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Methodology approach using effect-based monitoring tools to link surface water quality, ecotoxicity and pollutants availability

AuthorsRoig, Neus; Sierra, Jordi; Moreno-Garrido, Ignacio ; Nieto, Elena ; Hampel, Miriam ; Nadal, Martí; Blasco, Julián ; Schuhmacher, Marta
Issue DateMay-2015
CitationSETAC Europe 25th Annual Meeting (2015)
AbstractAccording to the European Water Framework Directive, the assessment of the ecological status of freshwater systems is based on biological, physicochemical and hydromorphological quality. Some studies have observed that biological status is not always in coherence with chemical status, maybe due to the adaptation mechanisms of aquatic organisms under chronic chemical exposure. In these situations, ecotoxicity tests could be useful to resolve these divergences. The use of effect-based monitoring tools has been mentioned in the context on the Common Implementation Strategy (CSI) focused on regulated substances, which involves that many substances are not considered and their contributions to toxicity are lacking. The general aim of this study is to design a methodology to categorize the ecotoxicological status of rivers. The specific aims are: to compare the effectiveness of different ecotoxicity tests performed with freshwater sediments; to evaluate the relation between ecological status, pollutant concentent, their bioavailability, and water and sediment ecotoxicit y; and to develop a general methodology to evaluate the relative contribution of the main pollutants to the toxicity in order to improvemanagement tools. Two sampling campaings were carried out in 2013 and 2014 within the Ebro River (Spain) watershed. Therteen composite samples of sediments were collected and data on the chemical and ecologycal status has been achieved. The ecotoxicity of pore water and whole sediments was evaluated by Vibrio fischeri, Nitzschia palea, Pseudokirshneriella subcapitata, Daphnia magna and Chironomus riparius. In addition, the trace metals bioavailability was calculated by a sequential extraction according to the BCR method. To distinguish the potentially toxic fraction associated to trace metals burden of sediments, an analysis of acid-volatile sulphide and simultaneously extracted metals was performed. The results indicate that the ecotoxicological approach in most of the analyzed sediments is in agreement with their ecological status. This study demonstrates that the integration of chemical, biological and ecotoxicological analyses could be crucial to understand the hazard of pollutants in aquatic ecosystems, especially, in freshwater sediments. Moreover, it corroborates that cost-effective and rapid screening short-term bioas says could be useful to determine the surface water ecotoxicological status.
DescriptionTrabajo presentado en la SETAC Europe 25th Annual Meeting (Environmental protection in a multi-stressed world: challenges for science, industry and regulators), celebrada en Barcelona del 3 al 7 de mayo de 2015.
Appears in Collections:(ICMAN) Comunicaciones congresos
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