River Continuum Concept

High school (ages 12+)
Environment & Earth

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/river-continuum-concept

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the publication year?1980
2. What is the core principle?Rivers exhibit a predictable longitudinal zonation of physical and biological characteristics
3. Why do different animals live in different parts of a river?Because the water speed, depth, and the amount of light change as the river gets longer, which creates different habitats for shredders, grazers, filter feeders, and predators.
4. How does the river get food in the middle part?In the middle reaches, plants and algae grow because there is more light, giving fish and other animals a fresh source of energy.

River Continuum Concept (RCC): An ecological model describing predictable changes in river ecosystems from headwaters to mouth.
Longitudinal Gradient: The gradual change in environmental conditions along the length of a river.
Allochthonous Inputs: Organic matter originating from outside the river system, typically from the surrounding watershed.
Autochthonous Production: Organic matter produced within the river system, primarily by aquatic plants and algae.