Temporal trends of organochlorine contaminants in burbot and lake trout from three selected Yukon lakes
Identifieur interne : 000971 ( Main/Exploration ); précédent : 000970; suivant : 000972Temporal trends of organochlorine contaminants in burbot and lake trout from three selected Yukon lakes
Auteurs : M. J. Ryan [Canada] ; G. A. Stern [Canada] ; M. Diamond [Canada] ; M. V. Croft [Canada] ; P. Roach [Canada] ; K. Kidd [Canada]Source :
- Science of the total environment [ 0048-9697 ] ; 2005.
Descripteurs français
- KwdFr :
- Animaux (MeSH), Eau douce (MeSH), Facteurs temps (MeSH), Foie (composition chimique), Gadiformes (MeSH), Hydrocarbures chlorés (analyse), Lipides (analyse), Muscles (composition chimique), Poids (MeSH), Polluants chimiques de l'eau (analyse), Surveillance de l'environnement (MeSH), Territoire du Yukon (MeSH), Truite (MeSH).
- MESH :
- analyse : Hydrocarbures chlorés, Lipides, Polluants chimiques de l'eau.
- composition chimique : Foie, Muscles.
- Pascal (Inist)
- Wicri :
English descriptors
- KwdEn :
- Animals (MeSH), Arctic Region, Body Weight (MeSH), Canada, Chlorine Organic compounds, Contaminant, Environmental Monitoring (MeSH), Fresh Water (MeSH), Freshwater environment, Gadiformes (MeSH), Hydrocarbons, Chlorinated (analysis), Lakes, Lipids (analysis), Liver (chemistry), Lota lota, Muscles (chemistry), Organochlorine compounds, Pollution, Surface water, Time Factors (MeSH), Trend analysis, Trout (MeSH), Water Pollutants, Chemical (analysis), Water pollution, Yukon Territory (MeSH).
- MESH :
- chemical , analysis : Hydrocarbons, Chlorinated, Lipids, Water Pollutants, Chemical.
- geographic : Yukon Territory.
- chemistry : Liver, Muscles.
- Animals, Body Weight, Environmental Monitoring, Fresh Water, Gadiformes, Time Factors, Trout.
Abstract
Historical studies have demonstrated that organochlorine (OC) concentrations in top predators can vary considerably from lake to lake within a small geographic region but temporal trends of these contaminants have rarely been monitored in a sub-Arctic area for a long period of time. This study examined OC concentrations, including chlordane (CHL), DDT, hexachlorocyclohexane (HCH), toxaphene (CHB), PCB and chlorinated benzenes (CBz) in lake trout and burbot, from three Yukon lakes (Laberge, Kusawa, Quiet), over a span of 11 years (1992-2003). Temporal and spatial differences continue to exist in the OC concentrations of burbot and lake trout between these lakes. There is strong evidence that these contaminants are declining at various rates in lake trout (Salveninus namaycush) in Laberge, Kusawa and Quiet Lakes. For example, SDDT concentrations have decreased 39%, 85% and 84% in Kusawa, Quiet and Laberge Lakes, respectively. Conversely, no consistent trends were observed in OC concentrations for burbot (Lota lota). For example, there is no evidence of a decline in toxaphene concentrations of Kusawa burbot yet a 58% decrease was observed in Laberge samples. Increases were also observed in the SHCH levels of Kusawa Lake burbot, as well as increases in all OC groups (except XHCH) for the Quiet Lake burbot samples. Decreases in burbot were evident in XHCH and ΣCHB for Lake Laberge fish and in ΣCHL for Kusawa Lake samples. Spatial variations in OC levels are quite evident as Lake Laberge trout and burbot continued to maintain the highest levels over the eleven-year period from 1992 to 2003 followed by Kusawa Lake and then Quiet Lake. These differences were related to a variety of factors especially the species morphological characteristics such as log age, log weights and fish lipid content. A decreasing trend in Quiet and Laberge Lake trout lipid content, coupled with fluctuating condition factors and increases in body masses, suggest biotic changes may be occurring within the food webs due to fish population variations related to the cessation of commercial fishing or potentially an increase in lake plankton productivity related to annual climate variation. It is suspected that biotic factors rather than atmospheric inputs are the primary factors affecting the contaminant concentrations in lake trout and burbot in the study lakes.
Affiliations:
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Le document en format XML
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<series><title level="j" type="main">Science of the total environment</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Animals (MeSH)</term>
<term>Arctic Region</term>
<term>Body Weight (MeSH)</term>
<term>Canada</term>
<term>Chlorine Organic compounds</term>
<term>Contaminant</term>
<term>Environmental Monitoring (MeSH)</term>
<term>Fresh Water (MeSH)</term>
<term>Freshwater environment</term>
<term>Gadiformes (MeSH)</term>
<term>Hydrocarbons, Chlorinated (analysis)</term>
<term>Lakes</term>
<term>Lipids (analysis)</term>
<term>Liver (chemistry)</term>
<term>Lota lota</term>
<term>Muscles (chemistry)</term>
<term>Organochlorine compounds</term>
<term>Pollution</term>
<term>Surface water</term>
<term>Time Factors (MeSH)</term>
<term>Trend analysis</term>
<term>Trout (MeSH)</term>
<term>Water Pollutants, Chemical (analysis)</term>
<term>Water pollution</term>
<term>Yukon Territory (MeSH)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Animaux (MeSH)</term>
<term>Eau douce (MeSH)</term>
<term>Facteurs temps (MeSH)</term>
<term>Foie (composition chimique)</term>
<term>Gadiformes (MeSH)</term>
<term>Hydrocarbures chlorés (analyse)</term>
<term>Lipides (analyse)</term>
<term>Muscles (composition chimique)</term>
<term>Poids (MeSH)</term>
<term>Polluants chimiques de l'eau (analyse)</term>
<term>Surveillance de l'environnement (MeSH)</term>
<term>Territoire du Yukon (MeSH)</term>
<term>Truite (MeSH)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Hydrocarbons, Chlorinated</term>
<term>Lipids</term>
<term>Water Pollutants, Chemical</term>
</keywords>
<keywords scheme="MESH" type="geographic" xml:lang="en"><term>Yukon Territory</term>
</keywords>
<keywords scheme="MESH" qualifier="analyse" xml:lang="fr"><term>Hydrocarbures chlorés</term>
<term>Lipides</term>
<term>Polluants chimiques de l'eau</term>
</keywords>
<keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Liver</term>
<term>Muscles</term>
</keywords>
<keywords scheme="MESH" qualifier="composition chimique" xml:lang="fr"><term>Foie</term>
<term>Muscles</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Animals</term>
<term>Body Weight</term>
<term>Environmental Monitoring</term>
<term>Fresh Water</term>
<term>Gadiformes</term>
<term>Time Factors</term>
<term>Trout</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Analyse tendance</term>
<term>Animaux</term>
<term>Eau douce</term>
<term>Facteurs temps</term>
<term>Gadiformes</term>
<term>Organochloré</term>
<term>Poids</term>
<term>Pollution</term>
<term>Contaminant</term>
<term>Lac</term>
<term>Arctique</term>
<term>Milieu eau douce</term>
<term>Pollution eau</term>
<term>Chlore Composé organique</term>
<term>Eau surface</term>
<term>Lota lota</term>
<term>Canada</term>
<term>Surveillance de l'environnement</term>
<term>Territoire du Yukon</term>
<term>Truite</term>
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<keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Canada</term>
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<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Pollution</term>
<term>Lac</term>
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<front><div type="abstract" xml:lang="en">Historical studies have demonstrated that organochlorine (OC) concentrations in top predators can vary considerably from lake to lake within a small geographic region but temporal trends of these contaminants have rarely been monitored in a sub-Arctic area for a long period of time. This study examined OC concentrations, including chlordane (CHL), DDT, hexachlorocyclohexane (HCH), toxaphene (CHB), PCB and chlorinated benzenes (CBz) in lake trout and burbot, from three Yukon lakes (Laberge, Kusawa, Quiet), over a span of 11 years (1992-2003). Temporal and spatial differences continue to exist in the OC concentrations of burbot and lake trout between these lakes. There is strong evidence that these contaminants are declining at various rates in lake trout (Salveninus namaycush) in Laberge, Kusawa and Quiet Lakes. For example, SDDT concentrations have decreased 39%, 85% and 84% in Kusawa, Quiet and Laberge Lakes, respectively. Conversely, no consistent trends were observed in OC concentrations for burbot (Lota lota). For example, there is no evidence of a decline in toxaphene concentrations of Kusawa burbot yet a 58% decrease was observed in Laberge samples. Increases were also observed in the SHCH levels of Kusawa Lake burbot, as well as increases in all OC groups (except XHCH) for the Quiet Lake burbot samples. Decreases in burbot were evident in XHCH and ΣCHB for Lake Laberge fish and in ΣCHL for Kusawa Lake samples. Spatial variations in OC levels are quite evident as Lake Laberge trout and burbot continued to maintain the highest levels over the eleven-year period from 1992 to 2003 followed by Kusawa Lake and then Quiet Lake. These differences were related to a variety of factors especially the species morphological characteristics such as log age, log weights and fish lipid content. A decreasing trend in Quiet and Laberge Lake trout lipid content, coupled with fluctuating condition factors and increases in body masses, suggest biotic changes may be occurring within the food webs due to fish population variations related to the cessation of commercial fishing or potentially an increase in lake plankton productivity related to annual climate variation. It is suspected that biotic factors rather than atmospheric inputs are the primary factors affecting the contaminant concentrations in lake trout and burbot in the study lakes.</div>
</front>
</TEI>
<affiliations><list><country><li>Canada</li>
</country>
<region><li>Ontario</li>
</region>
<settlement><li>Toronto</li>
</settlement>
<orgName><li>Université de Toronto</li>
</orgName>
</list>
<tree><country name="Canada"><noRegion><name sortKey="Ryan, M J" sort="Ryan, M J" uniqKey="Ryan M" first="M. J." last="Ryan">M. J. Ryan</name>
</noRegion>
<name sortKey="Croft, M V" sort="Croft, M V" uniqKey="Croft M" first="M. V." last="Croft">M. V. Croft</name>
<name sortKey="Diamond, M" sort="Diamond, M" uniqKey="Diamond M" first="M." last="Diamond">M. Diamond</name>
<name sortKey="Kidd, K" sort="Kidd, K" uniqKey="Kidd K" first="K." last="Kidd">K. Kidd</name>
<name sortKey="Roach, P" sort="Roach, P" uniqKey="Roach P" first="P." last="Roach">P. Roach</name>
<name sortKey="Stern, G A" sort="Stern, G A" uniqKey="Stern G" first="G. A." last="Stern">G. A. Stern</name>
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</record>
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