title: Ecotoxicological evaluation of Mediterranean dredged sediment ports based on elutriates with oyster embryotoxicity tests after composting process.
abstract: The ecotoxicological effect of dredged sediments was estimated by embryo-larval toxicity of the oyster Crassosstrea gigas in sediment elutriates (filtered and unfiltered). The study covers the main ports from the French Mediterranean coast. Composted sediments from a navy harbour (A), a commercial port (B) and two composite specimens (C and D) obtained after mixing various sediments were taken into consideration. Effective concentrations affecting 50% of larvae (EC50) were obtained from different elutriate concentrations (from 0 to 100%). Toxicity results obtained from filtered elutriates decreased according to the following gradient: sample A (5.68%), B (20.50%), C (37.60%) and D (47.17%). Chemical concentrations in whole sediments were in agreement with those in elutriates. Among the measured contaminants in elutriates, Cu and Zn resulted as the main contributors to toxicity. Dissolved organic carbon played an important role by exerting a protective effect against the toxicity of dissolved Cu. Toxicity results were interpreted on the basis of toxicity scores to give indication about sediment quality which provided more severe judgement than risk score based on chemical concentrations in sediments.
authors.affiliation: Laboratoire de Radiochimie, Sciences Analytiques et Environnement (LRSAE), University of Nice Sophia Antipolis, Faculté des Sciences, Nice, France.
authors.forename: Yannick
authors.initials: Y
authors.lastname: Mamindy-Pajany
authors.forename: Giovanni
authors.initials: G
authors.lastname: Libralato
authors.forename: Michèle
authors.initials: M
authors.lastname: Roméo
authors.forename: Charlotte
authors.initials: C
authors.lastname: Hurel
authors.forename: Chiara
authors.initials: C
authors.lastname: Losso
authors.forename: Annamaria Volpi
authors.initials: AV
authors.lastname: Ghirardini
authors.forename: Nicolas
authors.initials: N
authors.lastname: Marmier
mesh_terms: D000818:Animals; D054750:Ecotoxicology / Q000379:methods*; D004625:Embryo, Nonmammalian / Q000002:abnormalities / Q000187:drug effects*; D005374:Filtration; D005602:France; D019015:Geologic Sediments / Q000737:chemistry*; D019083:Mediterranean Region; D010125:Ostreidae / Q000187:drug effects / Q000196:embryology*; D012015:Reference Standards; D012623:Seawater / Q000737:chemistry; D012987:Soil; D018675:Toxicity Tests; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D012987:Soil; D014874:Water Pollutants, Chemical