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QUALITY OF RIVERS IN THE ARTOIS-PICARDIE WATER BASIN

QUALITY OF RIVERS IN THE ARTOIS-PICARDIE WATER BASIN. Qualité de l’altération :. Qualité des eaux vis-à-vis des différentes altérations :. Très bonne. Très bonne. Bonne. Bonne. Moyenne. Moyenne. Médiocre. Médiocre. Mauvaise. Mauvaise. Qualité de l’altération :.

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QUALITY OF RIVERS IN THE ARTOIS-PICARDIE WATER BASIN

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  1. QUALITY OF RIVERS IN THE ARTOIS-PICARDIE WATER BASIN

  2. Qualité de l’altération : Qualité des eaux vis-à-vis des différentes altérations : Très bonne Très bonne Bonne Bonne Moyenne Moyenne Médiocre Médiocre Mauvaise Mauvaise

  3. Qualité de l’altération : Qualité des eaux vis-à-vis des différentes altérations : Très bonne Très bonne Bonne Bonne Moyenne Moyenne Médiocre Médiocre Mauvaise Mauvaise

  4. Qualité de l’altération : Qualité des eaux vis-à-vis des différentes altérations : Très bonne Très bonne Bonne Bonne Moyenne Moyenne Médiocre Médiocre Mauvaise Mauvaise

  5. Qualité de l’altération : Qualité des eaux vis-à-vis des différentes altérations : Très bonne Très bonne Bonne Bonne Moyenne Moyenne Médiocre Médiocre Mauvaise Mauvaise

  6. QUALITE DES PEUPLEMENTS PISCICOLES DES STATIONS R.H.P. ESTIMEE PAR L’INDICE POISSON RIVIERES IPR DANS LE BASSIN ARTOIS-PICARDIE EN 2001

  7. Statement • Water quality is slowly and regularly increasing, • Biological quality is increasing more slowly or is constant several causes : • Boundary effect (total phosphorus example) • Habitat damage • Other forms of pollution… • Eutrophication, • Contamination of water and sediments by heavy metals and organic substances …which were masked in the past

  8. Boundary effect : phosphorus example Aptitude à la biologie SEQ eau v2 PO4 mg/l P mg/l < 0,1 < 0,05 0,1 à 0,5 0,05 à 0,2 0,5 à 1 0,2 à 0,5 1 à 2 0,5 à 1 > 2 > 1 Très bonne Bonne Moyenne Médiocre Mauvaise

  9. Habitat damage Organisms need a high quality environment to grow and to reproduce !

  10. Other forms of pollutions which were masked Eutrophication Water quality improvement allows all aquatic plants to develop especially when phosphorus and nitrogen are aboundant, Some vascular plants proliferations are often favoured by habitat damages (hydrology disturbances, absence of riverine vegetation, of predators…)

  11. Duckweeds can cover all the surface in lentic rivers resulting in a biological desert and large quantities of organic matter Riparian vegetation is sometimes composed of exotic species for which elimination is difficult or impossible

  12. A dangerous species : the "jussie"

  13. Toxic substances Pesticides, heavy metals, organic substances and oestrogen-like substances disturb the main physiological functions and threaten animal and plant life.

  14. Impact of contamination on diatoms (algae) (river Deûle) Gomphonema truncata Navicula trivialis Fragilaria capucina var. gracilis Amphora pediculus

  15. mentum Cephalic capsule in ventral view Deformation of chironomid larvae by metals (d'après Milard, 2000) A : egg ; B : larvae ; C : nymph ; D : adult

  16. Deformation of chironomid larvae by metals Normal mentum Absence of tooth Type of Köhn-gap Global asymmetry Supernumerary tooth

  17. Contamination of fish in Artois-Picardie water basin

  18. Impact of endocrine disruptors intersexual gudgeon with polynucleated ovocytes Photos C. Minier (Univ. Le Havre) Intersex fish testicle

  19. Conclusions • Water quality is slowly increasing but contamination of water and sediments remains important, • Biological indicators quality is more slowly increasing and is limited by habitat damage, eutrophication and toxic substances, • Sediments can release various pollutants such as phosphorus, toxic substances. This release depends on the changes in water quality.

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