BIOSPHERIC INDICATORS
Hypoxic Events
Hypoxic Zones
In ocean and freshwater environments, hypoxic conditions occur when dissolved oxygen concentration is depleted to a certain low level below which aquatic organisms, especially immobile species such as oysters and mussels, endure severe stress or die.​​ Hypoxic conditions can occur naturally but are often the consequence of excessive nutrient input from human activities.
HYPOXIC CONDITIONS