1. The hypolimnion may be much warmer in lakes at warmer latitudes. 2. The lowest zone in the lake is the coldest and is called the hypolimnion . 3. This relieves the downward pressure on the hypolimnion , so cold, dense water flows northward. 4. As the epilimnion gets thicker, it exerts more and more pressure on the denser hypolimnion below. 5. Typically the hypolimnion is the coldest layer of a lake in summer, and the warmest layer during winter. 6. The lake is thus anoxic and has reduced hypolimnion , winter circulation, large phytoplankton and relatively lower animal population. 7. Many soda lakes are strongly anoxic lower layer ( hypolimnion ), without oxygen and often high concentrations of sulfide. 8. The two layers of water, the epilimnion and the hypolimnion , on the other hand, differ in density only slightly. 9. Therefore, the warm top layer, called the epilinmion, tends not to mix with the denser lower layer, the hypolimnion . 10. In deep, temperate lakes, the bottom-most waters of the hypolimnion are typically close to 4 �C throughout the year.
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