Influence of Carbon and Lipid Sources on Variation of Mercury And Other Trace Elements in Polar Bears (Ursus Maritimus)
In the present study, the authors investigated the influence of carbon and lipid sources on regional differences in liver trace element (As, Cd, Cu, total Hg, Mn, Pb, Rb, Se, and Zn) concentrations measured in polar bears (Ursus maritimus) (n=121) from 10 Alaskan, Canadian Arctic, and East Greenland...
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ftunivnebraskali:oai:digitalcommons.unl.edu:usfwspubs-1384 2023-11-12T04:13:31+01:00 Influence of Carbon and Lipid Sources on Variation of Mercury And Other Trace Elements in Polar Bears (Ursus Maritimus) Routti, Heli Letcher, Robert J. Born, Erik W. Branigan, Marsha Dietz, Rune Evans, Thomas J. Mckinney, Melissa A. Peacock, Elizabeth Sonne, Christian 2012-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/usfwspubs/385 https://digitalcommons.unl.edu/context/usfwspubs/article/1384/viewcontent/Routti_ETC_2012_INFLUENCE_OF_CARBON_AND_LIPID_SOURCES.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/usfwspubs/385 https://digitalcommons.unl.edu/context/usfwspubs/article/1384/viewcontent/Routti_ETC_2012_INFLUENCE_OF_CARBON_AND_LIPID_SOURCES.pdf US Fish & Wildlife Publications Polar bear Mercury Trace elements Spatial trends Carbon and lipid sources text 2012 ftunivnebraskali 2023-10-30T09:48:45Z In the present study, the authors investigated the influence of carbon and lipid sources on regional differences in liver trace element (As, Cd, Cu, total Hg, Mn, Pb, Rb, Se, and Zn) concentrations measured in polar bears (Ursus maritimus) (n=121) from 10 Alaskan, Canadian Arctic, and East Greenland subpopulations. Carbon and lipid sources were assessed using δ13C in muscle tissue and fatty acid (FA) profiles in subcutaneous adipose tissue as chemical tracers. A negative relationship between total Hg and δ13C suggested that polar bears feeding in areas with higher riverine inputs of terrestrial carbon accumulate more Hg than bears feeding in areas with lower freshwater input. Mercury concentrations were also positively related to the FA 20:1n-9, which is biosynthesized in large amounts in Calanus copepods. This result raises the hypothesis that Calanus glacialis are an important link in the uptake of Hg in the marine food web and ultimately in polar bears. Unadjusted total Hg, Se, and As concentrations showed greater geographical variation among polar bear subpopulations compared with concentrations adjusted for carbon and lipid sources. The Hg concentrations adjusted for carbon and lipid sources in Bering–Chukchi Sea polar bear liver tissue remained the lowest among subpopulations. Based on these findings, the authors suggest that carbon and lipid sources for polar bears should be taken into account when one is assessing spatial and temporal trends of long-range transported trace elements. Text Arctic Calanus glacialis Chukchi Chukchi Sea East Greenland Greenland Ursus maritimus Copepods University of Nebraska-Lincoln: DigitalCommons@UNL Arctic Chukchi Sea Greenland |
institution |
Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
Polar bear Mercury Trace elements Spatial trends Carbon and lipid sources |
spellingShingle |
Polar bear Mercury Trace elements Spatial trends Carbon and lipid sources Routti, Heli Letcher, Robert J. Born, Erik W. Branigan, Marsha Dietz, Rune Evans, Thomas J. Mckinney, Melissa A. Peacock, Elizabeth Sonne, Christian Influence of Carbon and Lipid Sources on Variation of Mercury And Other Trace Elements in Polar Bears (Ursus Maritimus) |
topic_facet |
Polar bear Mercury Trace elements Spatial trends Carbon and lipid sources |
description |
In the present study, the authors investigated the influence of carbon and lipid sources on regional differences in liver trace element (As, Cd, Cu, total Hg, Mn, Pb, Rb, Se, and Zn) concentrations measured in polar bears (Ursus maritimus) (n=121) from 10 Alaskan, Canadian Arctic, and East Greenland subpopulations. Carbon and lipid sources were assessed using δ13C in muscle tissue and fatty acid (FA) profiles in subcutaneous adipose tissue as chemical tracers. A negative relationship between total Hg and δ13C suggested that polar bears feeding in areas with higher riverine inputs of terrestrial carbon accumulate more Hg than bears feeding in areas with lower freshwater input. Mercury concentrations were also positively related to the FA 20:1n-9, which is biosynthesized in large amounts in Calanus copepods. This result raises the hypothesis that Calanus glacialis are an important link in the uptake of Hg in the marine food web and ultimately in polar bears. Unadjusted total Hg, Se, and As concentrations showed greater geographical variation among polar bear subpopulations compared with concentrations adjusted for carbon and lipid sources. The Hg concentrations adjusted for carbon and lipid sources in Bering–Chukchi Sea polar bear liver tissue remained the lowest among subpopulations. Based on these findings, the authors suggest that carbon and lipid sources for polar bears should be taken into account when one is assessing spatial and temporal trends of long-range transported trace elements. |
format |
Text |
author |
Routti, Heli Letcher, Robert J. Born, Erik W. Branigan, Marsha Dietz, Rune Evans, Thomas J. Mckinney, Melissa A. Peacock, Elizabeth Sonne, Christian |
author_facet |
Routti, Heli Letcher, Robert J. Born, Erik W. Branigan, Marsha Dietz, Rune Evans, Thomas J. Mckinney, Melissa A. Peacock, Elizabeth Sonne, Christian |
author_sort |
Routti, Heli |
title |
Influence of Carbon and Lipid Sources on Variation of Mercury And Other Trace Elements in Polar Bears (Ursus Maritimus) |
title_short |
Influence of Carbon and Lipid Sources on Variation of Mercury And Other Trace Elements in Polar Bears (Ursus Maritimus) |
title_full |
Influence of Carbon and Lipid Sources on Variation of Mercury And Other Trace Elements in Polar Bears (Ursus Maritimus) |
title_fullStr |
Influence of Carbon and Lipid Sources on Variation of Mercury And Other Trace Elements in Polar Bears (Ursus Maritimus) |
title_full_unstemmed |
Influence of Carbon and Lipid Sources on Variation of Mercury And Other Trace Elements in Polar Bears (Ursus Maritimus) |
title_sort |
influence of carbon and lipid sources on variation of mercury and other trace elements in polar bears (ursus maritimus) |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2012 |
url |
https://digitalcommons.unl.edu/usfwspubs/385 https://digitalcommons.unl.edu/context/usfwspubs/article/1384/viewcontent/Routti_ETC_2012_INFLUENCE_OF_CARBON_AND_LIPID_SOURCES.pdf |
geographic |
Arctic Chukchi Sea Greenland |
geographic_facet |
Arctic Chukchi Sea Greenland |
genre |
Arctic Calanus glacialis Chukchi Chukchi Sea East Greenland Greenland Ursus maritimus Copepods |
genre_facet |
Arctic Calanus glacialis Chukchi Chukchi Sea East Greenland Greenland Ursus maritimus Copepods |
op_source |
US Fish & Wildlife Publications |
op_relation |
https://digitalcommons.unl.edu/usfwspubs/385 https://digitalcommons.unl.edu/context/usfwspubs/article/1384/viewcontent/Routti_ETC_2012_INFLUENCE_OF_CARBON_AND_LIPID_SOURCES.pdf |
_version_ |
1782331474158026752 |