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There are a
couple of Lake Biology concepts that will be used though out our
presentation and should be explained
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*Lake turnover
is caused principally by seasonal temperature changes of a lake's surface
water.
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*(Diagram)
During the summer months, the lake stratifies, forming three distinct
layers. The upper most layer,
also known as the epilimnion, consists of warm oxygenated water. The bottom layer, also known as the
hypolimnion, consists of colder water containing less oxygen because it
trapped at the bottom where oxygen is being used by fish and decomposers.
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*Turnover
occurs in the spring when the ice begins to melt again in the fall when
water cools. The surface water
sinks to the bottom causing a mixing of the lake. This results in oxygenation of the hypolimnion and brings
nutrients, such as phosphorus to the surface.
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*Turnover is
often followed by algae blooms because of the phosphorus increase in the
upper layer allows phytoplankton populations to increase dramatically
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