All Flashcards
How do scientists monitor water quality?
By measuring dissolved oxygen (DO), nutrient levels, and disease-causing organisms/toxins.
Describe the cleanup process of oil spills.
Involves chemical dispersants and controlled burns, which release carbon into the atmosphere.
How does temperature affect dissolved oxygen?
Cooler water holds more dissolved oxygen than warmer water.
What is the relationship between BOD and DO?
High BOD leads to low DO, potentially creating hypoxic or anoxic conditions.
How do indicator species help monitor water quality?
Their presence or absence indicates the health of an ecosystem.
How do moving water and photosynthesis increase DO?
Moving water aerates the water, while photosynthesis releases oxygen.
Why is the Zone of Tolerance important?
It helps determine the ideal conditions for organisms to thrive.
What factors affect the Zone of Tolerance?
Factors like sunlight and pollutant levels.
How does respiration affect DO levels?
Respiration uses up DO, decreasing its concentration in the water.
How do nutrient levels affect water quality?
Excessive nutrients can lead to eutrophication and decreased DO.
What are the effects of high BOD on aquatic life?
Low DO levels can lead to hypoxia or anoxia, harming or killing aquatic organisms.
What are the environmental consequences of oil spills?
Death of wildlife, damage to ecosystems, and harm to fisheries.
How does fertilizer runoff impact aquatic ecosystems?
It increases nutrient levels, potentially leading to eutrophication and decreased DO.
What is the effect of the Deepwater Horizon oil spill on the Gulf of Mexico?
Killed wildlife, damaged fisheries, and negatively impacted tourism.
What are the effects of the Exxon Valdez oil spill?
Oiled coastlines, killed animals, and hurt the local economy.