How does human intervention affect
the amount of dissolved oxygen that is present in water?
create many conditions that alter the amount of DO in a body of
water. Some of them have little effect, while others have
produced disastrous effects on water quality or fish populations.
Human intervention comes in the form of dams, human waste, fertilizer
and agricultural waste.
Dams slow the
flow of water, reducing the amount of aeration and increasing the
temperature. In many places these changes will not create
bad effects. However, in other places fish populations are
hurt because the dissolved oxygen levels drop below what a fish
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