CGRG Bibliography of Canadian Geomorphology
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Author : Crowe, A.M.; Schindler, D.W.; Vinebrooke, R.D.; and Wolfe, A.P.
Date : 2006.
Title : Use of paleolimnogy to reveal cultural and climate induced eutrophication trends in a large boreal lake.
Publication : Global Challenges Facing Oceanography and Limnology. ALSO 2006, Meeting of the American Society of Limnology and Oceanography. June 4-9, 2005. Victoria Conference Centre, Victoria, British Columbia.
Issue :
Page(s) :
Abstract
Point and diffuse nutrient sources such as sewage effluent and agricultural runoff are well understood to be potent causes of eutrophication, resulting in significant declines in water quality. In addition, factors such as drought and climate warming which result in decreased water renewal may also contribute to the eutrophication of freshwater bodies. Given that historical urban and agricultural development often temporally coincide, and are superimposed upon by changing climactic regimes, it remains difficult to partition which of several potential contributing factors are resulting in apparent eutrophication trends. To address this question, we collected sediment cores from Lac la Biche, AB, in basins subject to varying sources and concentrations of nutrient loading. We used sedimentary algal pigments, and fossil diatoms and cladocerans as measures of productivity and chemical proxies such as total phosphorus, stable isotopes and biogenic silica to infer nutrient enrichment. We conclude that both sewage effluent and agricultural runoff have been significant contributors to eutrophication but this effect differs spatially throughout the lake. Further analysis of these cores will contribute to the making of effective management decisions.
Bibliography of Canadian Geomorphology