title: Dynamics and recovery of a sediment-exposed Chironomus riparius population: A modelling approach.
abstract: Models can be used to assess long-term risks of sediment-bound contaminants at the population level. However, these models usually lack the coupling between chemical fate in the sediment, toxicokinetic-toxicodynamic processes in individuals and propagation of individual-level effects to the population. We developed a population model that includes all these processes, and used it to assess the importance of chemical uptake routes on a Chironomus riparius population after pulsed exposure to the pesticide chlorpyrifos. We show that particle ingestion is an important additional exposure pathway affecting C. riparius population dynamics and recovery. Models ignoring particle ingestion underestimate the impact and the required recovery times, which implies that they underestimate risks of sediment-bound chemicals. Additional scenario studies showed the importance of selecting the biologically relevant sediment layer and showed population effects in the long term.
authors.affiliation: Aquatic Ecology and Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands. Electronic address: noeldiepens@gmail.com.
authors.forename: Noël J
authors.initials: NJ
authors.lastname: Diepens
authors.affiliation: Alterra, Wageningen UR, P.O. Box 47, 6700 AA Wageningen, The Netherlands.
authors.forename: Wim H J
authors.initials: WHJ
authors.lastname: Beltman
authors.affiliation: Aquatic Ecology and Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands; IMARES, Institute for Marine Resources & Ecosystem Studies, Wageningen UR, P.O. Box 68, 1970 AB IJmuiden, The Netherlands.
authors.forename: Albert A
authors.initials: AA
authors.lastname: Koelmans
authors.affiliation: Aquatic Ecology and Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands; Alterra, Wageningen UR, P.O. Box 47, 6700 AA Wageningen, The Netherlands.
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Van den Brink
authors.affiliation: Alterra, Wageningen UR, P.O. Box 47, 6700 AA Wageningen, The Netherlands.
authors.forename: Johannes M
authors.initials: JM
authors.lastname: Baveco
mesh_terms: D000818:Animals; D002683:Chironomidae / Q000187:drug effects* / Q000254:growth & development; D004390:Chlorpyrifos / Q000633:toxicity*; D019015:Geologic Sediments; D007306:Insecticides / Q000633:toxicity*; D007814:Larva / Q000187:drug effects; D008954:Models, Biological
chemical_list: D007306:Insecticides; D004390:Chlorpyrifos
keywords: Chironomus riparius; Chlorpyrifos; Ingestion; Population model; Sediment exposure