John Wiley & Sons, Ltd.

Current use pesticides in seawater and their bioaccumulation in polar bear‐ringed seal food chains of the Canadian Arctic

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The distribution of current use pesticides (CUPs) in seawater, and their trophodynamics were investigated in three Canadian Arctic marine food chains. The greatest ranges of dissolved‐phase concentrations in seawater for each CUP were endosulfan sulfate (ES; dacthal (0.76–15 pg L−1) >chlorpyrifos (pentachloronitrobenzene (α‐endosulfan (0.20–2.3 pg L−1). The majority of the bioaccumulation factors (BAFs, L kg−1, water‐respiring organisms) were greatest in plankton, including chlorothalonil (log BAF = 7.4 ± 7.1, mean ± standard error), chlorpyrifos (log BAF = 6.9 ± 6.7), and α‐endosulfan (log BAF = 6.5 ± 6.0). The largest biomagnification factors (BMFs) were found for dacthal in the capelin:plankton trophic relationship (BMF = 13 ± 5.0), and for β‐endosulfan (BMF = 16 ± 4.9), and α‐endosulfan (BMF = 9.3 ± 2.8) in the polar bear:ringed seal relationship at Barrow and Rae Strait respectively. Concentrations of ES exhibited trophic magnification (increasing concentrations with increasing trophic level) in the poikilothermic portion of the food web (trophic magnification factor =1.4), but all of the CUPs underwent trophic dilution in the marine mammal food web, despite some trophic level‐specific biomagnification, which may be indicative of metabolism of the CUPs in mammals. This article is protected by copyright. All rights reserved

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