Spatial trends and bioaccumulation of organochlorine pollutants in marine zooplankton from the Alaskan and Canadian Arctic

Planktonic copepods (Calanus glacialis and C. hyperboreus; n = 37) and water (n = 19) were collected to examine the spatial distribution and bioaccumulation of organochlorine contaminants (OCs) in the Alaskan and Canadian Arctic. The rank order of total OC (∑ OC) group concentrations in Calanus samp...

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Bibliographic Details
Published in:Environmental Toxicology and Chemistry
Main Authors: Hoekstra, Paul F., O'Hara, Todd M., Teixeira, Camilla, Backus, Sean, Fisk, Aaron T., Muir, Derek C.G.
Format: Text
Language:unknown
Published: Scholarship at UWindsor 2002
Subjects:
Biotransformation
Invertebrate
Partitioning
Sea water
Toxaphene
Arctic
Calanus glacialis
Zooplankton
Copepods
Online Access:https://scholar.uwindsor.ca/glierpub/448
https://doi.org/10.1002/etc.5620210316
Description
Summary:Planktonic copepods (Calanus glacialis and C. hyperboreus; n = 37) and water (n = 19) were collected to examine the spatial distribution and bioaccumulation of organochlorine contaminants (OCs) in the Alaskan and Canadian Arctic. The rank order of total OC (∑ OC) group concentrations in Calanus samples was toxaphene ≥ ∑ polychlorinated biphenyls (PCBs) > ∑ hexachlorcyclohexane (HCH) > ∑ DDT > ∑ chlordane-related compounds (CHLOR) > ∑ chlorobenzenes (ClBz). The dominant analyte was α-HCH in all water and zooplankton samples. The most abundant toxaphene congener in water and zooplankton samples was the hexachlorobornane B6-923. Organochlorine contaminant group concentrations in Alaskan zooplankton and water samples were lower than those in samples collected from sites in the eastern Canadian Arctic. Comparison of PCB and toxaphene congener profiles in zooplankton and water samples suggests that biotransformation by cytochrome P-4502B isozymes is low in Calanus, and limited phase I metabolism may occur. The log relationship of bioaccumulation factor (log BAF) versus octanol-water partition coefficient (log KOW) relationship was near 1:1 for OCs within the log KOW range of 3 to 6. A curvilinear model provided a better relationship between these two variables when OC compounds with log KOW > 6 were included. These results suggest that hydrophobic OCs (log KOW 3-6) in Calanus species are at equilibrium with the water concentrations and that physical partitioning, rather than biotransformation, is the major factor governing OC profiles in marine zooplankton.

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