Assessment of sediment ecotoxicological status as a complementary tool for the evaluation of surface water quality: the Ebro river basin case study.

摘要: According to the European Water Framework Directive (WFD), assessment of surface water status is based on ecological and chemical that not always in coherence. In these situations, ecotoxicity tests could help obtain a better characterization ecosystems. The general aim this work design methodology study ecotoxicological freshwater systems. This be useful complementary status, for For purpose, sediments from thirteen sampling sites within Ebro river watershed (NE Spain) were collected characterization. pore has been evaluated employing test organisms Vibrio fischeri, Pseudokirschneriella subcapitata Daphnia magna, while whole sediment was using Nitzschia palea Chironomus riparius. An analysis acid-volatile sulfide (AVS) simultaneously extracted metals (SEM) performed evaluate toxicity associated bioavailable metals. Moreover, data about priority pollutants defined by WFD water, fish as well each point provided Monitoring Control Program bodies. terms, bioassays have shown more than tests. Among different used, P. C. riparius most sensitive sediment, respectively. Our evaluation showed high coincidences with established according WFD, especially when ecosystem disruption due numerous stressors (presence organic pollution) observed. These results allow us confirm that, affect functioning negatively, an approach, suitable detect changes accurate sensitivity.