Biomonitoring of the Water Quality in the River Warche (Belgium): Impact of Tributaries and Sewage Effluent

Assessment of Pollution in Sidi M'Hamed Benali Lake (Algeria) Based on Bioindicators and Physicochemical Parameters

“…The increase in NO 3 -during rainy season could be attributed to the scrubbing of fertilizers used in the agricultural grounds located on lakesides and the training of waste of vegetable and animal. However the decrease in NO 3 -during summer, is probably associated with active uptake of this element by the phytoplankton and the plants (this period is characterized by a very strong vegetation), and due to the action of denitrifying bacteria which are quite active at high temperature (this is according to [39]). According to the results we notice a decrease in the NO 3 -concentrations and an increase in those of NO 2 -.…”

“…The lake is located at the outskirts of the mountainous massif of Tessala, Hajar, and Meraei Kerrouche, which is a southern watershed feeding the different bodies of water in the region during the rainy periods. It has a capacity of about 3 million m 3 and a maximum depth of 30 m. It's subject to a semi-arid climate with cool winters and dry season followed by a short rainy season. The highly variable rainfall from year to year, on average 400mm.…”

“…The collected samples were brought to laboratory and filtered with the same net (55 µm). The zooplankton recuperate was anaesthetized immediately in saturated CO 2 solution (V/V: mineral water + commercial soda-water) and fixed by 4% formaldehyde according to literature recommendations [3,4]. The identification of the individual is carried with a binocular loupe (Olympus, SZ60) or a contrasting phase microscope (Olympus BX50).…”

“…It deserves a very detailed attention, considering which it very faded and is seriously threatened by the natural processes (weathering processes, precipitation rate, soil erosion) and the anthropogenic activities [1]. The latter, induce strong alterations of physicochemical characteristics and of biocenose diversity that could have dangerous consequences for the whole ecosystem [2][3][4]. Thus, they generate polluting elements which damage their use for drinking, bathing, industrial, agricultural, reaction or other purposes [5,6].…”

“…Zooplankton is a good indicator of changes in water quality because it is strongly affected by environmental conditions and responds quickly to changes in environmental quality [3,4,7,9,10]. Among zooplankton, some cladocères as Bosmina longirostris and Chydorus sphaericus are commonly used as eutrophic indicators of conditions [10].…”