title: Concentrations and trophic magnification of cyclic siloxanes in aquatic biota from the Western Basin of Lake Erie, Canada.
abstract: We examine the concentrations and food web biomagnification of three cyclic volatile methylsiloxanes (cVMS) octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) using aquatic biota collected from Lake Erie. Concentrations of cVMS in biota were within the range reported for other studies of cVMS in aquatic biota. Trophic magnification factors (TMF) were assessed in various food web configurations to investigate the effects of food web structure. TMF estimates were highly dependent on the inclusion/exclusion of the organisms occupying the highest and lowest trophic levels and were >1 for D4 and D5, indicating biomagnification, in only 1 of the 5 food web configurations investigated and were <1 in the remaining 4 food web configurations. TMF estimates for PCB180 were also dependant on food web configuration, but did not correspond with those obtained for cVMS materials. These differences may be attributed to environmental exposure and/or lipid partitioning differences between PCB180 and cVMS.
authors.affiliation: Water Science and Technology Directorate, Environment Canada, Burlington, ON, Canada L7R 4A6. Electronic address: Daryl.McGoldrick@ec.gc.ca.
authors.forename: Daryl J
authors.initials: DJ
authors.lastname: McGoldrick
authors.affiliation: CASSEN Testing Labs, Toronto, ON, Canada M9W 6H3.
authors.forename: Cecilia
authors.initials: C
authors.lastname: Chan
authors.affiliation: Great Lakes Institute for Environmental Research, University of Windsor, Windsor, ON, Canada.
authors.forename: Ken G
authors.initials: KG
authors.lastname: Drouillard
authors.affiliation: Water Science and Technology Directorate, Environment Canada, Burlington, ON, Canada L7R 4A6.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Keir
authors.affiliation: Water Science and Technology Directorate, Environment Canada, Burlington, ON, Canada L7R 4A6.
authors.forename: Mandi G
authors.initials: MG
authors.lastname: Clark
authors.affiliation: Water Science and Technology Directorate, Environment Canada, Burlington, ON, Canada L7R 4A6.
authors.forename: Sean M
authors.initials: SM
authors.lastname: Backus
mesh_terms: D058448:Biota; D002170:Canada; D004784:Environmental Monitoring; D020387:Food Chain; D060106:Lakes / Q000737:chemistry*; D012833:Siloxanes / Q000032:analysis* / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism
chemical_list: D012833:Siloxanes; D014874:Water Pollutants, Chemical; C114768:decamethylcyclopentasiloxane; C024064:octamethylcyclotetrasiloxane; C542115:dodecamethylcyclohexasiloxane
keywords: Biota; Cyclic siloxanes; Great Lakes; Trophic magnification