Blooms of Toxic Cyanobacteria in Freshwater in Algeria

Nasri, Hichèm; Bouaı̈cha, Noureddine

doi:10.26480/wcm.02.2017.05.06

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…Due to the flexibility of such tools, several land-use scenarios can be quickly evaluated, assessed, and compared. Even though this study only considered simple land-use change scenarios such as percentage increase in urban area, the effect of such land-use change is quickly apparent [32,33]. Moreover, more detailed examination of the impact and effects on each hydrological component can be performed.…”

Section: Resultsmentioning

confidence: 99%

Response of hydrological system to urbanization: a case study in Tianjin City, China

Wei¹,

Zhang²,

Singh³

et al. 2019

Desalination and Water Treatment

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Urbanization, which essentially creates more impervious surfaces, is an inevitable part of modern societal development throughout the world. Hence, it is important to understand the impact of urbanization on the water cycle as it helps people understand how urbanization will severely disturb the environment and assist policy makers in balancing development and environment sustainability. The objective of this study is to understand and quantify the sensitivity of the hydrological system to urbanization. A coupled rural-urban hydrological model, MODCYCLE, was set up to simulate the effect of changes in land use on daily streamflow and groundwater and applied to the Tianjin watershed in China. The model uses digital elevation maps, land use, soil, meteorological, and climatic data to represent important parameters in the catchment. The fraction of impervious surface was used as a surrogate to quantify the degree of land-use change. The results show that the expansion of urban areas had a great influence on generation of flow processes and on evapo-transpiration. The surface runoff was more sensitive to urbanization. Based on the results from this model, people can make more informed decisions regarding the extension of urbanization and attempting to balance sustainability and development.

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Section: Resultsmentioning

confidence: 99%

Response of hydrological system to urbanization: a case study in Tianjin City, China

Wei¹,

Zhang²,

Singh³

et al. 2019

Desalination and Water Treatment

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show abstract

“…On the African continent, the environmental conditions are very conducive to continued proliferation of potentially toxic cyanobacteria (Ndlela et al 2016). For example in the North African basin, in Egypt (Mohamed 2016), in Morocco (Oudra et al 2001;Ouhsassi et al 2021), in Algeria (Nasri et al 2007;Nasri and Bouaïcha 2017) and in Tunisia (El Herry et al 2008;Fathalli et al 2015) blooms of cyanobacteria have been observed in several fresh surface waters during the warmer months, particularly in summer and early fall. Some arid West African countries such as Mauritania have made signi cant efforts to mobilize surface water resources through the construction of dams.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Occurrence of Cyanobacteria and First Detection of Microcystin-LR in Water Column of Foum-Gleita Reservoir, Mauritania

et al. 2022

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This work was carried out to study the seasonal occurrence of cyanobacteria and their microcystin-LR in water column of Foum-Gleita reservoir (Mauritania). Limnological and biological factors were investigated at three depths (surface, -3, and -6 m) in this reservoir during a full year. Nutrients were analyzed by Spectrophotometry, phytoplankton was analyzed by Inverted Microscopy, microsystins were analyzed by High Performance Liquid Chromatography-tandem Mass Spectrometry and environmental factors relationships were analyzed by Pearson's correlation and Multiple Linear Regression. Physicochemical analyzes have shown that this reservoir is hypereutrophic with dissolved inorganic nitrogen and total phosphorus concentrations relatively high, varying from 1.39 to 6.53 and 0.21 to 0.57 mg/L, respectively. Annual surface water temperature was exceptionally high (27.8 ± 3.6°C), characterizing of a Sahelian climatic conditions. Phytoplankton analyzes have shown dominance of two toxic cyanobacteria species Microcystis aeruginosa and Dolichospermum os-aquae during warm season (May-September). Microcystins analysis revealed presence of only most toxic variant, microcystin-LR. Microcystin-LR concentration in the surface water samples, during cyanobacterial blooms, was consistently high (5.638 µg/L), exceeding 5-times the World Health Organization drinking water limit (1 µg/L), however, it was much lower (0.83 µg / L) at depth (-6 m). Analysis of environmental factors relationships showed that the most in uential factors on abundance of Microcystis aeruginosa and Dolichospermum os-aquae and variability of microcystin-LR concentrations were total phosphorus, dissolved inorganic nitrogen, iron, temperature and pH. Finally, the study clearly demonstrated need for regular monitoring of cyanobacteria and cyanotoxins in the waters of studied reservoir.

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Section: Introductionmentioning

confidence: 99%

Seasonal Occurrence of Cyanobacteria and First Detection of Microcystin-LR in Water Column of Foum-Gleita Reservoir, Mauritania

Sadegh¹,

Sidoumou²,

Dia³

et al. 2021

Preprint

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This work was carried out to study the seasonal occurrence of cyanobacteria and their microcystin-LR in water column of Foum-Gleita reservoir (Mauritania). Limnological and biological factors were investigated at three depths (surface, -3, and -6 m) in this reservoir during a full year. Nutrients were analyzed by Spectrophotometry, phytoplankton was analyzed by Inverted Microscopy, microsystins were analyzed by High Performance Liquid Chromatography-tandem Mass Spectrometry and environmental factors relationships were analyzed by Pearson's correlation and Multiple Linear Regression. Physicochemical analyzes have shown that this reservoir is hypereutrophic with dissolved inorganic nitrogen and total phosphorus concentrations relatively high, varying from 1.39 to 6.53 and 0.21 to 0.57 mg/L, respectively. Annual surface water temperature was exceptionally high (27.8 ± 3.6°C), characterizing of a Sahelian climatic conditions. Phytoplankton analyzes have shown dominance of two toxic cyanobacteria species Microcystis aeruginosa and Dolichospermum flos-aquae during warm season (May-September). Microcystins analysis revealed presence of only most toxic variant, microcystin-LR. Microcystin-LR concentration in the surface water samples, during cyanobacterial blooms, was consistently high (5.638 µg/L), exceeding 5-times the World Health Organization drinking water limit (1 µg/L), however, it was much lower (0.83 µg / L) at depth (-6 m). Analysis of environmental factors relationships showed that the most influential factors on abundance of Microcystis aeruginosa and Dolichospermum flos-aquae and variability of microcystin-LR concentrations were total phosphorus, dissolved inorganic nitrogen, iron, temperature and pH. Finally, the study clearly demonstrated need for regular monitoring of cyanobacteria and cyanotoxins in the waters of studied reservoir.

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Blooms of Toxic Cyanobacteria in Freshwater in Algeria

Cited by 8 publications

References 7 publications

Response of hydrological system to urbanization: a case study in Tianjin City, China

Response of hydrological system to urbanization: a case study in Tianjin City, China

Seasonal Occurrence of Cyanobacteria and First Detection of Microcystin-LR in Water Column of Foum-Gleita Reservoir, Mauritania

Seasonal Occurrence of Cyanobacteria and First Detection of Microcystin-LR in Water Column of Foum-Gleita Reservoir, Mauritania

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