Research Topics
| H WolkersSummaryAffiliation: Norwegian Polar Institute Country: Norway Publications
| Collaborators
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Detail Information
Publications
Modeling biomagnification and metabolism of contaminants in harp seals of the Barents SeaAlison J Fraser
Canadian Environmental Modelling Centre, Trent University, Peterborough, Ontario
Environ Toxicol Chem 21:55-61. 2002....- Accumulation and transfer of contaminants in killer whales (Orcinus orca) from Norway: indications for contaminant metabolismHans Wolkers
Norwegian Polar Institute, N 9296 Tromsø, Norway
Environ Toxicol Chem 26:1582-90. 2007..Polychlorinated biphenyls, chlordanes, and dichlorodiphenyldichloro-ethylene (DDE) accumulate to some degree in killer whales, although toxaphenes and PBDEs might be partly broken down... 
Organochlorine-induced histopathology in kidney and liver tissue from Arctic fox (Vulpes lagopus)Christian Sonne
Section for Contaminants, Effects and Marine Mammals, Department of Arctic Environment, National Environmental Research Institute, University of Aarhus, Frederiksborgvej 399, PO Box 358, DK 4000 Roskilde, Denmark
Chemosphere 71:1214-24. 2008..Whether such lesions may have an impact on age and health of the animals remains uncertain...- Tissue-specific contaminant accumulation and associated effects on hepatic serum analytes and cytochrome P450 enzyme activities in hooded seals (Cystophora cristata) from the Gulf of St. LawrenceHans Wolkers
Norwegian Polar Institute, Polar Environmental Centre, Hjalmar Johansensgt 14, 9296 Tromsø, Norway
Arch Environ Contam Toxicol 56:360-70. 2009..Therefore, liver CYP isoenzymes may serve as a sensitive biomarker for long-term exposure to polyhalogenated hydrocarbons... - Accumulation, metabolism, and food-chain transfer of chlorinated and brominated contaminants in subadult white whales (Delphinapterus leucas) and narwhals (Monodon monoceros) from Svalbard, NorwayH Wolkers
Norwegian Polar Institute, Tromsø, N 9296, Norway
Arch Environ Contam Toxicol 50:69-78. 2006..The high levels and broad pattern of accumulating pollutants make white whales and narwhals excellent indicators for a wide range of contaminants in the Arctic... - Congener-specific accumulation and patterns of chlorinated and brominated contaminants in adult male walruses from Svalbard, Norway: indications for individual-specific prey selectionHans Wolkers
Norwegian Polar Institute, N 9296 Tromsø, Norway
Sci Total Environ 370:70-9. 2006..This suggestion was reinforced by the fatty acid profiles of the inner blubber layer of walruses with low versus high contaminant levels, which suggested different diets for the two groups... - Congener-specific accumulation and food chain transfer of polybrominated diphenyl ethers in two arctic food chainsHans Wolkers
Norwegian Polar Institute, N 9296 Tromsø, Norway
Environ Sci Technol 38:1667-74. 2004..Polar bears are seemingly capable of metabolizing virtually all PBDEs and are therefore unsuitable as indicators for PBDE contamination in the environment... - Accumulation and lactational transfer of PCBs and pesticides in harbor seals (Phoca vitulina) from Svalbard, NorwayHans Wolkers
Norwegian Polar Institute, N 9296 Tromso, Norway
Sci Total Environ 319:137-46. 2004..The similar contaminant pattern in milk and pups suggested that they are probably unable to metabolize contaminants and consequently, accumulate all ingested chemicals... - Biomarker responses and decreasing contaminant levels in ringed seals (Pusa hispida) from Svalbard, NorwayHans Wolkers
Norwegian Polar Institute, Tromsø, Norway
J Toxicol Environ Health A 71:1009-18. 2008..9%)between EROD activity and percent blubber indicates that CYP might respond to increased bioavailability of the contaminant mixtures when they are mobilized from blubber during periods of reduced food intake... - Transfer of polychlorinated biphenyls and chlorinated pesticides from mother to pup in relation to cytochrome P450 enzyme activities in harp seals (Phoca groenlandica) from the gulf of St. Lawrence, CanadaHans Wolkers
Akvaplan niva, Tromsø, Norway
Environ Toxicol Chem 21:94-101. 2002..The CYP450 enzyme activities were considered unsuitable indicators for contaminant mobilization and transfer in harp seals... - Tissue-specific accumulation and lactational transfer of polychlorinated biphenyls, chlorinated pesticides, and brominated flame retardants in hooded seals (Cistophora cristata) from the Gulf of St. Lawrence: applications for monitoringHans Wolkers
Norwegian Polar Institute, Polar Environmental Centre, N 9296 Tromsø, Norway
Environ Pollut 142:476-86. 2006..This might be caused by their low blubber, and thus contaminant, loss during lactation compared to other species... - Bioaccumulation of radiocaesium in Arctic sealsJolynn Carroll
Akvaplan niva AS, Polar Environmental Centre, 9296 Tromsø, Norway
Mar Pollut Bull 44:1366-71. 2002..The application of this work to Arctic monitoring and assessment programs is discussed... - Contaminants in Svalbard polar bear samples archived since 1967 and possible population level effectsAndrew E Derocher
Norwegian Polar Institute, N-9296 Tromso, Norway
Sci Total Environ 301:163-74. 2003.... - Bioaccumulation of PCBs in Arctic seabirds: influence of dietary exposure and congener biotransformationKatrine Borgå
Norwegian Polar Institute, N 9296 Tromsø, Norway
Environ Pollut 134:397-409. 2005.... - Blood is a poor substrate for monitoring pollution burdens in phocid sealsChristian Lydersen
Norwegian Polar Institute, Tromsø
Sci Total Environ 292:193-203. 2002.... - Organotins in marine mammals and seabirds from Norwegian territoryJohn Arthur Berge
Norwegian Institute for Water Research, PO Box 173, Kjelsås N 0411 Oslo, Norway
J Environ Monit 6:108-12. 2004..The limited data available indicate low to moderate exposure to organotins in northern areas (Spitsbergen and Bear Island). Marine mammals are however more exposed further south along the Norwegian Coast...