. "EcoLexicon:aphotic_zone"^^ . "AphoticZone"^^ . "Wikipedia:Aphotic_zone"^^ . "SWEETRealm:AphoticZone"^^ . "The zone of an ocean below 200m, in which photosynthesis cannot occur due to the lack of light."^^ . "ENVO:00000210"^^ . "aphotic zone"^^ . "ENVO"^^ . .