<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Evans, Marlene S.</style></author><author><style face="normal" font="default" size="100%">Talbot, André</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Investigations of mercury concentrations in walleye and other fish in the Athabasca River ecosystem with increasing oil sands developments</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Environmental Monitoring</style></secondary-title><short-title><style face="normal" font="default" size="100%">J. Environ. Monit.</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">lake trout (Salvelinus namaycush)</style></keyword><keyword><style  face="normal" font="default" size="100%">lake whitefish (Coregonus clupeaformis)</style></keyword><keyword><style  face="normal" font="default" size="100%">mercury concentrations</style></keyword><keyword><style  face="normal" font="default" size="100%">northern pike (Esox lucius)</style></keyword><keyword><style  face="normal" font="default" size="100%">oil sands</style></keyword><keyword><style  face="normal" font="default" size="100%">walleye (Sander vitreus)</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2012</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">14</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Recent studies have reported an increasing trend of mercury concentrations in walleye (Sander vitreus) from the Athabasca River, north eastern Alberta (Canada); these studies were based on three years of comparison and attributed the mercury increase to expanding oil sands developments in the region. In order to conduct a more comprehensive analysis of mercury trends in fish, we compiled an extensive database for walleye, lake whitefish (Coregonus clupeaformis), northern pike (Esox lucius) and lake trout (Salvelinus namaycush) using all available data obtained from provincial, federal, and industry-funded monitoring and other programs. Evidence for increasing trends in mercury concentrations were examined for each species by location and year also considering fish weight and length. In the immediate oil sands area of the Athabasca River, mercury concentrations decreased (p &lt; 0.001) in walleye and lake whitefish over 1984-2011. In western Lake Athabasca and its delta, mercury concentrations decreased (p &lt; 0.0001) in northern pike (1981-2009) although no trend was evident for walleye (1981-2005) and lake trout (1978-2009). Mercury concentrations in lake trout from Namur Lake, a small lake west of the oil sands area, were higher in 2007 than 2000 (p &lt; 0.0001); it is difficult to ascribe this increase to an oil sands impact because similar increases in mercury concentrations have been observed in lake trout from similar sized lakes in the Northwest Territories. While mercury emissions rates have increased with oil sands development and the landscape become more disturbed, mercury concentrations remained low in water and sediments in the Athabasca River and its tributaries and similar to concentrations observed outside the development areas and in earlier decades. Our fish database was assembled from a series of studies that differed in study purpose, design, and analytical methods. Future monitoring programs investigating mercury trends in fish should be more rigorous in their design. </style></abstract><issue><style face="normal" font="default" size="100%">7</style></issue><custom2><style face="normal" font="default" size="100%">Athabasca River, Lake Athabasca, Athabasca Delta, Namur Lake, </style></custom2><custom3><style face="normal" font="default" size="100%">http://www.worldcat.org/oclc/798145571</style></custom3><custom4><style face="normal" font="default" size="100%">CEMA </style></custom4></record></records></xml>