title: Pesticides in fluvial wetlands catchments under intensive agricultural activities.
abstract: A survey on pesticides (73 compounds) in the Bay St. François wetland and its catchment (part of the wetlands of Lake St. Pierre area [St. Lawrence River, Québec]) was achieved in 2006. The metabolites as well as the active ingredients of pesticides (11 compounds) were detected in the wetland and its catchment. This wetland ecosystem was active in the degradation of agricultural pesticides (e.g., atrazine). The measured pesticides were individually below the criteria for aquatic species in natural water, except chlorpyrifos. Overall, the pesticides lost from agricultural field towards the streams were <1% of the quantity applied. The environmental fates of the pesticides were found to vary according to the size of the watershed. Over large catchments, half-life times were important in terms of global loss from the agricultural lands to wetlands whereas over small catchments, soil organic carbon/water distribution coefficient (Koc) was an important term for pesticides losses to water system since half-life times were not limiting factors.
authors.affiliation: Direction des Sciences & Technologie, Environnement Canada, 105 McGill, 7e étage (Youville), Montréal, QC, Canada H2Y 2E7. Laurier.Poissant@ec.gc.ca
authors.forename: Laurier
authors.initials: L
authors.lastname: Poissant
authors.forename: Conrad
authors.initials: C
authors.lastname: Beauvais
authors.forename: Pierre
authors.initials: P
authors.lastname: Lafrance
authors.forename: Christian
authors.initials: C
authors.lastname: Deblois
mesh_terms: D000383:Agriculture; D002170:Canada; D004784:Environmental Monitoring / Q000379:methods; D005618:Fresh Water / Q000737:chemistry; D007220:Industrial Waste / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D053833:Wetlands
chemical_list: D007220:Industrial Waste; D010575:Pesticides; D014874:Water Pollutants, Chemical