Human Ecological Impact

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

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

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

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

• Nitrogen is not a problem in the Gulf of Mexico.

The diagram below 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 porpoises would probably stay the same because porpoises are far removed from phytoplankton in the food web

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

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Which of the following is associated with dead zones in the ocean?

• A decrease in nitrogen levels.

• An increase in oxygen levels.

• An increase in the number of fish.

• Runoff from fertilizers.

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Logging operations used to use a technique called clear-cutting, in which all of the trees in an area are cut down. What type of water pollution will this most likely lead to?

• Toxic

• Sediment

• Nutrient

• Bacterial

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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A pattern of change after existing ecosystem is destroyed, such as clearing for farming.

• Evolution

• Secondary Succession

• Primary Succession

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What is an example of a disturbance that could bring about secondary succession?

• Humans cut down many trees in a small region

• A volcanic eruption covers a village in lava.

what is the leading cause of deforestation?

• Diseases 

• Housing market

• Agriculture and Farming

• Paper mill

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What are impacts of overgrazing?

• pollution and use of more resources

• loss of biodiversity, loss of native topsoil, desertification

• more people than the infrastructure can support

• creation of heat islands

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What are some consequences of deforestation?

• increased population in cities

• building of more infrastructure

• soil erosion, loss of biodiversity, loss of ability to remove CO2

• more mercury and cyanide released into rivers

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