Which of the following does not contribute to water pollution?
Explain how the conversion of wetlands to farmland has impacted streams and rivers.
Converting wetlands to farmland removes natural filters and water-storage areas. More runoff, soil erosion, sediment, fertilizers, and pesticides can then enter streams and rivers, altering water quality and habitats and reducing biodiversity.
Compare the characteristics of rivers and streams.
Rivers and streams are both flowing bodies of water that travel through channels with beds and banks. Streams are usually smaller, narrower, and shallower, while rivers are generally wider and deeper and may receive water from many streams and tributaries.
How do streams conserve biodiversity?
Explain how current and oxygen content affect the biodiversity of streams and rivers.
Current creates different habitats and affects how much oxygen mixes into the water. Faster-flowing water is often better aerated, and higher dissolved oxygen supports more oxygen-sensitive organisms. Slow or poorly oxygenated water can limit which species survive, so differences in current and oxygen levels shape biodiversity.
How is water introduced into rivers and streams?
Water enters rivers and streams through precipitation and surface runoff, groundwater seepage and springs, and inflows from tributaries. Melting snow and ice can also supply water.
Which of the following is not a characteristic of the source of rivers and streams?
Riparian foliage _______.
Explain why the middle sections of rivers have the greatest biodiversity.
The middle sections of rivers have a mix of habitats, a greater supply of nutrients and food, and conditions that are less extreme than those at the source or mouth. This variety of suitable conditions allows many different plants and animals to live there.
Where is light penetration in a river or stream likely to be lowest?
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