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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

How does the availability of dissolved oxygen vary from the headwaters of a stream to the mouth of a river?

Summary Introduction

To review:

The way in which the dissolved oxygen varies in the headwater of a stream to the river mouth.

Introduction:

The amount of oxygen dissolved in water is called dissolved oxygen (DO). It determines the quality of a water body. The organic matter present diminishes the DO by increasing the biological oxygen demand (BOD) of the water.

Explanation

The BOD is very low in the headwater of a stream, which usually begins or originates from mountains. Thus, the level of DO is quite high at this point. As the water travels passing through valleys and plains, it gathers silt and other organic matter that comes from soil (river banks) and human settlements...

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