Contribution à la bioévaluation de la qualité des eaux du barrage de « Babar, khenchela » par les indices diatomiques
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Date
2019
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Université Abbes Laghrour -Khenchela-
Abstract
Abstract
Diatoms are microscopic unicellular brown algae that develop in all types of aquatic environments (cold or hot, freshwater or saline, polluted or not). They constitute one of the best bio-indicators groups of waters.
In this context, the purpose of this study was to study the diatom flora in the waters of Babar, dam "khenchela", on upstream and downstream (entry and exit waters) and connect the distribution of the assemblages of diatom species to environmental variables and the variations in water quality.
To estimate the biological quality of the dam water; Five (05) diatomic indices were tested: the Diatomic Biological Index (DBI), Polluo- sensitivity Index (SPI), Generic Diatomic Index (GDI), Shannon and Weaver Biodiversity Index, and auto-ecology index of Van dam et al. (1994) which assigns each diatom species an ecological values by parameters, thus creating different classes of water quality. These indices include parameters related to the presence of organic matter, nutrients as well as other parameters, such as chlorides, conductivity and pH.
The analysis indicated that there were no important differences in water quality at the two stations. Although the results obtained show heterogeneous stands in terms of affinity or sensitivity in the same station.
This indicates that the Babar Dam appears to have been disturbed by intermittent or occasional pollution by organic matter and, to a lesser extent with anthropogenic or natural disturbances causing an imbalance in the mineral composition of water.