title: Using species sensitivity distribution approach to assess the risks of commonly detected agricultural pesticides to Australia's tropical freshwater ecosystems.
abstract: To assess the potential impacts of agricultural pesticides on tropical freshwater ecosystems, the present study developed temperature-specific, freshwater species protection concentrations (i.e., ecotoxicity threshold values) for 8 pesticides commonly detected in Australia's tropical freshwaters. Because relevant toxicity data for native tropical freshwater species to assess the ecological risks were mostly absent, scientifically robust toxicity data obtained at ≥20 °C were used for ecologically relevant taxonomic groups representing primary producers and consumers. Species sensitivity distribution (SSD) curves were subsequently generated for predicted chronic exposure using Burrlioz 2.0 software with mixed chronic and converted acute data relevant to exposure conditions at ≥20 °C. Ecotoxicity threshold values for tropical freshwater ecosystem protection were generated for ametryn, atrazine, diuron, metolachlor, and imidacloprid (all moderate reliability), as well as simazine, hexazinone, and tebuthiuron (all low reliability). Using these SSD curves, the retrospective risk assessments for recently reported pesticide concentrations highlight that the herbicides ametryn, atrazine, and diuron are of major concern for ecological health in Australia's tropical freshwater ecosystems. The insecticide imidacloprid also appears to pose an emerging threat to the most sensitive species in tropical freshwater ecosystems. The exposed temperature-specific approach may be applied to develop water quality guideline values for other environmental contaminants detected in tropical freshwater ecosystems until reliable and relevant toxicity data are generated using representative native species.
authors.affiliation: Department of Zoology and Environmental Management, University of Kelaniya, Kelaniya, Sri Lanka.
authors.forename: Asoka
authors.initials: A
authors.lastname: Pathiratne
authors.affiliation: Commonwealth Scientific and Industrial Research Organisation (CSIRO) Ecosystem Sciences, Atherton, Queensland, Australia.|Australian Institute of Marine Science, Townsville, Queensland, Australia.
authors.forename: Frederieke J
authors.initials: FJ
authors.lastname: Kroon
mesh_terms: D016573:Agrochemicals / Q000633:toxicity*; D000818:Animals; D001315:Australia; D017753:Ecosystem; D005618:Fresh Water; D006540:Herbicides / Q000633:toxicity; D007306:Insecticides / Q000633:toxicity; D019055:No-Observed-Adverse-Effect Level; D010575:Pesticides / Q000633:toxicity*; D015203:Reproducibility of Results; D018570:Risk Assessment; D013045:Species Specificity; D014329:Tropical Climate; D014874:Water Pollutants, Chemical / Q000633:toxicity*; D060753:Water Quality / Q000592:standards
chemical_list: D016573:Agrochemicals; D006540:Herbicides; D007306:Insecticides; D010575:Pesticides; D014874:Water Pollutants, Chemical
keywords: Freshwater toxicology; Pesticides; Risk assessment; Tropical ecotoxicology; Water quality guidelines