Human Influence on Ocean Systems

Review the graph showing marine fishing rates.If the fishing rate in Asia continues to grow, what will most likely happen as a result?

• The fish population will continue to rise.

• A wide range in ocean temperatures will be seen worldwide.

• The U.S. human population will decline.

• The overfishing will cause an imbalance in marine ecosystems.

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What happens when a fertilizer runoff happens?

• Algae grow rapidly.

• Fish get bigger.

• The water becomes very clear.

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A coastal area that once supported a thriving fishing industry is overfished. The number of species found living in the marine ecosystem decreases. Which of these activities is most likely to INCREASE the natural biodiversity in the area?

• building artificial reefs and limiting fishing activity

• introducing invasive species to fill unoccupied habitats and banning fishing

• building artificial reefs and increasing fishing activity

• eliminating invasive species and encouraging fishing for large predatory fish

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The graph below shows how the number of species in a particular ecosystem changed over a 200 year period. What is one conclusion you can make based on the information in the graph?

• The number of species increased the most during the first 50 years

• The number of species decreased by 25,0000 over a period of 200 years

• The number of species decresed the most durin gthe last 80 years

• The number of species increased by 25,000 over a period of 200 years.

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An artificial reef is a man made structure that may mimic some of the characteristics of a natural reef.

• True

• False

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What is one way humans are trying to positively impact the ocean?

• Fishing

• Drilling for oil and natural gas

• Creating artificial reefs

• Transporting goods in ocean vessels

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How do the oceans contribute to the amount of Oxygen in the Earth's atmosphere?

• Fish in the ocean produce oxygen.

• Phytoplankton in the ocean produce oxygen through the process of respiration.

• Phytoplankton in the ocean produce oxygen through the process of phtosynthesis.

• There is no oxygen production in the ocean.

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Which of the following is NOT a source of pollution in the ocean?

• Fertilizers used on land.

• Sand drifting along the bottom of the ocean floor.

• Oils found on city streets.

• Emissions from gas-burning vehicles.

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Which process is responsible for carrying fertilizers that have been applied to crops into bodies of water, such as a river?

• Runoff

• Evaporation

• Ocean Currents

• Tectonic Plate Movement

What do we depend on the ocean for?

• Food

• Oxygen

• Transportation

• All of the above

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