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MeHg accumulated in the hypolimnion of Lake 240 when oxygen was present.
For the higher concentrations of nitrate and oxygen in the hypolimnion during weeks 15 to 25, another mechanism might be efficacious.
The mean acoustic size of rising bubbles decreased in the hypolimnion but increased in the epilimnion.
Both ponds are dystrophic, surrounded by extensive mats of Sphagnum, and stratified in summer with anoxic hypolimnia .
These lakes have permanent thermoclines, small littoral zones, and deep hypolimnia .
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