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Background For Teachers:
Shredders are those organisms that chew on intact or large pieces of material. Leaves, needles, flowers, and twigs that fall from trees and shrubs on the shore into the water are the most common food for shredders.
Collectors acquire and ingest very small particles of organic matter. They eat the organic matter suspended in the water by catching it with net-like features or other adaptations. Often they eat fine organic matter that has fallen out of suspension onto the streambed (substrate).
Scrapers (also called grazers) remove and eat the algae growing on rocks in shallow water.
Predators are organisms that prey on other organisms. They have special mouthparts called mandibles which they use to pierce prey and hold it while they eat.
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