The Role of Iron and Anthropogenic Activities in Eutrophication: A Contemporary and Paleolimnological Study

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Title: The Role of Iron and Anthropogenic Activities in Eutrophication: A Contemporary and Paleolimnological Study
Authors: Varin, Marie-Pierre
Date: 2016
Abstract: In this study, I examined water chemistry of 31 Canadian Shield lakes in relation to catchment characteristics to test the hypothesis that Shield lakes with more marble may exhibit iron (Fe) deficiency and, hence, be more vulnerable to eutrophication. I performed a diatom-based paleolimnological reconstruction of one of these lakes (Heney Lake), which was subjected to anthropogenic stresses including a fish farm. Results suggest that the presence of marble influenced lake chemistry, including lowering the ratio of Fe: P. The reconstruction of historical P concentrations was not statistically possible but past Fe could be inferred, which no previous study has attempted. Certain eutrophication-associated diatom species suggest that logging and European settlement beginning in the early XXth century led to a slight increase in nutrient concentrations. However, a more important diatom species shift was likely related to climate change, as observed in other temperate lakes worldwide.
URL: http://hdl.handle.net/10393/34618
http://dx.doi.org/10.20381/ruor-5804
CollectionThèses, 2011 - // Theses, 2011 -
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