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When water loses its dissolved oxygen it will kill off macroinvertebrate that need water rich in oxygen to survive. Also, if water loses its oxygen the metal "cadmium" will be able to dissolve in the water (cadmium cannot dissolve in the presence of oxygen). Cadmium is a poisonous metal that will kill any life in the water.

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Clearing land send small organic matter into water, these micro organisms use all of the oxygen in the water. This can kill off indigenous life, and the water will lose all of its usable oxygen

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Criteria for ambient dissolved oxygen concentration in water.

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Criteria for ambient dissolved oxygen concentration in water.

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For cold water criteria in the early stages, the 7 day mean is 9.5 mg/L

For warm water criteria in the early stages, the 7 day mean is 6.0 mg/L

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Dissolved Oxygen in fresh water is typically measured in Percent Saturation (%) or Parts Per Million (PPT)

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Dissolved Oxygen in fresh water is typically measured in Percent Saturation (%) or Parts Per Million (PPT)

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Water near the bottom of the lake.

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Water near the surface of the lake.

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When dissolved oxygen levels are at a low, auquatic life has a hard time surviving.

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When dissolved oxygen levels are at a low, auquatic life has a hard time surviving.

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Equipment Used to Measure Distilled oxygen

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Equipment Used to Measure Distilled oxygen

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They use field lab meters to measure the levels with a probe at an end of a cable.

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Oxygen enters from the atmosphere and groundwater discharge.

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Oxygen enters from the atmosphere and groundwater discharge.

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Ground water discharge is significant in areas only where ground water is a major aspect of stream flow.

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A process that takes place when the amount of dissolved oxygen in a body of water begins to drop below normal levels. Creatures begin to die off, and it progresses until the "death" of the water body.

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Dissolved oxygen is controlled by temperature in surface water. 

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Dissolved oxygen is controlled by temperature in surface water. 

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It has a daily cycle and a seasonal cycle.
Cold water has more dissolved oxygen and warm water has less.

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Rapid moving tends to have more oxygen inside of the water itself. Stagnant water contains less and is harder for matter to stay.

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Dissolved Oxygen: The measure of how much oxygen is dissolved in water

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Dissolved Oxygen: The measure of how much oxygen is dissolved in water

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It also helps marine life including fish, zooplankton and many more to survive.

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https://water.usgs.gov/edu/dissolvedoxygen.html

http://www.fondriest.com/environmental-measurements/equipment/measuring-water-quality/dissolved-oxygen-sensors-and-methods/#DOE1

water.usgs.gov

http://extension.usu.edu/waterquality/whats-in-your-water/do