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Dissolved Oxygen
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Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

Dec 18, 2015

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Rodger Bennett
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Page 1: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

Dissolved Oxygen

Page 2: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

Dissolved Oxygen• The presence of

oxygen gas molecules (O2) in the water.

• It’s important for aquatic animals and plants during respiration.

• Important to note that the oxygen in H2O is not dissolved oxygen.

What’s coming out of the diffuser?

Page 3: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

Dissolved Oxygen in the River System

• Oxygen enters a river by diffusion from the surrounding air and during the process of photosynthesis

Page 4: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

Fast moving water dissolves more oxygen than still water

Page 6: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

Water at higher

altitudes holds less

oxygen than water at lower

altitudes.

Why?

Page 7: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

Solubility of Gases in Water

• The amount of a gas that can dissolve in a liquid is affected by both the temperature and the pressure.

Page 8: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

How Does Dissolved Oxygen Affect the Ecosystem?

• Dissolved oxygen is critical for many of the biological and chemical processes in the river.

• It is necessary for respiration, decomposition, converting nutrients to useful forms, and converting chemicals to less harmful forms.

Page 9: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

DO and the River Ecosystem

• All aquatic animals have some mechanism for taking in DO.

• Gills and skin are the two most common structures used for acquiring oxygen into the organism.

Page 10: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

Different Organisms Require Different Amounts of DO

• Trout and salmon require high amounts of dissolved oxygen

• Carp and catfish can survive with much less.

Page 11: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

How do Humans Affect the Amount of DO in the Water?

• Addition of oxygen-consuming organic wastes

Page 12: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

Addition of Nutrients

Page 13: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

Changing the Flow of the Water

Which dam is this?

The Croton Dam

Page 14: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

Activities That Raise the Water Temperature and

Decrease D.O.

Page 15: Dissolved Oxygen The presence of oxygen gas molecules (O 2 ) in the water. It’s important for aquatic animals and plants during respiration. Important.

How is Dissolved Oxygen Measured?

• Dissolved oxygen is measured in mg/L (ppm) or % saturation.

• Explain saturated, unsaturated and supersaturated

Would the time of day affect the amount of DO in the water? Why?