The study of heavy metal pollution in the surface fauna and hyporheic fauna Presenting Author: Samira Sabri, Co-Authors:Belaidi Nouria UNIVERSITY Abu Bakr BELKAID-TLEMCEN. Department of Ecology and Environment Laboratory of Ecology and Natural Ecosystems Management. , Tlemcen, Algeria. eco_alg2008@yahoo.fr Abstract: The stydy of upstream and downstream evolution of hyporeic fauna compared to here of surface environment ,it is realised in average and low Tafna on downstream dam . Listed fauna includes understands 28 tax,dominated by the larvae of insects “in particular Chironomidae “ and the Oligochetes “Tubificidae”( the indicator fauna of pollution). the diversity of fauna is particular influence by the environment conditions(heavy metal pollution). The results are indicating diminution of fauna in hyporeic and surface environment ,it is cither due to the extinction or the migration of the fauna to deeper layers. The composition of fauna in three stations is show to the station T6 called receptive of dam water is more affected by pollution of heavy metals with low diversity. Keys words: North-west of Algeria-hyporeic fauna-surface fauna-pollution- heavy metals-Tafna wadi References: Malard,F.,REYGROBELLET, J.L,MATHIEU,J.et LAFONT M., The use of invertebrate.communities to describe ground water flow and contaminate transport in a factured rock aquifer.Archir fur hydrobiology(1994) 131:93p MARMONIER,P et CREUZE DES CHATELLIERS,Effects of spates on interstitiel assemblages of the Rhone River importance of heterogeity(1991)46 :78p. MESTROV, M. ,et LATTINGER-PENKO,R.investigation of the mutuel influence between a polluted River and its hyporheic(1981) 98-120p. NOTENBOOM,J.et SERRANO,R.the phreatic aquifer of the plasma de catellon(Spain): Relation ships between animal assemblage and groundwater pollution.Bull.hydrologia.279Spain (1995) 241-249p [1] Authors, Journal, Issue (Year) page. Figures