Mercury Trends in Predatory Fish in Great Slave Lake: The Influence of Temperature and Other Climate Drivers
Identifieur interne : 000169 ( Main/Exploration ); précédent : 000168; suivant : 000170Mercury Trends in Predatory Fish in Great Slave Lake: The Influence of Temperature and Other Climate Drivers
Auteurs : Marlene Evans [Canada] ; Derek Muir [Canada] ; Robert B. Brua [Canada] ; Jonathan Keating [Canada] ; XIAOWA WANG [Canada]Source :
- Environmental science & technology [ 0013-936X ] ; 2013.
Descripteurs français
- Pascal (Inist)
- Wicri :
English descriptors
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Abstract
Here we report on trends in mercury (Hg) concentrations in lake trout (Salvelinus namaycush), burbot (Lota lota), and northern pike (Esox lucius) from Great Slave Lake, located in the Mackenzie River Basin (MRB) and investigate how climate factors may be influencing these trends. Hg concentrations in lake trout and burbot increased significantly over the early 1990s to 2012 in the two major regions of the lake; no trend was evident for northern pike over 1999-2012. Temporal variations in Hg concentrations in lake trout and burbot were similar with respect to timing of peaks and troughs. Inclusion of climate variables based on annual means, particularly temperature, improved explanatory power for variations in Hg over analyses based only on year and fish length; unexpectedly, the temperature coefficient was negative. Climate analyses based on growing season means (defined as May-September) had less explanatory power suggesting that trends were more strongly associated with colder months within the year. Inclusion of the Pacific/North American index improved explanatory power for the lake trout model suggesting that trends may have been affected by air circulation patterns. Overall, while our study confirmed previously reported trends of Hg increase in burbot in the MRB, we found no evidence that these trends were directly driven by increasing temperatures and productivity.
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Brua</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Watershed Hydrology and Ecology Research Division, Environment Canada</s1><s2>Saskatoon, Saskatchewan S7N 3H5</s2><s3>CAN</s3><sZ>3 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Saskatoon, Saskatchewan S7N 3H5</wicri:noRegion></affiliation></author><author><name sortKey="Keating, Jonathan" sort="Keating, Jonathan" uniqKey="Keating J" first="Jonathan" last="Keating">Jonathan Keating</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Aquatic Contaminants Research Division, Environment Canada</s1><s2>Saskatoon, Saskatchewan S7N 3H5</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Saskatoon, Saskatchewan S7N 3H5</wicri:noRegion></affiliation></author><author><name sortKey="Xiaowa Wang" sort="Xiaowa Wang" uniqKey="Xiaowa Wang" last="Xiaowa Wang">XIAOWA WANG</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Aquatic Contaminants Research Division, Environment Canada</s1><s2>Burlington, Ontario L7R 4A6</s2><s3>CAN</s3><sZ>2 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Burlington, Ontario L7R 4A6</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Environmental science & technology</title><title level="j" type="abbreviated">Environ. sci. technol.</title><idno type="ISSN">0013-936X</idno><imprint><date when="2013">2013</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Environmental science & technology</title><title level="j" type="abbreviated">Environ. sci. technol.</title><idno type="ISSN">0013-936X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Chemical contamination</term><term>Climate</term><term>Freshwater environment</term><term>Great Slave Lake</term><term>Mercury</term><term>Pisces</term><term>Predator</term><term>Temperature</term><term>Trend</term><term>Trend analysis</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Mercure</term><term>Analyse tendance</term><term>Tendance</term><term>Prédateur</term><term>Pisces</term><term>Lac Great Slave</term><term>Température</term><term>Climat</term><term>Contamination chimique</term><term>Milieu eau douce</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Mercure</term><term>Climat</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Here we report on trends in mercury (Hg) concentrations in lake trout (Salvelinus namaycush), burbot (Lota lota), and northern pike (Esox lucius) from Great Slave Lake, located in the Mackenzie River Basin (MRB) and investigate how climate factors may be influencing these trends. Hg concentrations in lake trout and burbot increased significantly over the early 1990s to 2012 in the two major regions of the lake; no trend was evident for northern pike over 1999-2012. Temporal variations in Hg concentrations in lake trout and burbot were similar with respect to timing of peaks and troughs. Inclusion of climate variables based on annual means, particularly temperature, improved explanatory power for variations in Hg over analyses based only on year and fish length; unexpectedly, the temperature coefficient was negative. Climate analyses based on growing season means (defined as May-September) had less explanatory power suggesting that trends were more strongly associated with colder months within the year. Inclusion of the Pacific/North American index improved explanatory power for the lake trout model suggesting that trends may have been affected by air circulation patterns. Overall, while our study confirmed previously reported trends of Hg increase in burbot in the MRB, we found no evidence that these trends were directly driven by increasing temperatures and productivity.</div></front></TEI><affiliations><list><country><li>Canada</li></country><region><li>Ontario</li></region><settlement><li>Burlington (Ontario)</li></settlement><orgName><li>Centre canadien des eaux intérieures</li></orgName></list><tree><country name="Canada"><noRegion><name sortKey="Evans, Marlene" sort="Evans, Marlene" uniqKey="Evans M" first="Marlene" last="Evans">Marlene Evans</name></noRegion><name sortKey="Brua, Robert B" sort="Brua, Robert B" uniqKey="Brua R" first="Robert B." last="Brua">Robert B. Brua</name><name sortKey="Keating, Jonathan" sort="Keating, Jonathan" uniqKey="Keating J" first="Jonathan" last="Keating">Jonathan Keating</name><name sortKey="Muir, Derek" sort="Muir, Derek" uniqKey="Muir D" first="Derek" last="Muir">Derek Muir</name><name sortKey="Xiaowa Wang" sort="Xiaowa Wang" uniqKey="Xiaowa Wang" last="Xiaowa Wang">XIAOWA WANG</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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