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Apportionment of bioavailable phosphorus loads entering Cayuga Lake,New York
Authors:Anthony R Prestigiacomo  Steven W Effler  Rakesh K Gelda  David A Matthews  Martin T Auer  Benjamin E Downer  Anika Kuczynski  M Todd Walter
Institution:1. Upstate Freshwater Institute, Syracuse, New York;2. Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, Michigan;3. School of Civil and Environmental Engineering, Cornell University, Ithaca, New York
Abstract:The integration of the phosphorus (P) bioavailability concept into a P loading analysis for Cayuga Lake, New York, is documented. Components of the analyses included the: (1) monitoring of particulate P (PP), soluble unreactive P (SUP), and soluble reactive P (SRP), supported by biweekly and runoff event‐based sampling of the lake's four largest tributaries; (2) development of relationships between tributary P concentrations and flow; (3) algal bioavailability assays of PP, SUP, and SRP from primary tributaries and the three largest point sources; and (4) development of P loading estimates to apportion contributions according to individual nonpoint and point sources, and to represent the effects of interannual variations in tributary flows on P loads. Tributary SRP, SUP, and PP are demonstrated to be completely, mostly, and less bioavailable, respectively. The highest mean bioavailability for PP was observed for the stream with the highest agriculture land use. Point source contributions to the total bioavailable P load (BAPL) are minor (5%), reflecting the benefit of reductions from recent treatment upgrades. The BAPL represented only about 26% of the total P load, because of the large contribution of the low bioavailable PP component. Most of BAPL (>70%) is received during high flow intervals. Large interannual variations in tributary flow and coupled BAPL will tend to mask future responses to changes in individual inputs.
Keywords:environmental impacts  rivers/streams  point sources  lakes  nutrients  phosphorus  load estimates  bioavailability
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