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Title: Teeth as biomonitors of soft tissue mercury concentrations in beluga, Delphinapterus leucas

Abstract

This paper reports relationships between bulk Hg concentrations in the tooth cementum and soft tissues of free-living beluga (Delphinapterus leucas). Total Hg levels were determined in slivers of cementum using a solid-sample Hg analyzer, a recent advance in Hg analysis that avoids acid predigestion. Tooth Hg concentrations ranged up to about 350 ng/g dry weight and were significantly correlated with Hg levels in kidneys, liver, muscle, and muktuk (skin) and with the age of the animals. The Hg/Se ratio in liver, the organ with the highest Hg concentrations, may have been an important determinant of tooth Hg. At hepatic Hg/Se molar ratios {ge}0.6, tooth Hg increased steeply, suggesting that Hg in teeth may reflect physiologically available Hg that was not bound in the liver and that was circulating in the bloodstream. This Hg/Se ratio was exceeded in most beluga aged {ge}20 years. The results indicate that teeth can be used as biomonitors to reconstruct temporal and geographic trends in the soft tissue Hg concentrations of beluga, provided that the age structures of the different populations are known.

Authors:
; ;
Publication Date:
Research Org.:
Geological Survey of Canada, Ottawa, Ontario (CA)
OSTI Identifier:
20062537
Alternate Identifier(s):
OSTI ID: 20062537
Resource Type:
Journal Article
Journal Name:
Environmental Toxicology and Chemistry
Additional Journal Information:
Journal Volume: 19; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 0730-7268
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 63 RADIATION, THERMAL, AND OTHER ENVIRONMENTAL POLLUTANT EFFECTS ON LIVING ORGANISMS AND BIOLOGICAL MATERIALS; WATER POLLUTION; BIOLOGICAL INDICATORS; CETACEANS; MERCURY; TEETH; BIOLOGICAL ACCUMULATION

Citation Formats

Outridge, P.M., Wagemann, R., and McNeely, R. Teeth as biomonitors of soft tissue mercury concentrations in beluga, Delphinapterus leucas. United States: N. p., 2000. Web. doi:10.1897/1551-5028(2000)019<1517:TABOST>2.3.CO;2.
Outridge, P.M., Wagemann, R., & McNeely, R. Teeth as biomonitors of soft tissue mercury concentrations in beluga, Delphinapterus leucas. United States. doi:10.1897/1551-5028(2000)019<1517:TABOST>2.3.CO;2.
Outridge, P.M., Wagemann, R., and McNeely, R. Thu . "Teeth as biomonitors of soft tissue mercury concentrations in beluga, Delphinapterus leucas". United States. doi:10.1897/1551-5028(2000)019<1517:TABOST>2.3.CO;2.
@article{osti_20062537,
title = {Teeth as biomonitors of soft tissue mercury concentrations in beluga, Delphinapterus leucas},
author = {Outridge, P.M. and Wagemann, R. and McNeely, R.},
abstractNote = {This paper reports relationships between bulk Hg concentrations in the tooth cementum and soft tissues of free-living beluga (Delphinapterus leucas). Total Hg levels were determined in slivers of cementum using a solid-sample Hg analyzer, a recent advance in Hg analysis that avoids acid predigestion. Tooth Hg concentrations ranged up to about 350 ng/g dry weight and were significantly correlated with Hg levels in kidneys, liver, muscle, and muktuk (skin) and with the age of the animals. The Hg/Se ratio in liver, the organ with the highest Hg concentrations, may have been an important determinant of tooth Hg. At hepatic Hg/Se molar ratios {ge}0.6, tooth Hg increased steeply, suggesting that Hg in teeth may reflect physiologically available Hg that was not bound in the liver and that was circulating in the bloodstream. This Hg/Se ratio was exceeded in most beluga aged {ge}20 years. The results indicate that teeth can be used as biomonitors to reconstruct temporal and geographic trends in the soft tissue Hg concentrations of beluga, provided that the age structures of the different populations are known.},
doi = {10.1897/1551-5028(2000)019<1517:TABOST>2.3.CO;2},
journal = {Environmental Toxicology and Chemistry},
issn = {0730-7268},
number = 6,
volume = 19,
place = {United States},
year = {2000},
month = {6}
}