Biomarker Responses and Decreasing Contaminant Levels in ringed seal
Blubber was analyzed for a wide range of contaminants fromfive subadult and eight adult male ringed seals sampled in 2004,namely, for polychlorinated biphenyls (PCBs), hexachlorobenzene(HCB), toxaphenes, chlordanes, dichlorodiphenyldichloroethylene(DDE), and polybrominated diphenylethers (PBDEs).Con...
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Norwegian Polar Institute
2008
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npolardata:oai:npolar.no:dataset/d4a8dce8-c168-5e15-a210-73c0cfa05e3f |
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npolardata:oai:npolar.no:dataset/d4a8dce8-c168-5e15-a210-73c0cfa05e3f 2024-03-03T22:15:37+00:00 Biomarker Responses and Decreasing Contaminant Levels in ringed seal Kovacs, Kit M. Krafft, Bjørn Wolkers, Hans Helgason, Lisa Bjørnsdatter Lydersen, Christian van Bavel, Bert BEGINDATE: 2004-05-01 ENDDATE: 2004-05-31 ENVELOPE(11.66666667,11.66666667,79.0,79.0) OCEAN, ATLANTIC OCEAN, NORTH ATLANTIC OCEAN, SVALBARD AND JAN MAYEN, Kongsfjorden GEOGRAPHIC REGION, ARCTIC GEOGRAPHIC REGION, POLAR 2008-07-15 http://data.npolar.no/dataset/d4a8dce8-c168-5e15-a210-73c0cfa05e3f unknown Norwegian Polar Institute BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS Dataset 2008 npolardata 2019-02-28T13:03:49Z Blubber was analyzed for a wide range of contaminants fromfive subadult and eight adult male ringed seals sampled in 2004,namely, for polychlorinated biphenyls (PCBs), hexachlorobenzene(HCB), toxaphenes, chlordanes, dichlorodiphenyldichloroethylene(DDE), and polybrominated diphenylethers (PBDEs).Contaminant levels were compared to previously sampled animalsfrom the same area, as well as data from literature for otherarctic wildlife species from a wide variety of locations. Ringedseals sampled in 2004 showed 50–90% lower levels of legacy contaminantssuch as PCBs and chlorinated pesticides compared toanimals sampled in 1996 of similar age (14 subadults and 7 adultmales), indicating that the decline of chlorinated contaminantsobserved during the 1990s in a variety of arctic wildlife species iscontinuing into the 21st century. The results also indicated thatPBDE declined in ringed seals; levels in 2004 were about 70–80%lower than in animals sampled in 1998. This is one of the firstobservations of reduced exposure to these compounds and mightbe a first indication that restrictions of production and use ofthese contaminants have resulted in lower exposures in the Arctic.The PCB pattern shifted toward the less chlorinated (i.e., less persistent)PCBs, especially in adult ringed seals, possibly as a resultof reduced overall contaminant exposures and a consequentlylower cytochrome P-450 (CYP) induction, which results in aslower metabolism of less persistent PCBs. The overall effectwould be relative increases in the lower chlorinated PCBs and arelative decreases in the higher chlorinated PCB. Possibly due tolow exposure and consequent low induction levels, ethoxyresorufinO-deethylation (EROD) activity proved to be a poor biomarkerfor contaminant exposure in ringed seals in the present study. Theclose negative correlation (r2=70.9%)between EROD activity andpercent blubber indicates that CYP might respond to increasedbioavailability of the contaminant mixtures when they are mobilizedfrom blubber during periods of reduced food intake. Dataset Arctic Jan Mayen Kongsfjord* Kongsfjorden North Atlantic ringed seal Svalbard walrus* Norwegian Polar Data Centre Arctic Svalbard Jan Mayen Svalbard ENVELOPE(20.000,20.000,78.000,78.000) ENVELOPE(11.66666667,11.66666667,79.0,79.0) |
institution |
Open Polar |
collection |
Norwegian Polar Data Centre |
op_collection_id |
npolardata |
language |
unknown |
topic |
BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS |
spellingShingle |
BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS Kovacs, Kit M. Krafft, Bjørn Wolkers, Hans Helgason, Lisa Bjørnsdatter Lydersen, Christian van Bavel, Bert Biomarker Responses and Decreasing Contaminant Levels in ringed seal |
topic_facet |
BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS |
description |
Blubber was analyzed for a wide range of contaminants fromfive subadult and eight adult male ringed seals sampled in 2004,namely, for polychlorinated biphenyls (PCBs), hexachlorobenzene(HCB), toxaphenes, chlordanes, dichlorodiphenyldichloroethylene(DDE), and polybrominated diphenylethers (PBDEs).Contaminant levels were compared to previously sampled animalsfrom the same area, as well as data from literature for otherarctic wildlife species from a wide variety of locations. Ringedseals sampled in 2004 showed 50–90% lower levels of legacy contaminantssuch as PCBs and chlorinated pesticides compared toanimals sampled in 1996 of similar age (14 subadults and 7 adultmales), indicating that the decline of chlorinated contaminantsobserved during the 1990s in a variety of arctic wildlife species iscontinuing into the 21st century. The results also indicated thatPBDE declined in ringed seals; levels in 2004 were about 70–80%lower than in animals sampled in 1998. This is one of the firstobservations of reduced exposure to these compounds and mightbe a first indication that restrictions of production and use ofthese contaminants have resulted in lower exposures in the Arctic.The PCB pattern shifted toward the less chlorinated (i.e., less persistent)PCBs, especially in adult ringed seals, possibly as a resultof reduced overall contaminant exposures and a consequentlylower cytochrome P-450 (CYP) induction, which results in aslower metabolism of less persistent PCBs. The overall effectwould be relative increases in the lower chlorinated PCBs and arelative decreases in the higher chlorinated PCB. Possibly due tolow exposure and consequent low induction levels, ethoxyresorufinO-deethylation (EROD) activity proved to be a poor biomarkerfor contaminant exposure in ringed seals in the present study. Theclose negative correlation (r2=70.9%)between EROD activity andpercent blubber indicates that CYP might respond to increasedbioavailability of the contaminant mixtures when they are mobilizedfrom blubber during periods of reduced food intake. |
format |
Dataset |
author |
Kovacs, Kit M. Krafft, Bjørn Wolkers, Hans Helgason, Lisa Bjørnsdatter Lydersen, Christian van Bavel, Bert |
author_facet |
Kovacs, Kit M. Krafft, Bjørn Wolkers, Hans Helgason, Lisa Bjørnsdatter Lydersen, Christian van Bavel, Bert |
author_sort |
Kovacs, Kit M. |
title |
Biomarker Responses and Decreasing Contaminant Levels in ringed seal |
title_short |
Biomarker Responses and Decreasing Contaminant Levels in ringed seal |
title_full |
Biomarker Responses and Decreasing Contaminant Levels in ringed seal |
title_fullStr |
Biomarker Responses and Decreasing Contaminant Levels in ringed seal |
title_full_unstemmed |
Biomarker Responses and Decreasing Contaminant Levels in ringed seal |
title_sort |
biomarker responses and decreasing contaminant levels in ringed seal |
publisher |
Norwegian Polar Institute |
publishDate |
2008 |
url |
http://data.npolar.no/dataset/d4a8dce8-c168-5e15-a210-73c0cfa05e3f |
op_coverage |
BEGINDATE: 2004-05-01 ENDDATE: 2004-05-31 ENVELOPE(11.66666667,11.66666667,79.0,79.0) OCEAN, ATLANTIC OCEAN, NORTH ATLANTIC OCEAN, SVALBARD AND JAN MAYEN, Kongsfjorden GEOGRAPHIC REGION, ARCTIC GEOGRAPHIC REGION, POLAR |
long_lat |
ENVELOPE(20.000,20.000,78.000,78.000) ENVELOPE(11.66666667,11.66666667,79.0,79.0) |
geographic |
Arctic Svalbard Jan Mayen Svalbard |
geographic_facet |
Arctic Svalbard Jan Mayen Svalbard |
genre |
Arctic Jan Mayen Kongsfjord* Kongsfjorden North Atlantic ringed seal Svalbard walrus* |
genre_facet |
Arctic Jan Mayen Kongsfjord* Kongsfjorden North Atlantic ringed seal Svalbard walrus* |
_version_ |
1792545056988594176 |