Marine Biome

The marine biome is an aquatic environment typically found in the sea or ocean. With a salinity above 3.5%, seawater denser and less prone to freezing than fresh water. This is the largest biome on the world as seawater covers over 70% of the world.

  • Sunlight
    • Depth of water where photosynthesis can still occur (200 m/660 ft)
    • Temperatures can range from 40 to -3 oC
  • Twilight
    • Depth between 200 m and 1,000 m (660 - 3,300 ft)
    • Oxygen deplete around 500 m with only blue-green light
  • Midnight
    • Depth between 1,000 m and 4,000 m (3,300 - 13,000 ft)
    • No living plants, no sunlight
  • Abyssal
    • Depth of 4,000 m to the ocean floor