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PM11 Wildlife Ecotoxicology
(PM187) Perfluorinated compounds in three free-ranging bottlenose dolphin populations from southeastern U.S. waters.
Houde, Magali1, 2, Bujas, T.2, Balmer, B.3, Wells, R.3, Fair, P.4, Solomon, K.1, Muir, D.1, 2, 1 University of Guelph, Department of Environmental Biology, Guelph, Ontario, Canada2 National Water Research Institute, Environment Canada, Burlington, Ontario, Canada3 Chicago Zoological Society c/o Mote Marine Laboratory, Sarasota, Florida, United States4 Center for Coastal Environmental Health and Biomolecular Research, Charleston, South Carolina, United States
ABSTRACT- Fully fluorinated (perfluorinated) chemicals are emerging contaminants which have been used in numerous industrial and household applications such as stain repellents and food wrapper coatings for more than half a century. Anthropogenic perfluorinated acids are now detected in human and wildlife around the world. Toxicity of perfluorinated acids is known in laboratory animals. Little is known about the fate and distribution of these contaminants in the environment as well as their impacts on wildlife. In this study, these chemicals are assessed in biological samples of free-ranging marine mammals for the first time. This project aims to assess the concentrations of seven perfluorinated compounds, containing between 8 and 14 carbon atoms, in plasma and urine of bottlenose dolphins (Tursiops truncatus) from 3 different populations: Charleston, SC, Indian River Lagoon FL (IRL) and Sarasota Bay, FL (SAR). Biological samples were collected during capture, marking and release of dolphins. Samples were extracted using an ion-pairing method and analyses were conducted with LC/MS/MS. Charleston dolphins were generally more contaminated than other dolphins from Florida. Perfluorooctane sulfonate (PFOS) was the compound detected in greatest concentration in all locations (mean concentration in CHS: 1523±587 ng/g of weight wet, IRL: 1374±1125 ng/g w.w. and SAR 882±566 ng/g w.w.). Perfluorooctane sulphonamide (PFOSA), which can be degraded into PFOS, was also detected in all three populations. Concentrations in Charleston and IRL dolphins seemed to decrease with age as opposed to Sarasota where concentrations of perfluorooctanoic acid (PFOA) and PFOSA significantly increased with age. Different emission sources, habitats, diets or metabolic rates may all be factors influencing these trends. Concentrations were significantly correlated with gender of dolphins for a few compounds (e.g. PFOSA in IRL and SAR, p<0.05) were females exhibited higher concentrations than males. Perfluorinated acids were also detected in urine of dolphins suggesting that the urinary system is a way of elimination for these compounds in small toothed whales.
Key words: free-ranging bottlenose dolphins, perfluorinated compounds
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