Quiz 8.3 &8.5

What is eutrophication?

• A process where a body of water is enriched in nutrients

• A decrease in water temperature

• An increase in fish population

• A reduction in water clarity

What causes an algal bloom in eutrophic environments?

• Decrease in water temperature

• Decrease in sunlight

• Increase in nutrients

• Increase in fish population

What happens when an algal bloom dies?

• Fish population increases

• Microbes digest the algae and oxygen

• Nutrient levels decrease

• Water temperature rises

What is a consequence of decreased dissolved oxygen in water?

• Large die-offs of fish

• Increased water clarity

• Increase in algae

• Higher water temperature

What are hypoxic waterways?

• Bodies of water high in nutrients

• Bodies of water low in dissolved oxygen

• Bodies of water with high fish populations

• Bodies of water with stable algae populations

How do oligotrophic waterways compare to eutrophic waterways?

• They have very low amounts of nutrients

• They have unstable algae populations

• They have high amounts of nutrients

• They have low dissolved oxygen

What is a characteristic of oligotrophic waterways?

• High nutrient levels

• Low water clarity

• High dissolved oxygen

• Frequent algal blooms

What is an anthropogenic cause of eutrophication?

• Agricultural runoff

• Natural weathering of rocks

• Volcanic eruptions

• Earthquakes

What is another anthropogenic cause of eutrophication?

• Wastewater release

• Forest fires

• Tidal waves

• Glacial melting

What are endocrine disruptors?

• Fish that adapt to low oxygen

• Nutrients that enhance plant growth

• Chemicals that interfere with the endocrine system

• Microbes that digest algae