Are Recent Watershed Disturbances Associated with Temporal and Spatial Changes in Water Quality of Lake George, New York, USA? |
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Authors: | Bahram Momen Larry W Eichler Charles W Boylen Jonathan P Zehr |
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Institution: | (1) Biology Department and Darrin Fresh Water Institute Rensselaer Polytechnic Institute Troy, New York 12180, USA , US |
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Abstract: | a (Chl a), silica (Si), and chloride (Cl) through the use of proper statistical techniques. Results indicate no statistically significant
changes in the concentrations of TP, Chl a, or Si in the spring or summer from 1981 to 1993. A significant temporal trend of increase in Cl concentration is, however,
detected. This is perhaps the strongest evidence that the development of the Lake George watershed has affected lakewater
chemistry. In spring, the concentrations of TP, Chl a, Si, and Cl, averaged over all 13 years, were higher in the south basin, but differences are not statistically significant
(i.e., P > 0.05). In summer, Si was slightly but significantly lower, and Cl was nonsignificantly higher in the south basin. Significant
interactions between temporal and spatial changes are detected based only on summer values of TP and Chl a, indicating differential trends of change for these two variables in the south and north basins during the last 13 years. |
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Keywords: | : Repeated-measures ANOVA Split-plot design Lakewater chemistry Lake George |
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