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Scavenging amphipods: sentinels for penetration of mercury and persistent organic chemicals into food webs of the deep arctic ocean
Umeå University, Faculty of Science and Technology, Department of Chemistry. Centre for Atmospheric Research Experiments (CARE), Environment Canada, 6248 Eighth Line, Egbert, ON, L0L 1N0, Canada. (Arcum ; EcoChange)
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2013 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 47, no 11, p. 5553-5561Article in journal (Refereed) Published
Abstract [en]

Archived specimens of the scavenging amphipod Eurythenes gryllus, collected from 2075 to 4250 m below the surface on five expeditions to the western and central Arctic Ocean between 1983 and 1998, were analyzed for total mercury (∑Hg), methyl mercury (MeHg), polychlorinated biphenyls (PCBs) and other industrial or byproduct organochlorines (chlorobenzenes, pentachloroanisole, octachlorostyrene), organochlorine pesticides (OCPs), and polybrominated diphenyl ethers (PBDEs). Median ∑Hg concentrations ranged from 70 to 366 ng g(-1) wet weight (ww). MeHg concentrations (3.55 to 23.5 ng g(-1) ww) accounted for 1.7 to 20.1% (median 3.7%) of ∑Hg. ∑Hg and MeHg were positively and significantly correlated with ww (∑Hg r(2) = 0.18, p = 0.0004, n = 63; MeHg r(2) = 0.42, p = 0.0004, n = 25), but not significantly with δ(13)C nor δ(15)N. Median concentrations of total persistent organic pollutants (POPs) ranged from 9750 to 156 000 ng g(-1) lipid weight, with order of abundance: ∑TOX (chlorobornanes quantified as technical toxaphene) > ∑PCBs > ∑DDTs > ∑chlordanes > ∑mirex compounds > ∑BDEs ∼ ∑chlorobenzenes ∼ octachlorostyrene > α-hexachlorocyclohexane ∼ hexachlorobenzene ∼ pentachloroanisole. Enantioselective accumulation was found for the chiral OCPs o,p'-DDT, cis- and trans-chlordane, nonachlor MC6 and oxychlordane. Lipid-normalized POPs concentrations were elevated in amphipods with lipid percentages ≤10%, suggesting that utilization of lipids resulted in concentration of POPs in the remaining lipid pool. Multidimensional Scaling (MDS) analysis using log-transformed physiological variables and lipid-normalized organochlorine concentrations distinguished amphipods from the central vs western arctic stations. This distinction was also seen for PCB homologues, whereas profiles of other compound classes were more related to specific stations rather than central-west differences.

Place, publisher, year, edition, pages
Washington: American Chemical Society (ACS), 2013. Vol. 47, no 11, p. 5553-5561
Keywords [en]
polybrominated diphenyl ethers, stable isotope analyses, seals phoca hispida, polychlorinated biphenyls, eurythenes gryllus, organochlorine contaminants, ringed seals, delphinapterus leucas, trophic relationships, northwater polynya
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-73126DOI: 10.1021/es304398jISI: 000320097400008PubMedID: 23627492OAI: oai:DiVA.org:umu-73126DiVA, id: diva2:630456
Available from: 2013-06-19 Created: 2013-06-17 Last updated: 2018-06-08Bibliographically approved

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