Eutrophication of Ethiopian water bodies: a serious threat to water quality, biodiversity and public health

Fetahi, Tadesse

doi:10.2989/16085914.2019.1663722

Cited by 55 publications

(36 citation statements)

References 56 publications

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“…Furthermore, industries housed in Hawassa Industrial Park (HIP) are known to release effluents into rivers and streams that end up into the swampy area of the Lake Shallo, from which River Tikurwhua originates (Zinabu et al, 2002) and feeds the lake. The water level of Hawassa Lake is increasing and the depth of water decreases due to sedimentation and eutrophication (Fetahi, 2019;Steinberger et al, 2019).…”

Section: Eutrophicationmentioning

confidence: 99%

Evaluation of water quality and eutrophication status of Hawassa Lake based on different water quality indices

2021

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Lake Hawassa is one of the major Ethiopian Rift Valley Lakes having an endorheic basin system. The surrounding community makes use of the lake water for the multiple purposes of irrigation, domestic water supply, recreation and fish harvesting. The aim of the present study was to ascertain the water quality of the lake in terms of water quality indices (WQI) and its health over a period of three months covering both dry and wet seasons. Overall, the water quality of Lake was unfit and bad as per the weighted arithmetic method (120.06–228.29) and modified Bascarón water quality index (MBWQI) methods (26.81–33.89), respectively. However, the quality was indicated as marginal, as per the Canadian Council of Ministers of the Environment (CCME) water quality index method (44.2–51.1). On average, the lake was under the hypertrophic stage as per the standard based on the results of Secchi depth and nutrient concentration. The current study showed the lake being unfit for all-purposes as per WAWQI range (> 100). According to the physicochemical and biological parameters, of the lake, it requires mitigation measures to control Eutrophication and pollutants inflow.

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Section: Eutrophicationmentioning

confidence: 99%

Evaluation of water quality and eutrophication status of Hawassa Lake based on different water quality indices

2021

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“…The use of many chemical fertilizers and pesticides and unreasonable farming methods have caused substantial soil erosion [ 7 ], which directly leads to the loss of soil nutrients in sloping farmland. Nutrient loss causes a decline in the productivity of sloping farmland [ 8 ]; on the other hand, it also causes eutrophication of surface water bodies [ 9 , 10 ]. The karst area in southern China covers 540,000 square kilometers, accounting for 55% of China’s total karst area.…”

Section: Introductionmentioning

confidence: 99%

Effects of rainfall intensity on runoff and nutrient loss of gently sloping farmland in a karst area of SW China

et al. 2021

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Nutrient losses from sloping farmland in karst areas lead to the decline in land productivity and nonpoint source pollution. A specially tailored steel channel with an adjustable slope and underground hole fissures was used to simulate the microenvironment of the "dual structure" of the surface and underground of sloping farmland in a karst area. The artificial rainfall simulation method was used to explore the surface and underground runoff characteristics and nutrient losses from sloping farmland under different rainfall intensities. The effect of rainfall intensity on the nutrient loss of farmland on karst sloping land was clarified. The results showed that the surface was the main route of runoff and nutrient loss during the rainy season on sloping farmland in karst areas. The influence of rainfall intensity on the nutrients in surface runoff was more substantial than that on underground runoff nutrients. Nutrient loss was more likely to occur underground than on the surface. The losses of total nitrogen, total phosphorus, and total potassium in surface and underground runoff initially increased and then gradually stabilized with the extension of rainfall duration and increased with increasing rainfall intensity and the amount of nutrient runoff. The output of nutrients through surface runoff accounted for a high proportion of the total, and underground runoff was responsible for a low proportion. Although the amount of nutrients output by underground runoff was small, it could directly cause groundwater pollution. The research results provide a theoretical reference for controlling land source pollution from sloping farming in karst areas.

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“…From these data, it seems that growing eutrophication of these ecosystems [e.g. [4][5][6][7] and increasing pollution by pharmaceutical products [8] and other pollutants, such as organochlorine pesticides [9] and heavy metals [10], are occurring. The extent of this pollution remains largely unknown for most surface water sources.…”

Section: Introductionmentioning

confidence: 99%

Assessment of some key indicators of the ecological status of an African freshwater lagoon (Lagoon Aghien, Ivory Coast)

et al. 2021

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The supply of drinking water is a vital challenge for the people who live on the African continent, as this continent is experiencing strong demographic growth and therefore increasing water demands. To meet these needs, surface water resources are becoming increasingly mobilized because underground resources are not always available or have already been overexploited. This situation is the case in the region of Abidjan in the Ivory Coast, where the drinking water deficit is a growing problem and it is therefore necessary to mobilize new water resources to ensure the supply of drinking water. Among the potential resources, local managers have identified a freshwater lagoon, Lagoon Aghien, That is in close proximity to the city of Abidjan. With the aim of enhancing knowledge on the ecological functioning of the lagoon and contributing to the assessment of its ability to provide drinking water, several physical and chemical parameters of the water and the phytoplankton community of the lagoon were monitored for 17 months (December 2016-April 2018) at six sampling stations. Our findings show that the lagoon is eutrophic, as evidenced by the high concentrations of total phosphorus (>140 μg L-1), nitrogen (1.36 mg L-1) and average chlorophyll-a (26 to 167 μg L-1) concentrations. The phytoplankton community in the lagoon is dominated by genera typical of eutrophic environments including mixotrophic genera such as Peridinium and by cyanobacteria such as Cylindrospermopsis/Raphidiopsis, Microcystis and Dolichospermum that can potentially produce cyanotoxins. The two rainfall peaks that occur in June and October appeared to be major events in terms of nutrient flows entering the lagoon, and the dynamics of these flows are complex. Significant differences were also found in the nutrient concentrations and to a lesser extent in the phytoplankton communities among the different stations, especially during the rainfall peaks. Overall, these results reveal that the quality of the lagoon’s water is already severely degraded, and this degradation could increase in future years due to increasing urbanization in the watershed. These results therefore raise questions about the potential use of the lagoon as a source of drinking water if measures are not taken very quickly to protect this lagoon from increasing eutrophication and other pollution sources.

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Eutrophication of Ethiopian water bodies: a serious threat to water quality, biodiversity and public health

Cited by 55 publications

References 56 publications

Evaluation of water quality and eutrophication status of Hawassa Lake based on different water quality indices

Evaluation of water quality and eutrophication status of Hawassa Lake based on different water quality indices

Effects of rainfall intensity on runoff and nutrient loss of gently sloping farmland in a karst area of SW China

Assessment of some key indicators of the ecological status of an African freshwater lagoon (Lagoon Aghien, Ivory Coast)

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