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1. A condition characterized by abnormally low levels of oxygen in the blood and tissues.
2. In ecology, a condition in which inadequate environmental oxygen is available to an organism.

The "Dead Zone" off the Louisiana coast mapped during the last week of July, 2006, is reported to be 6,662 square miles; or about the size of Connecticut and Rhode Island combined, Dr. Nancy Rabalais, Chief Scientist for Northern Gulf of Mexico Hypoxia Studies reported on Friday. The low oxygen waters extended from near the Mississippi River to the Louisiana-Texas border.

Agricultural runoff in the vast area drained by the Mississippi River contributes most of the nitrogen, phosphorus and other nutrients that feed a population boom of algae. As the algae die, they fall to the bottom. Their decay consumes oxygen faster than currents can bring it down from the surface.

—Published July 29, 2006, in Space and Earth;
" 'Dead Zone' off La. coast gets larger"
This entry is located in the following units: hypo-, hyp- (page 14) oxy-, -oxia, -oxic (page 1)