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Inter-species differences for polychlorinated biphenyls and polybrominated diphenyl ethers in marine top predators from the Southern North Sea: Part 2. Biomagnification in harbour seals and harbour porpoises |
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| Authors: | Weijs Liesbeth Dirtu Alin C Das Krishna Gheorghe Adriana Reijnders Peter J H Neels Hugo Blust Ronny Covaci Adrian |
| Institution: | a Laboratory of Ecophysiology, Biochemistry and Toxicology, Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium b Toxicological Centre, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium c Department of Inorganic and Analytical Chemistry, ”Al.I.Cuza” University of Iassy, Carol I Bvd. No 11, 700506 Iassy, Romania d Laboratory for Oceanology- MARE Center, University of Liège B6C, 4000 Liège, Belgium e Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, Soseaua Panduri 90-92, 050663 Bucharest, Romania f Institute for Marine Resources and Ecosystem Studies, Dept. Ecology, PO Box 167, 1790 AD Den Burg, The Netherlands g Toxicological Centre, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium |
| Abstract: | Harbour porpoises (Phocoena phocoena) and harbour seals (Phoca vitulina) were found to differ in the ability to metabolize polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs). Biomagnification factors (BMFs), calculated between both predators and their prey (sole - Solea solea and whiting - Merlangius merlangus), had a large range of variation (between 0.5 and 91 for PCBs and between 0.6 and 53 for PBDEs). For the higher chlorinated PCBs and the highest brominated PBDEs, the BMF values in adult males were significantly higher than in the juvenile individuals of both species. BMF values of hexa- to octa-PCBs were the highest, suggesting reduced ability to degrade these congeners. Harbour porpoises had higher BMFs for lower chlorinated PCBs and for all PBDEs compared to harbour seals. Other factors, which may influence biomagnification, such as the octanol-water partition coefficients and the trophic level position measured through stable isotope (δ15N) analysis, were found to be of lesser importance to predict biomagnification in the studied food chain. |
| Keywords: | PCBs PBDEs Biomagnification Trophic position Octanol-water partition coefficients Marine mammals |
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