Zobrazeno 1 - 10
of 149
pro vyhledávání: '"W.L. Lockhart"'
Publikováno v:
Aquatic Ecosystem Health & Management. 9:307-318
Lake Winnipeg supports the largest commercial fishery on Canadian Prairies. It has been influenced by a variety of environmental forces and anthropogenic activities. To gain a better understanding of recent changes in nutrient status of the lake, it
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a212dc273208888f48ebca30b93b5dfe
https://doi.org/10.1080/14634980600876039
https://doi.org/10.1080/14634980600876039
Autor:
Rudolf Wagemann, W.L. Lockhart, R.E.A. Stewart, Gary A. Stern, B. Dunn, Lois A. Harwood, R. V. Hunt, C.K. Hyatt, J. DeLaronde, D.A. Metner, K. Mount
Publikováno v:
Science of The Total Environment. :391-412
Beluga whales have been hunted for food by Native People in the Canadian Arctic since prehistoric time. Here we report the results of analyses of total mercury in samples of liver, kidney, muscle and muktuk from collections over the period 1981–200
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7eca6f168de66e9c892471e040427d2e
https://doi.org/10.1016/j.scitotenv.2005.01.050
https://doi.org/10.1016/j.scitotenv.2005.01.050
Autor:
Gail Boila, S. Stephenson, Karen A. Kidd, Marlene S. Evans, S. Atkins, N. DeGraff, G. Low, S. Friesen, B. N. Billeck, M. Stoddart, B. Grey, W.L. Lockhart, Gary A. Stern, G. Stephens, J. DeLaronde, N. Snowshoe, S. Thompson, Pat Roach, S. Harbicht, Derek C. G. Muir, M.R. Hendzel
Publikováno v:
Science of The Total Environment. :427-463
Subsistence fishing has been an important source of food for Native People in northern Canada since prehistoric time. Measurements of the levels of mercury in edible muscle of northern fish have been undertaken for over three decades in efforts to ev
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c776bb7ddf337fdaa298eb40234a1d19
https://doi.org/10.1016/j.scitotenv.2004.11.027
https://doi.org/10.1016/j.scitotenv.2004.11.027
Autor:
W.L. Lockhart, P. B. Hamilton, Jeanne B. Percival, Gary A. Stern, Roger McNeely, Peter M. Outridge
Publikováno v:
Geochimica et Cosmochimica Acta. 69:4881-4894
Varved (annually-laminated) sediments offer a rare and physically undisturbed archive of past trace metal deposition and limnological conditions. Here, a high-resolution 1,300 year record of metal accumulation is presented from a varved lake sediment
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10e5dbe7a86f9a8b811f8f2171db4ee9
https://doi.org/10.1016/j.gca.2005.06.009
https://doi.org/10.1016/j.gca.2005.06.009
Autor:
E. Braekevelt, Gary A. Stern, Terry F. Bidleman, Gregg T. Tomy, Bruno Rosenberg, W.L. Lockhart, Peter M. Outridge, Paul A. Helm, P. B. Hamilton, R. McNeeley, P Wilkinson, Michael G. Ikonomou
Publikováno v:
Science of The Total Environment. 342:223-243
Two annually laminated cores collected from Lake DV09 on Devon Island in May 1999 were dated using 210Pb and 137Cs, and analyzed for a variety of halogenated organic contaminants (HOCs), including polychlorinated biphenyls (PCBs), organochlorine pest
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca4213e5f2bef774dfba2b3fd365f66c
https://doi.org/10.1016/j.scitotenv.2004.12.046
https://doi.org/10.1016/j.scitotenv.2004.12.046
Autor:
R. G. Semkin, Julian T. Hoff, Tom Harner, Sean Backus, Leonard A. Barrie, Liisa M. Jantunen, Mark B. Yunker, Crispin J. Halsall, John N. Smith, Kenneth J. Reimer, Janusz A. Pudykiewicz, Dennis Gregor, W.H. Schroeder, R. Wagemann, L.B. Alexeeva, Frank Wania, Gary A. Stern, Derek C. G. Muir, Donald Mackay, Charles Gobeil, Miriam L. Diamond, J.M. Bewers, W.L. Lockhart, Robie W. Macdonald, Yi-Fan Li, R. Bailey, William M. J. Strachan, Mehran Alaee, Terry F. Bidleman
Publikováno v:
Science of The Total Environment. 254:93-234
Recent studies of contaminants under the Canadian Northern Contaminants Program (NCP) have substantially enhanced our understanding of the pathways by which contaminants enter Canada’s Arctic and move through terrestrial and marine ecosystems there
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28b64fc1a141a2fd2d7767b821051e28
https://doi.org/10.1016/s0048-9697(00)00434-4
https://doi.org/10.1016/s0048-9697(00)00434-4
Publikováno v:
Environmental Science & Technology. 33:2858-2863
Sediment cores from six lakes in Canada ranging from 49°N to 81°N were analyzed for C10−C13 polychlorinated n-alkanes (PCAs) with the intent of (i) examining the depositional trends with increasing latitude, (ii) studying the historical profiles
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f358dd01107cc0bd9105134393eaea69
https://doi.org/10.1021/es990107q
https://doi.org/10.1021/es990107q
Publikováno v:
The Science of The Total Environment. 218:19-31
Concentrations of methylmercury, total mercury and selenium in marine mammal tissues were determined in liver, muscle, skin (muktuk) and blubber of belugas, ringed seals and narwhal, using atomic absorption and capillary gas chromatography with ECD d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20aa930ed0e036c0a80a578f2e736333
https://doi.org/10.1016/s0048-9697(98)00192-2
https://doi.org/10.1016/s0048-9697(98)00192-2
Autor:
C. Gubala, W.L. Lockhart, Marc Lucotte, K. Johansson, T. Vlasova, Matti Verta, Dixon H. Landers
Publikováno v:
Atmospheric Environment. 32:919-928
Anthropogenically elevated Hg deposition in arctic and subarctic ecosystems is potentially a serious environmental problem, particularly in northern Europe and North America. To determine the magnitude of this concern, it is necessary to make an eval
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c5050411e68bca5a86f50233be8c7049
https://doi.org/10.1016/s1352-2310(97)00116-7
https://doi.org/10.1016/s1352-2310(97)00116-7
Autor:
J.B DeLaronde, R.A. Danell, R. V. Hunt, Paul Wilkinson, V. St. Louis, Gregg J. Brunskill, W.L. Lockhart, B.N. Billeck
Publikováno v:
Biogeochemistry. 40:163-173
Sediment cores were collected from lakes in central and northern Canada and from Hudson Bay to compare current and historic net depositions of mercury. Cores from most locations were enriched in mercury in the upper layers deposited recently relative
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d5ab65cd5bed03a48aaf0a971eb67b78
https://doi.org/10.1023/a:1005923123637
https://doi.org/10.1023/a:1005923123637