dead zones

Dead zones form when big balloons of phytoplankton at the surface trigger large quantities of organic matter, which then sink to the bottom.

Such fertilizer leaching is responsible for dead zones across the world, like the one at the mouth of the Mississippi River currently.

Pollution-fed algae, which deprive other living marine life of oxygen, are the cause of most of the world's dead zones.

Marine dead zones form when nitrogen and phosphorus pollution concentrates in near-coast waters through a process called eutrophication.

This can trigger toxic algal blooms and a rising number of oxygen deficient 'dead zones'.

Many human activities on land trigger the seasonal appearance of dead zones. Fertilizers run off lawns and farmland.

Oxygen-deprived "dead zones" already exist in the oceans, including an area of thousands of square kilometres in the Gulf of Mexico.

Red circles on this map show the location and size of many of our planet's dead zones.

The Mississippi River watershed drains directly into the Gulf of Mexico, where dead zones frequently occur.

This vicious cycle gets worse as the spreading dead zones engulf the cod's deep-water breeding grounds, he added.

"Dead Zones" occur around the world, from the Chesapeake Bay to the Baltic Sea.

Already cap-and-trade schemes are springing up in some American watersheds because of concern about the spread of dead zones.

Techniques to minimize problems with dead zones associated with panoramic cameras are described.

"Old problems persist and new ones like nutrient-rich 'dead zones' and the impacts of climate change are emerging, " said Steiner.

It's no coincidence that dead zones occur downriver of places where human population density is high (darkest brown).

Black dots show where dead zones have been observed, but their size is unknown.

Agricultural runoff has created dead zones in the Gulf of Mexico, with oxygen levels too low to support life.

Such crops could reduce both nitrous oxide emissions and the nitrogen run-off that creates dead zones in the oceans.

including conditions that may lead to phenomena, like dead zones. There is no question that the earth is changing.

Australian scientists fear the planet is on the brink of another mass extinction as ocean dead zones continue to grow in size and number.

Most marine organisms need oxygen for survival, and dead zones prove fatal for many aquatic species.

Nitrogen rounds off run offs from farms can create large dead zones, like those in the gulf Gulf of Mexico.

Clean soil is a critical problem -- the nitrification, the dead zones in the Gulf of Mexico.

Instead we suffer ever more coastal "dead zones" overrun by nitrogen-fed algal blooms.

While the algae aren't toxic, big blooms can create oxygen-poor "dead zones" in the water and leave an unpleasant odor on beaches.

Nitrogen runs out runoffs from farms can create large dead zones, like those in the Gulf of Mexico.

Nitrogen runoffs from farms can create large died dead zones, like those in the Gulf of Mexico.

Nitrogen run-offs run offs from farms can create large dead zones, like those in the Gulf of Mexico.

Nitrogen runoffs from farms can create large dead zones, like those in the gov Gulf of Mexico.

Nitrogen runoffs from farms can create large dead zones, like those in the Gulf of Mexico.

Nitrogen rumors runoffs from farms can created create large deadzones dead zones, like those in the gove Gulf of Mexico.

An algal bloom is a feast for the microscopic decomposers, and the dead zones can persist for months as a result.

Nitrogen run ups runoffs from farmers farms can create large digazone dead zones, like those in the Gulf of Mexico.

Many potential customers have chosen to buy Android handsets from other carriers to avoid problems with dropped calls and dead zones.

NutrigonNitrogen runoffs from farms can create large dead zones, like those in the golf Gulf of Mexico.

Nitrogen runoffs from farms can create large deadzones dead zones, like those in the Gulf of Mexico.

Nitrogen runoffs from farms can creat create large dead zones, like those in the Gulf of Mexico.

Hundreds of the world's coastal regions have dead zones.

But they are increasing in both size and number: dead zones have now been reported in more than 400 areas.

"Dead zones" with almost no oxygen already make up around 2 per cent of the oceans by area, and they could expand seven-fold.

She is also concerned about marine pollution and the appearance in the ocean of oxygen-depleted dead zones caused by such pollution.

Give them a huge oil blowout, and they can use up enough oxygen to create anoxic "dead zones" that imperil fish and other sea creatures.

More than 400 dead zones with a total area of 245, 000 square kilometers were identified worldwide last year.

Adaptive Fuzzy Control for a Class of MIMO Nonlinear Systems with Unknown Dead-zones

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