review. Toxins (Basel) 2019; 11:toxins11090530. [PMID: 31547379 PMCID: PMC6784007 DOI: 10.3390/toxins11090530] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 09/06/2019] [Accepted: 09/09/2019] [Indexed: 11/19/2022] Open
Abstract
The widespread distribution of cyanobacteria in the aquatic environment is increasing the risk of water pollution caused by cyanotoxins, which poses a serious threat to human health. However, the structural characterization, distribution and identification techniques of cyanotoxins have not been comprehensively reviewed in previous studies. This paper aims to elaborate the existing information systematically on the diversity of cyanotoxins to identify valuable research avenues. According to the chemical structure, cyanotoxins are mainly classified into cyclic peptides, alkaloids, lipopeptides, nonprotein amino acids and lipoglycans. In terms of global distribution, the amount of cyanotoxins are unbalanced in different areas. The diversity of cyanotoxins is more obviously found in many developed countries than that in undeveloped countries. Moreover, the threat of cyanotoxins has promoted the development of identification and detection technology. Many emerging methods have been developed to detect cyanotoxins in the environment. This communication provides a comprehensive review of the diversity of cyanotoxins, and the detection and identification technology was discussed. This detailed information will be a valuable resource for identifying the various types of cyanotoxins which threaten the environment of different areas. The ability to accurately identify specific cyanotoxins is an obvious and essential aspect of cyanobacterial research.
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Li S, Lei T, Jiang F, Miao C, Yang X, Wang S, Tang L. Improvement of the process of removing phosphorus from high-phosphorus distillery effluent by ferric chloride using response surface methodology and three-step method. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2019; 79:2046-2055. [PMID: 31318342 DOI: 10.2166/wst.2019.197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The purpose of this study was to optimize the coagulation-flocculation effect of a wastewater treatment system using the response surface methodology (RSM) and three-step method to minimize phosphorus concentration in the distillate wastewater. In order to minimize the concentration of total phosphorus (TP), experiments were carried out using 33-factorial designs with three levels and three factors. A Box-Behnken design, which is the standard design of RSM, was used to evaluate the effects and interactions of three major factors (Fe:P (w/w) ratio, coagulation pH and fast mixing speed (FMS)) on the treatment efficiency. A multivariable quadratic model developed for studying the response indicated that the values for optimum conditions for Fe:P (w/w) ratio, coagulation pH and FMS were 2.40, 6.48 and 100 rev min-1, respectively. Under optimal process conditions, the TP concentration in the distillery effluent was reduced from 10 mg L-1 to 0.215 mg L-1, representing a removal efficiency of 97.85%. Based upon the statistical evaluation of results, it is inferred that RSM can be used as an appropriate approach to optimize the coag-flocculation process. Meanwhile, the study has shown that, for the equivalent dose of ferric chloride, the average three-step effect is better than that of the one-time addition.
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Affiliation(s)
- Shengjian Li
- School of Chemical Science and Technology, Yunnan University, No. 2 CuiHu North Road, Kunming, Yunnan Province 650091, China E-mail:
| | - Ting Lei
- School of Chemical Science and Technology, Yunnan University, No. 2 CuiHu North Road, Kunming, Yunnan Province 650091, China E-mail:
| | - Fang Jiang
- School of Chemical Science and Technology, Yunnan University, No. 2 CuiHu North Road, Kunming, Yunnan Province 650091, China E-mail:
| | - Changlin Miao
- School of Chemical Science and Technology, Yunnan University, No. 2 CuiHu North Road, Kunming, Yunnan Province 650091, China E-mail:
| | - Xiangjun Yang
- School of Chemical Science and Technology, Yunnan University, No. 2 CuiHu North Road, Kunming, Yunnan Province 650091, China E-mail:
| | - Shixiong Wang
- School of Chemical Science and Technology, Yunnan University, No. 2 CuiHu North Road, Kunming, Yunnan Province 650091, China E-mail:
| | - Lihong Tang
- School of Chemical Science and Technology, Yunnan University, No. 2 CuiHu North Road, Kunming, Yunnan Province 650091, China E-mail:
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Trung B, Dao TS, Faassen E, Lürling M. Cyanobacterial Blooms and Microcystins in Southern Vietnam. Toxins (Basel) 2018; 10:E471. [PMID: 30441825 PMCID: PMC6265856 DOI: 10.3390/toxins10110471] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Revised: 11/06/2018] [Accepted: 11/09/2018] [Indexed: 11/16/2022] Open
Abstract
Studies on cyanobacteria in Vietnam are limited and mainly restricted to large reservoirs. Cyanobacterial blooms in small water bodies may pose a health risk to local people. We sampled 17 water bodies in the vicinity of urban settlements throughout the Mekong basin and in southeast Vietnam. From these, 40 water samples were taken, 24 cyanobacterial strains were isolated and 129 fish, 68 snail, 7 shrimp, 4 clam, and 4 duck samples were analyzed for microcystins (MCs). MCs were detected up to 11,039 µg/L or to 4033 µg/g DW in water samples. MCs were detected in the viscera of the animals. MC-LR and MC-RR were most frequently detected, while MC-dmLR, MC-LW, and MC-LF were first recorded in Vietnam. Microcystis was the main potential toxin producer and the most common bloom-forming species. A potential health hazard was found in a duck⁻fish pond located in the catchment of DauTieng reservoir and in the DongNai river where raw water was collected for DongNai waterwork. The whole viscera of fish and snails must be completely removed during food processing. Cyanobacterial monitoring programs should be established to assess and minimize potential public health risks.
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Affiliation(s)
- Bui Trung
- Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands.
- Institute for Environment and Resources, Vietnam National University-Hochiminh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City 700000, Vietnam.
| | - Thanh-Son Dao
- Hochiminh City University of Technology, Vietnam National University-Hochiminh City, 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 700000, Vietnam.
| | - Elisabeth Faassen
- Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands.
| | - Miquel Lürling
- Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands.
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), P.O. Box 50, 6700 AB Wageningen, The Netherlands.
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Nowicka-Krawczyk P, Żelazna-Wieczorek J. Dynamics in cyanobacterial communities from a relatively stable environment in an urbanised area (ambient springs in Central Poland). THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 579:420-429. [PMID: 27876389 DOI: 10.1016/j.scitotenv.2016.11.080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 10/24/2016] [Accepted: 11/13/2016] [Indexed: 06/06/2023]
Abstract
Ambient springs are often cited as an example of an ecosystem with stable environmental conditions. A static biotope fosters the development of constant communities with a stable qualitative and relatively stable quantitative structure. Two years of studying cyanobacteria in different microhabitats of the rheocrenic and limnocrenic ambient springs located in urban areas showed that there is a high degree of cyanobacterial diversity and spatial and seasonal dynamics in communities. Spatial heterogeneity in relation to the type of spring and the type of microhabitat is reflected not only by a change in the quantitative structure (the number of species and their biomass), but also by a change in the composition of species. Seasonal changes depended on the type of spring and the type of microhabitat, where weather conditions influenced the communities by different degrees. Cyanobacterial communities of limnocrenes were more diverse in terms of composition and biomass, but they revealed a low seasonal dynamic in contrast to the communities of rheocrenes. The classification of springs based on their environmental conditions revealed that some springs were similar. The resemblance stemmed from the origin of human impact, which was reflected to a high degree in changes in the natural hydrochemical conditions of the springs. For the purpose of understanding which environmental factors had the greatest influence on cyanobacterial communities, a BIO-ENV procedure was performed. The procedure revealed that of most importance was a group of ions not related to the nature of the spring environment - NH4+, NO2-, NO3-, and PO43-. The presence of these ions in groundwater was a result of direct and indirect human activity in the area of aquifers. The dynamics in communities in the studied springs were accelerated by human impact and weather conditions.
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Affiliation(s)
- Paulina Nowicka-Krawczyk
- Laboratory of Algology and Mycology, Faculty of Biology and Environmental Protection, University of Łódź, 12/16 Banacha Street, 90-237 Łódź, Poland.
| | - Joanna Żelazna-Wieczorek
- Laboratory of Algology and Mycology, Faculty of Biology and Environmental Protection, University of Łódź, 12/16 Banacha Street, 90-237 Łódź, Poland.
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