ABSTRACT:The community structure of plankton was studied in relation to physico-chemical characteristics of the river Talar polluted by industrial effluents and domestic sewage from November 2008 to July 2009. In addition, seasonal changes in phytoplankton and zooplankton populations and species abundance were also determinate. The dominant phytoplanktonic algae determined were Oscillatoria, Anabaena, Nostoc, Spirogyra, Pediastrum, Navicula and Nitzschia. The dominant zooplanktonic organisms determined were Paramecium, Daphnia, Cypris, Keratalla and Arachinous. The present study on ecology and the surface water of this fresh water river covered a number of aspects, beginning from abiotic and biotic parameters to pollution assessment and thereby reveals a true picture of the water quality of the river .@JASEM Studies on the structure and functioning of planktonic communities in reservoir ecosystems provide opportunities to investigate patterns of responses to cyclical variations and episodic disturbances. The understanding of plankton dynamics in reservoirs can also be useful to evaluate the resilience of this kind of ecosystem, which can present deep changes in limnological conditions in relatively short periods. This dynamic is generated by short-term variations in the water retention time, flux regime, outflow and level and by interactions with other aquatic and terrestrial ecosystems in the catchment area. The heterogeneity frequently observed in the distribution of zooplankton in reservoirs is caused by interactions between physical and biological processes. This variability is related to water movements and to the quality and quantity of resources brought into the system by tributary rivers (Threlkeld
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