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The pelagic zone can be thought of in terms of an imaginary cylinder or water column that goes from the surface of the sea almost to the bottom. Conditions differ deeper in the water column; the pressure increases, the temperature drops and less light penetrates.he pelagic zone can be contrasted with the benthic and demersal zones at the bottom of the sea. The benthic zone is the ecological region at the very bottom of the sea.
The Pelagic Zone. The word pelagic is derived from the Greek work pelagos, pÃ©lagos meaning open. Ocean it is the name for oceanic water not in direct contact with a shore or the. Bottom it is by far the largest aquatic biome terms of, volume but in comparison to many of the other, biomes it is a. deserthe pelagic zone is further divided up into vertical sub-zones as seen in the image below. This biome vertically joins with the Deep Sea biome once the illuminated surface layers are passed. For more information on the deeper pelagic waters, please also visit our deep sea biome page.