macrobenthos

biology

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Last updated

June 30, 2026

Quick Summary

Macrobenthos refers to relatively large organisms that live on or in the bottom of bodies of water. These organisms lack a backbone and are visible without a microscope. They are a crucial part of freshwater and marine ecosystems, forming the base of the food chain and serving as a food source for other animals.1234

Macrobenthos also play a vital role in breaking down plant material, converting it into energy usable by other aquatic life. Due to their nonmigratory nature and sensitivity to environmental changes, they are valuable indicators of water quality and ecosystem health.2

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4 Britannica Sources

macrobenthos
macroinvertebrate
benthos
marine ecosystem - Links between the pelagic environments and the benthos

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benthos
…the best-studied benthos are the macrobenthos, those forms larger than 1 mm (0.04 inch), which are dominated by polychaete worms, pelecypods, anthozoans, echinoderms, sponges, ascidians, and crustaceans. Meiobenthos, those organisms between 0.1 and 1 mm in size, include polychaetes, pelecypods, copepods, ostracodes, cumaceans, nematodes, turbellarians, and foraminiferans. The microbenthos, smaller…
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…the best-studied benthos are the macrobenthos, those forms larger than 1 mm (0.04 inch), which are dominated by polychaete worms, pelecypods, anthozoans, echinoderms, sponges, ascidians, and crustaceans. Meiobenthos, those organisms between 0.1 and 1 mm in size, include polychaetes, pelecypods, copepods, ostracodes, cumaceans, nematodes, turbellarians, and foraminiferans. The microbenthos, smaller…
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marine ecosystem
Benthos
The macrobenthos are those organisms larger than 1 millimetre. Those that eat organic material in sediments are called deposit feeders (e.g., holothurians, echinoids, gastropods), those that feed on the plankton above are the suspension feeders (e.g., bivalves, ophiuroids, crinoids), and those that consume other fauna in…
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The macrobenthos are those organisms larger than 1 millimetre. Those that eat organic material in sediments are called deposit feeders (e.g., holothurians, echinoids, gastropods), those that feed on the plankton above are the suspension feeders (e.g., bivalves, ophiuroids, crinoids), and those that consume other fauna in…
Read More