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Aquatic macroinvertebrate communities are strongly influenced by their environment, and act as bioindicators for the overall condition of freshwater ecosystems. [10] Species have been classified based on their tolerance to environmental changes, and their assemblages can therefore indicate if an ecosystem is healthy.
Benthic macroinvertebrates have many important ecological functions, such as regulating the flow of materials and energy in river ecosystems through their food web linkages. Because of this correlation between flow of energy and nutrients, benthic macroinvertebrates have the ability to influence food resources on fish and other organisms in ...
Macroinvertebrate community structure is commonly monitored because of the diverse taxonomy, ease of collection, sensitivity to a range of stressors, and overall value to the ecosystem. [34] Additionally, algal community structure (often using diatoms) is measured in biomonitoring programs.
Benthic macroinvertebrates are found within the benthic zone of a stream or river. They consist of aquatic insects, crustaceans, worms and mollusks that live in the vegetation and stream beds of rivers. [9] Macroinvertebrate species can be found in nearly every stream and river, except in some of the world's harshest environments.
Macroinvertebrates within the same system may be residents from several months to multiple years, depending on the lifespan of each organism. Consequently, macroinvertebrate communities inhabit aquatic ecosystems long enough to reflect the chronic effects of pollutants and yet short enough to respond to relatively acute changes in water quality.
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Kamptozoa, goblet-shaped sessile aquatic animals, with relatively long stalks and a "crown" of solid tentacles, also called Entoprocta; Kinorhyncha, segmented, limbless animals, widespread in mud or sand at all depths, also called mud dragons; Loricifera, very small to microscopic marine sediment-dwelling animals only discovered in 1983;