Long-term changes in the phosphorus loading to and trophic state of the Salton Sea,California |
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Authors: | Dale M Robertson S Geoffrey Schladow G Chris Holdren |
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Institution: | (1) U.S. Geological Survey, 8505 Research Way, Middleton, WI 53562, USA;(2) Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA;(3) Denver Federal Center, Bureau of Reclamation, Denver, CO 80225, USA |
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Abstract: | The Salton Sea (Sea) is a eutrophic to hypereutrophic lake characterized by high nutrient concentrations, low water clarity,
and high biological productivity. Based on dissolved phosphorus (P) and nitrogen (N) concentrations and N:P ratios, P is typically
the limiting nutrient in the Sea and, therefore, should be the primary nutrient of concern when considering management efforts.
Flows in the major tributaries to the Sea have been measured since 1965, whereas total P (TP) concentrations were only measured
intermittently by various agencies since 1968. These data were used to estimate annual P loading from 1965 to 2002. Annual
loads have increased steadily from ∼940,000 kg around 1968 to ∼1,450,000 kg in 2002 (∼55% increase), primarily a result of
increased TP concentrations and loads in the New River. Although the eutrophic condition of the Salton Sea is of great concern,
only limited nutrient data are available for the Sea. It is difficult to determine whether the eutrophic state of the Sea
has degraded or possibly even improved slightly in response to the change in P loading because of variability in the data
and changes in the sampling and analytical methodologies.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
Guest editor: S. H. Hurlbert
The Salton Sea Centennial Symposium. Proceedings of a Symposium Celebrating a Century of Symbiosis Among Agriculture, Wildlife
and People, 1905–2005, held in San Diego, California, USA, March 2005 |
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Keywords: | Load Eutrophication Saline Water quality |
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