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- Title
Reconstructing phosphorus levels using models based on the modern diatom assemblages of 55 lakes in southern Quebec.
- Authors
Tremblay, Roxane; Pienitz, Reinhard; Legendre, Pierre
- Abstract
This study shows how modern diatom assemblages, obtained from the surface sediments of 55 deep and shallow lakes in southern Quebec and representing a gradient in trophic state and specific conductivity, can be used to reconstruct the historical water column concentrations of total phosphorus (TP) over time. Inference models were developed with the aid of regression analyses based on weighted means. The TP models demonstrate statistical performances equal to or superior to TP models developed in the past for other regions in Canada and elsewhere in the world. A reconstruction of TP values, based on fossil diatom assemblages of Lac Nairne (Charlevoix, QC), was conducted. Comparing the TP inferred values with the measured values and those estimated using export coefficients, the reliability of the model was proven. In addition, the comparison of the results obtained from reconstructions performed with two inference models (Quebec and Ontario lakes) also revealed that models predicted TP and not a collinear variable.
- Subjects
AQUATIC biology; FOSSIL diatoms; MARINE sediments; PHOSPHORUS in water; MARINE regression
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2014, Vol 71, Issue 6, p887
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2013-0469