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Questions and Answers
What effect does an increase in temperature have on biological activity in aquatic environments?
What effect does an increase in temperature have on biological activity in aquatic environments?
- Biological activity is only influenced by dissolved oxygen levels.
- Biological activity decreases significantly.
- Biological activity remains constant regardless of temperature.
- Biological activity doubles with every 10°C increase. (correct)
How does temperature affect the solubility of gases in water?
How does temperature affect the solubility of gases in water?
- Solubility of gases decreases with temperature. (correct)
- Temperature has no effect on gas solubility.
- Only some gases are affected by temperature changes.
- Solubility of gases increases with temperature.
What issue can arise from the presence of algae mats in water bodies?
What issue can arise from the presence of algae mats in water bodies?
- They promote faster decomposition of organic matter.
- They enhance the growth of all aquatic species.
- They cause taste and odor problems. (correct)
- They increase oxygen levels in the water.
Which type of fish requires cooler temperatures and higher levels of dissolved oxygen?
Which type of fish requires cooler temperatures and higher levels of dissolved oxygen?
What are important chemical parameters related to the solvent capabilities of water?
What are important chemical parameters related to the solvent capabilities of water?
Flashcards
Lower Temperatures
Lower Temperatures
Slower biological activity, essential nutrients available, organisms efficient at food utilization flourish.
Temperature Increase (10°C)
Temperature Increase (10°C)
Doubles biological activity, some species decline or are eliminated.
Algae Mats
Algae Mats
Natural oils and decaying algae cause taste/odor problems in water.
Higher-order species
Higher-order species
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Temperature Changes
Temperature Changes
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Solubility of Gases
Solubility of Gases
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Dissolved Oxygen
Dissolved Oxygen
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Chemical Water Quality Parameters
Chemical Water Quality Parameters
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Universal Solvent
Universal Solvent
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Total Dissolved Solids
Total Dissolved Solids
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Alkalinity
Alkalinity
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Study Notes
Environmental Chemistry
- Lower temperatures slow biological activity, but essential nutrients are still required to favor faster biological activity. A 10°C increase approximately doubles biological activity.
- Increased metabolic rates in some organisms (ex: reproduction and growth), while others decline and potentially die off.
- Algal growth can be accelerated in warm water, forming dense mats that can impact water quality
- Natural secretions from algae, and their decomposition cause issues such as unpleasant taste and smells.
- Higher-order organisms (like fish) are significantly impacted by temperature and dissolved oxygen levels. These levels depend on temperature.
- Fish generally prefer cooler temperatures and higher dissolved oxygen levels.
- Temperature changes affect chemical reaction rates and solubility. Solid dissolution increases with temperature; gas solubility decreases.
- Increased temperature lowers dissolved oxygen; inhibiting the biological oxidation of organics in streams.
- Water's solvent properties greatly affect chemical parameters including total dissolved solids and alkalinity.
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