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This graph depicts the
total phosphorus concentration at Site 1 throughout the summer, at the
surface, mid-depth and bottom of the lake.
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An increasing trend can
also be seen in the bottom samples, which contained significantly higher
levels of phosphorus than either surface or mid-depth samples.
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Phosphorus levels peaked in
the bottom samples at 401 ppb.
The greater phosphorus concentration in bottom samples can be
explained by sediment release and strong stratification of the lake during
the summer.
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