Gulf oil spill threatens ecological devastation

Seafood industry, wetlands and wildlife at risk

cleanup tricky

April 30, 2010|By Timothy B. Wheeler, The Baltimore Sun

The oil that began washing ashore Friday in Louisiana could devastate one of the richest coastal ecosystems in the country and cripple a major source of the nation's seafood, a top Maryland scientist warns.

But Donald F. Boesch, president of the University of Maryland Center for Environmental Science, said a rush to clean up oil smothering sensitive wetlands could risk further damage if not done right.

Fish and shellfish, shorebirds and waterfowl, sea turtles and a host of other wildlife are at risk from the more than 200,000 gallons of oil pumping daily out of the ruptured well in the Gulf of Mexico 50 miles off the Louisiana coast. Animal rescuers on the Gulf Coast said the spill could be "the worst environmental disaster in recent U.S. history." Efforts this week to halt the leak proved futile, and authorities have said it might take up to three months to shut it off.

The fact that the spill will go on for weeks or months could hamper recovery and amplify damage, said Boesch, a New Orleans native who went to school there and spent a decade as a marine biologist in Louisiana before coming to Maryland.

Winds are blowing the spreading oil northward toward shore, targeting fragile barrier islands and Louisiana's vast marshlands — about 40 percent of all the coastal wetlands in the lower 48 states. Those marshes — vital habitat and nursery grounds for fish, shellfish, birds and other wildlife — could be seriously damaged if coated with petroleum.

Because the vast majority of commercially valuable fish and shellfish caught in the Gulf depend on wetlands for some part of their life cycle, the spill could have a devastating impact on the region's seafood and recreational fishing industries.

"Spring is an important time for reproduction of marine life," Boesch noted.

Landings of shrimp, crabs and oysters all could be affected by the spill, according to the National Oceanic and Atmospheric Administration. The Gulf is the source of 73 percent of the shrimp caught in this country, 26 percent of the blue crabs and two-thirds of the oysters. Gulf crustaceans and shellfish make up an important component of the mid-Atlantic seafood market, supplementing what's caught in the Chesapeake Bay.

Boesch said he's particularly concerned about the spill's impact on oyster beds in Louisiana. Even if they aren't killed by the pollution, they may become contaminated with toxic ingredients of petroleum, such as benzene, he said. And even if only a fraction of the beds are closed by the spill, consumers may shun Gulf seafood, exacerbating the economic impact.

"No one wants to eat oily oysters," he said.

The marshes also hold "an incredible variety and diversity of birds," Boesch said. One he's particularly worried about is the brown pelican, Louisiana's state bird, a fish-eating shore dweller that survived near-elimination decades ago from exposure to the since-banned pesticide DDT.

Miles of floating booms are being deployed to keep the oil from land, and chemicals are being sprayed on the slick to break up the oil. Volunteers and cleanup contractors are rushing to the region to aid with injured wildlife and cleanup efforts. But should oil coat the wetlands, Boesch said, he hopes remediation proceeds with care.

"Once it gets into these marshes, the natural feeling and public pressure is, ‘You've got to go clean it out, get it out,'" Boesch said. But unleashing hordes of volunteers to soak up spilled fuel tramples grasses and drives the oil deeper into the muck. Though the oil may coat and kill existing marsh vegetation, it's likely to regenerate in a fairly short period of time, he said.

Boesch's warning was echoed by Jonathan McKnight, associate director of wildlife for the Maryland Department of Natural Resources, who helped coordinate cleanup a decade ago of a 140,000-gallon oil spill from a ruptured pipeline in Southern Maryland.

The marshes along the Patuxent River at Chalk Point "got trashed" with thick, gloppy fuel oil, McKnight recalled. "We trashed them further cleaning it up. ...You send in hundreds of guys in yellow suits with rags to mop it all up. That's not good for them, either."

The April 2000 Patuxent spill — just a fraction the size of what has already leaked into the Gulf — fouled 76 acres of wetlands and 10 acres of beach, killed an estimated 600 ruddy ducks and other birds, hundreds of muskrats and more than 100 diamondback terrapins. Biologists also figured the surviving terrapins suffered a drop in reproduction as eggs they laid in the oil-tainted marsh failed to hatch.

McKnight said he'd worry first about sea turtles and shorebirds along the Gulf Coast. There are at least five species of endangered or threatened turtles in the Gulf, including the Kemp's Ridley. Biologists note that the only place where the Kemp's Ridley nests is in the western Gulf, from Texas to the mouth of the Mississippi River.

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