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
Identifieur interne : 000548 ( Main/Exploration ); précédent : 000547; suivant : 000549Temporal 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
Auteurs : Nikolaus Gantner [Canada] ; Michael Power [Canada] ; John A. Babaluk [Canada] ; James D. Reist [Canada] ; Günter Köck [Autriche] ; Lyle W. Lockhart [Canada] ; Keith R. Solomon [Canada] ; Derek Cg. Muir [Canada]Source :
- Environmental Toxicology and Chemistry [ 0730-7268 ] ; 2009-02.
Descripteurs français
English descriptors
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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°50′N, 70°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 (δ15N) 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 δ15N signatures (>12‰) had larger Hg concentrations (0.09–1.63 μg/g wet wt) than small char with smaller δ15N signatures (<12‰, 0.03–0.32 μg/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 δ15N, leading to less within‐year variability and a more consistent temporal trend. The δ15N‐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.
Url:
DOI: 10.1897/08-054.1
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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°50′N, 70°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 (δ15N) 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 δ15N signatures (>12‰) had larger Hg concentrations (0.09–1.63 μg/g wet wt) than small char with smaller δ15N signatures (<12‰, 0.03–0.32 μg/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 δ15N, leading to less within‐year variability and a more consistent temporal trend. The δ15N‐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.</div></front></TEI><affiliations><list><country><li>Autriche</li><li>Canada</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Gantner, Nikolaus" sort="Gantner, Nikolaus" uniqKey="Gantner N" first="Nikolaus" last="Gantner">Nikolaus Gantner</name></noRegion><name sortKey="Babaluk, John A" sort="Babaluk, John A" uniqKey="Babaluk J" first="John A." last="Babaluk">John A. Babaluk</name><name sortKey="Lockhart, Lyle W" sort="Lockhart, Lyle W" uniqKey="Lockhart L" first="Lyle W." last="Lockhart">Lyle W. Lockhart</name><name sortKey="Muir, Derek Cg" sort="Muir, Derek Cg" uniqKey="Muir D" first="Derek Cg." last="Muir">Derek Cg. Muir</name><name sortKey="Power, Michael" sort="Power, Michael" uniqKey="Power M" first="Michael" last="Power">Michael Power</name><name sortKey="Reist, James D" sort="Reist, James D" uniqKey="Reist J" first="James D." last="Reist">James D. Reist</name><name sortKey="Solomon, Keith R" sort="Solomon, Keith R" uniqKey="Solomon K" first="Keith R." last="Solomon">Keith R. Solomon</name></country><country name="Autriche"><noRegion><name sortKey="Kock, Gunter" sort="Kock, Gunter" uniqKey="Kock G" first="Günter" last="Köck">Günter Köck</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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