Texas Aquatic Science Ch. 8 Streams and Rivers

Which one of the following terms is not considered a part of a stream?

• Riffle

• Run

• Pool

• Basin

What is a key feature of a stream channel?

• Faster, shallow flowing areas characterized with small waves at the surface.

• Deep part of a stream running downhill with the most current.

• Slow flowing deep areas of a stream.

• Fast, turbulent water flow pushing up on obstacles/rocks.

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Why is it important to have plenty of plants growing alongside a stream in the riparian zone?

• acts as a buffer to protest against pollution.

• helps cool the water to increase the dissolved oxygen level.

• the roots help hold the stream bank together to prevent erosion.

• all of the above are true.

The relatively flat land extending outward on both sides of a stream or river is called the _________________________.

• riparian corridor

• stream bank

• floodplain

• river channel

East Texas streams have more diverse aquatic communities (biodiversity) than streams in arid West Texas.

• True

• False

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What is one advantage of having a flood alongside a stream or river?

• changes the path of the stream or river.

• damages property and threatens lives along a river.

• allows fish an opportunity to populate ponds located in a floodplain.

• distributes nutrients throughout the soil of the floodplain which helps grow crops.

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Check on the most common stream fish in Texas.

• minnows

• darters

• walleye

• catfish

• trout

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Which major river in Texas forms our border with Mexico in the south and west and is the 2nd longest river in the US?

• Rio Grande River

• Colorado River

• Red River

• Sabine River

What special adaptation have darters developed in order to live in fast flowing streams?

• Streamlined bodies

• Evolved with no swim bladder and larger pectoral fins

• Stronger dorsal fins and thinner heads

• Bigger gills and camouflaged markings

What do first-order streams have in common with high-order streams/rivers?

• high population of shredders

• low amounts of collectors

• large amounts of algae

• fewer rooted aquatic plants