Respuesta :
Answer:
increasing bacterial activity as organic matter decays
Explanation:
that would be your answer
Dissolved oxygen concentrations drop quickly downstream from a point-source input of organic matter into the river due to the breakdown of organic compounds by bacteria.
What is dissolved oxygen?
- The amount of oxygen dissolved in water is known as dissolved oxygen (DO).
- The atmosphere and aquatic vegetation provide oxygen to water bodies. Running water, such as a fast-moving stream, dissolves more oxygen than still water, such as that found in a pond or lake.
Why does DO concentrations drop quickly downstream?
- The river's upstream environment is often cold and harsh, preventing organic life from flourishing.
- However, as you proceed downstream, the riverine environment normally becomes a little calmer, allowing for more oxygen-consuming river life like bacteria, which degrade and absorb oxygen as they are swept downstream producing organic products.
- A high organic content in water decreases the amount of dissolved oxygen in water.
hence the DO is reduced in downstream due to breaking down of bacterial products.
learn more about dissolved oxygen here:
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