1. A geographic area in water bodies with critically low oxygen levels (typically less than 2 mg/L), severe enough to cause mass mortality of aquatic life and create dead zones
The Gulf of Mexico's severe hypoxic zone expands dramatically during summer months due to agricultural runoff.
A zona hipóxica severa do Golfo do México se expande dramaticamente durante os meses de verão devido ao escoamento agrícola.
2. An environmental condition where dissolved oxygen concentration is critically depleted, rendering the ecosystem largely uninhabitable for most aerobic organisms
Fish kills occur when aquatic ecosystems enter a severe hypoxic zone.
Mortandades de peixes ocorrem quando ecossistemas aquáticos entram em uma zona hipóxica severa.