At first glance the sand seems barren and unproductive. After a while, if you are careful not to kick up sand, you might see tiny benthic communities of tube-building worms come alive as they sweep the passing nutrient rich waters with tentacles to capture food.
Source: tatoeba (6604363)
The oceanic ecosystem includes the pelagic zone, the benthic zone, and the abyssal zone.
Source: tatoeba (11567747)
The benthic environment, except for intertidal areas, has been scarcely explored[…]
Source: wiktionary
As the classical approach to benthic community studies originated primarily with Danish biologists, a section is devoted to comparisons of Danish bottom communities with those obtained in Hadley Harbor.
Source: wiktionary
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