Environmental Contaminants in Colonial Waterbirds from Great Slave Lake, NWT: Spatial, Temporal and Food-chain Considerations
ABSTRACT. Great Slave Lake in the Northwest Territories, Canada, differs regionally in trophic status and local and regional inputs of contaminants. Spatial and temporal trends in contaminant levels in bioindicator species such as colonial waterbirds could offer insights into the potential for conta...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.535.8757 2023-05-15T14:19:48+02:00 Environmental Contaminants in Colonial Waterbirds from Great Slave Lake, NWT: Spatial, Temporal and Food-chain Considerations Keith A. Hobson Jacques Sirois The Pennsylvania State University CiteSeerX Archives 2000 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.535.8757 http://pubs.aina.ucalgary.ca/arctic/Arctic53-3-221.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.535.8757 http://pubs.aina.ucalgary.ca/arctic/Arctic53-3-221.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.aina.ucalgary.ca/arctic/Arctic53-3-221.pdf text 2000 ftciteseerx 2016-01-08T10:48:57Z ABSTRACT. Great Slave Lake in the Northwest Territories, Canada, differs regionally in trophic status and local and regional inputs of contaminants. Spatial and temporal trends in contaminant levels in bioindicator species such as colonial waterbirds could offer insights into the potential for contaminant bioaccumulation in Great Slave Lake. Persistent chlorinated hydrocarbon contaminants, mercury (Hg), and selenium (Se) were examined in herring gull (Larus argentatus) eggs and livers collected from various locations on Great Slave Lake in 1995. Eggs were collected in May and June, and livers in May and August. Also, the relationship between contaminants and trophic level, as inferred from stable-nitrogen isotope analysis (δ15N), was examined in four colonial waterbird species: herring gull, mew gull (L. canus), Caspian tern (Sterna caspia), and black tern (Chlidonias niger). Finally, the co-accumulation of mercury and selenium was examined in eggs of these birds. There were no differences in chlorinated hydrocarbon concentrations among four sampling sites (colonies). Concentrations did not differ between herring gull adults collected in early May and those collected in early August. Chlorinated hydrocarbon concentrations in eggs of herring gull, mew gull, Caspian tern, and black tern were related to their trophic positions as inferred from their δ15N values in their lipid-free egg yolks. Concentrations in these colonial waterbirds were much higher than those in fish from Great Slave Lake, but lower than those in their conspecifics from the Great Lakes. It is probable that a relatively large proportion of the chlorinated hydrocarbon contaminant load in colonial waterbird eggs on Great Slave Lake results from exposure to and storage of such contaminants at more heavily contaminated wintering and staging areas. This possibility limits the usefulness of colonial waterbirds as indicators Text Arctic Great Slave Lake Northwest Territories Unknown Canada Great Slave Lake ENVELOPE(-114.001,-114.001,61.500,61.500) Northwest Territories |
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Open Polar |
collection |
Unknown |
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ftciteseerx |
language |
English |
description |
ABSTRACT. Great Slave Lake in the Northwest Territories, Canada, differs regionally in trophic status and local and regional inputs of contaminants. Spatial and temporal trends in contaminant levels in bioindicator species such as colonial waterbirds could offer insights into the potential for contaminant bioaccumulation in Great Slave Lake. Persistent chlorinated hydrocarbon contaminants, mercury (Hg), and selenium (Se) were examined in herring gull (Larus argentatus) eggs and livers collected from various locations on Great Slave Lake in 1995. Eggs were collected in May and June, and livers in May and August. Also, the relationship between contaminants and trophic level, as inferred from stable-nitrogen isotope analysis (δ15N), was examined in four colonial waterbird species: herring gull, mew gull (L. canus), Caspian tern (Sterna caspia), and black tern (Chlidonias niger). Finally, the co-accumulation of mercury and selenium was examined in eggs of these birds. There were no differences in chlorinated hydrocarbon concentrations among four sampling sites (colonies). Concentrations did not differ between herring gull adults collected in early May and those collected in early August. Chlorinated hydrocarbon concentrations in eggs of herring gull, mew gull, Caspian tern, and black tern were related to their trophic positions as inferred from their δ15N values in their lipid-free egg yolks. Concentrations in these colonial waterbirds were much higher than those in fish from Great Slave Lake, but lower than those in their conspecifics from the Great Lakes. It is probable that a relatively large proportion of the chlorinated hydrocarbon contaminant load in colonial waterbird eggs on Great Slave Lake results from exposure to and storage of such contaminants at more heavily contaminated wintering and staging areas. This possibility limits the usefulness of colonial waterbirds as indicators |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Keith A. Hobson Jacques Sirois |
spellingShingle |
Keith A. Hobson Jacques Sirois Environmental Contaminants in Colonial Waterbirds from Great Slave Lake, NWT: Spatial, Temporal and Food-chain Considerations |
author_facet |
Keith A. Hobson Jacques Sirois |
author_sort |
Keith A. Hobson |
title |
Environmental Contaminants in Colonial Waterbirds from Great Slave Lake, NWT: Spatial, Temporal and Food-chain Considerations |
title_short |
Environmental Contaminants in Colonial Waterbirds from Great Slave Lake, NWT: Spatial, Temporal and Food-chain Considerations |
title_full |
Environmental Contaminants in Colonial Waterbirds from Great Slave Lake, NWT: Spatial, Temporal and Food-chain Considerations |
title_fullStr |
Environmental Contaminants in Colonial Waterbirds from Great Slave Lake, NWT: Spatial, Temporal and Food-chain Considerations |
title_full_unstemmed |
Environmental Contaminants in Colonial Waterbirds from Great Slave Lake, NWT: Spatial, Temporal and Food-chain Considerations |
title_sort |
environmental contaminants in colonial waterbirds from great slave lake, nwt: spatial, temporal and food-chain considerations |
publishDate |
2000 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.535.8757 http://pubs.aina.ucalgary.ca/arctic/Arctic53-3-221.pdf |
long_lat |
ENVELOPE(-114.001,-114.001,61.500,61.500) |
geographic |
Canada Great Slave Lake Northwest Territories |
geographic_facet |
Canada Great Slave Lake Northwest Territories |
genre |
Arctic Great Slave Lake Northwest Territories |
genre_facet |
Arctic Great Slave Lake Northwest Territories |
op_source |
http://pubs.aina.ucalgary.ca/arctic/Arctic53-3-221.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.535.8757 http://pubs.aina.ucalgary.ca/arctic/Arctic53-3-221.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766291523493691392 |