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In page Mesopelagic zone:

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Microbial biomass and diversity typically decline exponentially with depth in the mesopelagic zone, tracking the general decline of food from above.[3] The community composition varies with depths in the mesopelagic as different organisms are evolved for varying light conditions.[3] Microbial biomass in the mesopelagic is greater at higher latitudes and decreases towards the tropics, which is likely linked to the differing productivity levels in the surface waters.[3] Viruses however are very abundant in the mesopelagic, with around 1010 - 1012 every cubic meter, which is fairly uniform throughout the mesopelagic zone.[3]