Human Impact Ecology

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

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NGSS.MS-ESS3-4

NGSS.MS-LS1-6

NGSS.MS-LS2-4

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NGSS.MS-LS2-3

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NGSS.MS-ESS3-4

NGSS.MS-ESS3-5

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NGSS.MS-ESS3-4

NGSS.MS-LS2-4

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NGSS.MS-LS2-4

NGSS.MS-LS2-5

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NGSS.MS-LS2-2

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

After the Aswan High Dam was built on the Nile River, the rate of parasitic blood-fluke infection doubled in the human population near the dam. As a result of building the dam, the flow of the Nile changed. This changed the habitat, which resulted in an increase in its population of a certain aquatic snail. The snails, which were infected, released larvae of the fluke. These larvae then infected humans. This situation best illustrates that:

• the influence of humans on a natural system is always negative in the long term

• the influence of humans on a natural system can have unpredictable negative impacts

• human alteration of an ecosystem does not need to be studied to avoid ecological disaster

• human alteration of an ecosystem will cause pollution and loss of finite resources.

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NGSS.MS-ESS3-4

NGSS.MS-LS2-4

The presence of wastes, such as plastic bags and motor oil, in lakes and streams miles away from developed areas suggests that:

• ecosystems are interconnected and human action can alter ecosystem equilibrium.

• recycling programs have failed to conserve biotic resources.

• natural processes can alter ecosystem stability.

• direct harvesting practices have led to irreversible destruction of ecosystems.

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NGSS.MS-ESS3-4