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Massive ‘dead zone’ in Gulf of Mexico sets new record

Dead zones in the Gulf of Mexico may be a factor in the deaths of marine animals. Patrick Semansky/AP

NEW ORLEANS — There’s an unwanted record in the Gulf of Mexico: This year’s “dead zone,” where there’s too little oxygen to support marine life, is the biggest ever measured.

Scientists say the oxygen-depleted region is about the size of New Jersey, covering 8,776 square miles (22,720 square kilometres).

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Scientist Nancy Rabalais has been measuring the area since 1985. She and the National Oceanic and Atmospheric Administration released the latest measurement Wednesday.

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Rabalais says the area was actually larger, but the mapping cruise had to stop before reaching the western edge.

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Studies based on nitrogen and phosphorus in the Mississippi River had predicted one of the largest dead zones ever.

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The nutrients, which get carried down from the river, feed plankton blooms that die and sink. Their resulting decay uses oxygen.

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