Abstract
ABSTRACT Oxygen demand and anoxic factor values were calculated for Garner Lake, a 96-ha reservoir in Shelby County, Tennessee during 1994 and 1995. This physically unique reservoir of the West Tennessee Plain physiographic region has a mean depth of 5.5 m and very high total phosphorus concentrations (concentrations often above 100 μg · L−1 and a maximum value of 1510 (μg · L−1). Areal hypolimnetic oxygen deficit (AHOD) values were 234 and 182 mg · m−2 · day−1, and anoxic factors (AF) were 17.7 and 13.0 days · year−1 in 1994 and 1995, respectively. AHOD and AF values predicted from phosphorus and lake morphometry are much higher than observed values. Several causes could explain Garner Lake's lower than expected AHOD and AF values: 1) it is a southern reservoir and may function differently from more northern, dimictic lakes upon which the models are based, 2) it had been fertilized in 1993.
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