marine life

Physical Geography

Aquatic Dead Zones

Aquatic dead zones are bodies of water where the oxygen conditions are so low that marine life is unable to be supported.  The condition, known as hypoxia, occurs when dissolved oxygen (typically below 2 mg/l) is below the threshold  needed to sustain life and the water becomes a biological desert. Aquatic […]

Physical Geography

Census of Marine Life

A $650-million project that has been ongoing since May of 2000 to inventory and document every species in the world’s oceans is nearing completion.  Over 400 shipboard expeditions have yielded more than 5,600 new species and located species long thought extinct such as a shrimp thought extinct for 50 million […]