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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

What factors cause the seasonal overturns in lakes?

Summary Introduction

To review:

The reason behind the seasonal overturns in lakes.

Introduction:

The lakes in the temperate region undergo seasonal overturns, which change the amount of oxygen and nutrients in the same. The flow of water also gets affected by this seasonal overturn, which is called ‘thermal stratification’.

Explanation

The temperate region experiences various seasons, like summer, winter, and spring. The change in temperature causes unequal cooling and/or warming of the layers of a water body. For example, in winters, the top layer freezes, while the lower ones remain in the liquid state. This restricts the movement of oxygen from the atmosphere to the lower layers and of the nutrients to the upper layers.

The water freezes at 4°C (degrees Celsius) when the top layer of the water comes in contact with the cold winds...

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