Human Impact On Ocean Ecosystems

The diagram shows the relationship between some of the organisms in a marine food web. Which of the following is MOST LIKELY to happen if a large number of phytoplankton are killed from runoff entering the ocean?

• The number of zooplankton would probably increase because they wouldn't have to compete with phytoplankton for food.

• The number of salmon would probably decrease because there would be less food available for zooplankton and herring.

• The number of porpoises would probably stay the same because porpoises are far removed from phytoplankton in the food web.

• The Sun would probably not emit as much energy because there would not be as many phytoplankton in the ocean.

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This graph shows the sources of nitrogen entering the Gulf of Mexico as pollution. What is one conclusion you can make based on the information in the graph?

• Nitrogen is not a problem.

• Corn and soybeans are the only crops associated with nitrogen pollution.

• Most nitrogen pollution found in the Gulf of Mexico comes from farming crops.

• Nitrogen that comes from the atmosphere is more harmful than nitrogen from crops.

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What organisms are the basis of a marine food web?

• Crabs

• Fish

• Phytoplankton

• Zooplankton

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What process is the ocean primarily responsible for in the water cycle?

• Condensation

• Evaporation

• Precipitation

• Transpiration

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How do oceans regulate the climate?

• Ocean waves create winds

• Oceans prevent clouds from forming

• Currents move the atmosphere from place to place

• Currents move water that heats or cools the atmosphere, around the world

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The largest source of pollution in the ocean comes from

• acid rain

• oil spills

• runoff

• wind

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

• Fishing

• Creating artificial reefs

• Harvesting oil and natural gas

• Transporting goods in ocean vessels

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How are phytoplankton similar to small trees?

• Both grow in soil

• Both conduct photosynthesis

• Both are about the same size

• Both are at the top of the food chain

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