Editing Habitat-days under hypoxia (section)

== Geographic / System Context ==
Hypoxia occurs in a variety of aquatic systems worldwide, including coastal waters, estuaries, and some freshwater bodies. These environments are often influenced by nutrient loading from terrestrial sources, water stratification, and biological oxygen demand, which contribute to oxygen depletion. Coastal regions with restricted circulation or high productivity are particularly susceptible to hypoxic events. The global geographic scope of habitat-days under hypoxia encompasses diverse marine and freshwater habitats where low oxygen conditions impact biological communities.