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What is the connection between organisms in a stream and the dissolved oxygen level?

April 26, 2017connection Dissolved level organisms oxygen stream

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What is the connection between organisms in a stream and the dissolved oxygen level?

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edit: a flowing stream has turbulence which helps aerate the water, increasing dissolved oxygen. In contrast, stagnant water tends to be low in dissolved oxygen, except near the surface. Multicellular animals (like fish) need a good supply of dissolved oxygen to thrive.