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Communication at the NABS Annual meeting, Keystone, 2000
(335) DETERMINING LIMITING NUTRIENTS IN LAKE EUCHA TRIBUTARIES.
V. Keyworth1, D.E. Storm1, R. Lynch2, D. Altom2, B.E. Haggard1, and M. Matlock3. 1Oklahoma State University, 2Oklahoma University, 3Texas A&M University
Lake Eucha, located in northeast Oklahoma, is a major drinking water source for
the city of Tulsa. Recently, there have been taste and odor problems in Tulsa’s
drinking water due to accelerated eutrophication. We used the Matlock
Periphytometer (MP) to determine the limiting nutrient(s) and the lotic
ecosystem trophic system index (LETSI) in seven tributaries in the Lake Eucha
basin. The four nutrient treatments that were used are nitrate, phosphate,
nitrate and phosphate, and a control (RO water). LETSI is a ratio of baseline
productivity (control) to the maximum potential productivity (nitrate and
phosphate). The treatments were in a random block design on a floating
apparatus (MP) and placed in the streams for 2 week intervals during the
summer, fall, and winter of 1999-2000. Chlorophyll a, b, and c were measured
to determine the periphyton response to the nutrient enrichments. This study in
combination with other ongoing research will be used to develop a total maximum
daily load (TMDL) for Lake Eucha.
Presented at 4:45 PM on Thursday, June 1, 2000 in Nutrient Dynamics II
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