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Dams and River Ecosystems

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Questions and Answers

How do dams impact river ecosystems?

Dams improve habitat by trapping important food and habitat features behind them.

Dams have no impact on river ecosystems.

Dams alter habitat and negatively affect the creation and maintenance of complex habitat downstream. (correct)

Dams help in maintaining consistent temperature and water quality in river ecosystems.

What is a negative impact of slow-moving or still reservoirs formed by dams?

Enhanced fish migration due to the formation of reservoirs.

Improved water quality due to reduced flow in the reservoirs.

Abnormal temperature fluctuations and algal blooms due to heating up of reservoirs. (correct)

Decreased oxygen levels due to excessive cooling of reservoirs.

How do dams affect fish migration?

Dams increase fish population by providing protected areas.

Dams prevent fish migration, limiting their ability to access spawning habitat and food resources. (correct)

Dams facilitate fish migration by creating new pathways.

Dams have no impact on fish migration.

What is a consequence of dams altering river flows?

Impacts on the ability of sensitive species due to abnormal temperature fluctuations. Signup and view all the answers

How do dams impact the creation and maintenance of complex habitat downstream?

Dams trap important food and habitat features, negatively affecting the creation and maintenance of complex habitat downstream. Signup and view all the answers

What is a fish ladder also known as?

Fishway Signup and view all the answers

How do fish move through a fish ladder?

By swimming against a stream of water and leaping through rushing water Signup and view all the answers

What is the function of a fish elevator?

Attract fish to a chamber filled with water at the downstream side and transport them over to the upstream side Signup and view all the answers

How does a bypass channel function?

Wholly circumvents the barrier and resembles a side channel Signup and view all the answers

What is the purpose of a bypass channel?

To allow fish passage and high river flows to spill over the barrier Signup and view all the answers