What is hypoxia?
Hypoxia, or low oxygen, is an environmental phenomenon where the concentration of dissolved oxygen in the water column decreases to a level that can no longer support living aquatic organisms. Hypoxic areas, or “Dead Zones,” have increased in duration and frequency across our planet’s oceans since first being noted in the 1970s.
The largest hypoxic zone currently affecting the United States, and the second largest hypoxic zone worldwide, is the northern Gulf of Mexico adjacent to the Mississippi River.
Gulf hypoxia in the news:
Iowa's contribution to Mississippi River basin nitrate levels. (Photo: Lyndsey Nielsen/USA Today Network) Register Editorial Board / Des Moines Register June 28, 2018 Iowa Natural Resources Trust offers best solution to reduce farm [...]
Steve Hardy / The Advocate June 7, 2018 Once again, the Gulf of Mexico "dead zone" must be measured in the size of a U.S. state. LSU scientists predict this summer's iteration will exceed the [...]
Associated Press / The Times-Tribune June 7, 2018 Federal scientists are predicting an average dead zone this summer in the Gulf of Mexico. But they note that this would still be three times greater than [...]
Researchers are offering different explanations for changing ocean oxygen concentrations rather than appreciating multiple causality. Credit: raiPR (CC0) Peter Brewer / Eos May 14, 2018 Widespread declines in ocean oxygen concentrations are now [...]