NDLI: Temporal trends of mercury, cesium, potassium, selenium, and thallium in Arctic char (Salvelinus alpinus) from Lake Hazen, Nunavut, Canada: effects of trophic position, size, and age.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Gantner, Nikolaus Power, Michael Babaluk, John A. Reist, James D. Köck, Günter Lockhart, Lyle W. Solomon, Keith R. Muir, Derek C. G.
Spatial Coverage	Nunavut
Description	Country affiliation: Canada Author Affiliation: Gantner N ( Department of Environmental Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada.)
Abstract	Arctic char (Salvelinus alpinus L.), the top predator in High Arctic lakes, often is used as a bioindicator of Hg contamination in Arctic aquatic ecosystems. The present study investigated effects of trophic position, size, and age of Arctic char in Lake Hazen, the largest lake in the Canadian High Arctic (81 degrees 50'N, 70 degrees 25'W), on Hg bioaccumulation. In addition, several essential (Se, K) and nonessential elements (Tl, Cs) in char muscle tissue were examined to compare their behavior to that of Hg. Trophic position of Arctic char was identified by stable isotope (delta15N) signature. Temporal trends of Hg from seven sampling campaigns over a 16-year period (1990-2006) were investigated for the overall data and for one trophic class. Concentrations of Hg were not correlated with age but were positively related to fork length and trophic position. Large char with greater delta15N signatures (> 12 per thousand) had larger Hg concentrations (0.09-1.63 microg/g wet wt) than small char with smaller delta15N signatures (< 12 per thousand, 0.03-0.32 microg/g wet wt), indicating that Hg concentrations increased with trophic position. Nonessential Cs and Tl showed relationships to age, length, and trophic position similar to those of Hg, indicating their potential to bioaccumulate and biomagnify. Essential Se and K did not show these relationships. Concentrations of Hg were adjusted using delta15N, leading to less within-year variability and a more consistent temporal trend. The delta15N-adjusted trend showed no decline of Hg in Arctic char from Lake Hazen (1990-2006) in the overall data set and in the small morphotype. Trends for the same period before the adjustment were not significant for the overall data set, but a slight decrease was apparent in the small morphotype. The results confirm the need to consider trophic position and fish size when monitoring temporal trends of Hg, particularly for species with different morphotypes.
File Format	HTM / HTML
ISSN	07307268
Issue Number	2
Volume Number	28
e-ISSN	15528618
Journal	Environmental Toxicology and Chemistry
Language	English
Publisher	Wiley
Publisher Date	2009-02-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Water Pollutants, Chemical Thallium Research Support, Non-u.s. Gov't Age Factors Trout Body Size Discipline Environmental Health Discipline Toxicology Cesium Metabolism Journal Article Nunavut Animals Mass Spectrometry Discipline Chemistry Genetics Fresh Water Mercury Potassium
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis

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