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- Dead zone (ecology)
Low-oxygen areas in oceans and large lakes caused by nutrient and fertilizer pollution
Dead zones are hypoxic (low-oxygen) areas in the world's oceans and large lakes. Hypoxia occurs when dissolved oxygen (DO) concentration falls to or below 2 mg of O 2 /liter. When a body of water experiences hypoxic conditions, aquatic flora and fauna begin to change behavior in order to reach sections of water with higher oxygen levels. Once DO declines below 0.5 ml O 2 /liter in a body of water,... Wikipedia
