Which organisms are identified as grazers and scrapers?

Grazers and scrapers are organisms that primarily feed on materials that are growing on surfaces, such as algae and biofilm found on rocks and other substrates in aquatic ecosystems. This group includes various herbivorous animals that utilize specialized mouthparts to scrape off these growths. The feeding behavior of grazers and scrapers is crucial for controlling algal populations and maintaining the health of ecosystems.

These organisms play an important role in nutrient cycling by breaking down and consuming primary producers, which allows for nutrient uptake by other organisms in the food web. Thus, identifying grazers and scrapers as those that feed on material growing on rocks aligns perfectly with their ecological function and behavior.