In lakes and ponds of temperate latitudes, the upper and bottom layers of water usually turn over during fall.

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In temperate latitudes, the upper and bottom layers of water in lakes and ponds typically undergo turnover during the fall season. This phenomenon is known as the fall turnover or autumnal overturn. During this process, the water temperature becomes more uniform throughout the water column, and the oxygen and nutrient levels are refreshed.

In Lakes and Ponds of Temperate Latitudes, the Upper and Bottom