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The benthic zone is the ecological region at the lowest level of a body of water such as an ocean or a lake, including the sediment surface and some sub-surface layers. Organisms living in this zone are called benthos, e.g. the benthic invertebrate community, including crustaceans and polychaetes. The organisms generally live in close relationship with the substrate bottom and many are permanently attached to the bottom.
Overview. Benthic habitats cover about 70% of the earth surface. Of the marine species, 98% live on or in the ocean floor. The benthic zone maintains a substantial part of the worldâs biodiversity.However not all of the benthic habitats are equally susceptible to alien species invasion.f all marine species, 98% live on or in the ocean floor. These organisms are called benthos, or bottom dwellers. There are those called infauna that live buried in the sand, shells or mud.