Outdoors

Gulf of Mexico 'dead zone' expected to be largest ever; Louisiana to 'bear the burden' of its effects

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Four generations of the Olander family have shrimped the coast of Louisiana, but now Thomas Olander, chairman of the Louisiana Shrimp Association, is trying to convince his own son to get out of the family business while he’s still young as the Mississippi River spews poison into the Gulf of Mexico.

The shrimp are smaller, the young fish are dying off and the oysters have been beaten back. Crabbers say they’re pulling up traps filled with dead crustaceans.

The technical, scientific phrase for what’s going on is hypoxia: oxygen levels in the water unsupportive of most life. But everyone calls the hypoxic areas by a more grim name.

The dead zones.

This summer’s Gulf dead zone is projected to be the worst ever, and fishermen, shrimpers, crabbers, oystermen and others who rely on the seafood industry are feeling the hurt.

“It’s a ripple effect. From the hardware stores to the restaurants … everybody in the community (is affected,)” said Louisiana Shrimp Association president Acy Cooper.

Each spring, rains wash fertilizer as well as human and animal waste into the Mississippi River and its tributaries from 31 states. The U.S. Geological Survey has estimated the amount of fertilizer washing from the Mississippi and Atchafalaya into the Gulf this year would fill 2,800 train cars.

When the river empties into the Gulf of Mexico, algae feed on the nutrient-rich material but die when it is all consumed. As they decompose, the algae simultaneously make the water more acidic and deplete the oxygen levels, leading to hypoxia.

Most organisms can’t survive in these dead zones. Some animals like fish and shrimp can escape — though the hypoxia may retard their growth — but stationary species like clams and oysters just die.

LSU professor Nancy Rabalais has been studying the dead zone for decades, and other scientists rely on her annual forecast to predict the extent of the hypoxia. The dead zone will peak in late July and early August, and Rabalais expects it to become approximately the size of the state of Vermont, based on the amount of chemicals flowing down the Mississippi, most of which can be traced to fertilizer for corn and soybean farming.

There was some question as to whether tropical storm Cindy may have stirred up the water and caused the dead zone to dissipate, but it appears to have reformed, Rabalais said. If her projection holds, the 2017 dead zone will be the largest on record.

While Louisiana faces the cost of hypoxia, few of the nutrients originate here. Blame the midwestern “I” states — Indiana, Illinois and Iowa — says chemist Wilma Subra of the Louisiana Environmental Action Network.

“Louisiana’s not contributing that much to the dead zone but we are the recipients, so we have to bear the burden,” she said.

Even though the dead zones represent a massive problem, many officials said possible solutions are not getting the financial support they need.

“This was poorly understood, say, 15 to 20 years ago,” said Louisiana Sea Grant fisheries agent Rusty Gaudé.

In 1997, a National Hypoxia Task Force was established to reduce the Gulf dead zone through steps like restoring wetlands and improving agricultural irrigation, said Doug Daigle, founder of the Louisiana Hypoxia Working Group.

However, the national group hasn’t pursued all its options and so far has missed its own benchmarks, he said.

Smart people have come up with good ideas like limiting fertilizer use and creating more buffer zones to trap agricultural run-off, said Subra, the chemist. However, they haven’t been getting the money needed to take meaningful action, she said.

The mid-Atlantic has been much more aggressive in policing its waters. Between the states of New York and Virginia, everything eventually drains into the Chesapeake Bay, which has historically had its own problems with hypoxia. It’s a smaller and less complex watershed, but leaders have successfully cleaned it up, and now nitrates and phosphates are down and oyster and crab populations are up. The local striped bass was even brought back from the edge of extinction, Chesapeake Bay Foundation Director Will Baker and senior scientist Beth McGee told a group of environmental reporters last month.

It’s taken concerted action. Wastewater treatment plants have been upgraded; facilities like Washington DC’s are state of the art, McGee said. In Virginia, the government pays ranchers who put fencing along streams to keep livestock out of waterways and keep them clean. The federal Environmental Protection Agency withheld millions of dollars in funding to Pennsylvania one year when it missed a pollution benchmark.

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