Can We Rescue Oiled Wildlife?
New research indicates that the answer is a cautious yes, although spills in the Gulf of Mexico and elsewhere suggest considerable improvement is still needed
- By John Carey
- Jun 17, 2010
A MONTH AFTER AN EXPLOSION on a deepwater oil-drilling platform in the Gulf of Mexico unleashed the biggest oil spill in United States history, the oil began to creep into Louisiana’s coastal marshes. It threatened crabs and oysters. It lapped against the stalks of marsh grass, choking off the roots’ oxygen and threatening the lifeblood of this richly productive ecosystem. Dead jellyfish bobbed offshore, their clear globes stained with oil. And as pelicans dive-bombed for fish, they emerged with a coating of sludge. Watching one bird struggle unsuccessfully to fly, yet display enough strength to evade rescuers, Robert J. Barham, head of the Louisiana Department of Wildlife and Fisheries, said, “It’s heart-rending—a blow to the pit of your stomach.”
An army of more than 20,000 people tried to hold back the dark tide, shoveling tar from beaches and laying down millions of feet of oil booms. They were fighting not just millions of gallons of oil but also long odds. The grim lesson from past spills: The techniques used to corral and skim up oil are mostly just “public relations,” says Robert Howarth, ecology professor at Cornell University and a veteran of the 1989 Exxon Valdez and other spills. “The physical methods almost always don’t work,” he says.
Doug Inkley, NWF senior scientist, calls an oil spill a Humpty Dumpty situation. “Once the oil is in the water, you are never going to recover even 10 percent of it.” Those odds will leave it mostly up to nature’s cleaning crew, microbes. By the second month of the spill, oxygen levels in the deep gulf were dropping—evidence that bacteria were already on the job, burning oxygen as they munched on oil. “The microbes have to save us again,” says University of Georgia marine scientist Samantha Joye, who was out at sea tracking the oil plumes. In the open water, bacteria are capable of consuming the oil in a few months. But in sediments and marshes, where oxygen is scarce or absent, the process slows dramatically. Forty years after a spill from the barge Florida off Cape Cod, and 21 years after Exxon Valdez, oil is still buried in mud and gravel.
The long life of spilled oil is one reason the eventual environmental and economic toll of the current disaster is hard to predict, scientists say. Complicating the assessment further, no previous spill took place in such deep water, and none involved the use of so many hundreds of thousands of gallons of toxic chemicals to disperse the oil. “Unfortunately, this will be the biggest experiment that we’ve ever had in oil-spill research,” says biologist Carys L. Mitchelmore of the University of Maryland Center for Environmental Science, whose own work shows that even small amounts of dispersant chemicals harm corals.
If there was one sliver of good news in this huge environmental and human tragedy, it was the effort mounted to save birds and other animals affected by the oil. In an industrial building turned wildlife rescue station in Fort Jackson, Louisiana, for example, workers clad in blue slickers and long yellow gloves sprayed a dilute solution of Dawn detergent on a brown pelican covered in oil. Using their hands, swabs and Q-tips, they delicately washed the bird from beak to toe. “It’s almost like shampooing your hair,” explained Jay Holcomb, executive director of the International Bird Rescue Research Center, which was working with Tri-State Bird Rescue and Research (under contract with the U.S. Fish and Wildlife Service) to save oiled animals. By mid-June, rescuers at four wildlife rehabilitation centers in the gulf had cleaned, nourished and released several dozen pelicans, northern gannets and herons.
Even this seemingly successful operation is not without controversy. “It’s a humanitarian effort that shouldn’t be confused with really making a difference to the birds and their populations,” warns Oregon ornithologist and biological consultant Brian Sharp, who helped determine the number of birds killed by the Exxon Valdez spill.
Consider the bleak track record. Biologist James Estes, of the University of California–Santa Cruz, calculated that each sea otter washed and released after Exxon Valdez cost $80,000—and two-thirds of them died within two years anyway; biologists estimate that natural annual mortality for the species is about 6 percent. An estimated 375,000 to 700,000 birds were killed by the Exxon Valdez spill, Sharp says, compared with 800 rescued (at a cost of $41 million)—and most of those died within days of being released. Cleaned and released birds should be counted among the dead, Sharp contended in the journal Ibis in 1996 and still believes today. That’s why, as harsh as it sounds, the standard practice in Germany and Norway has been euthanizing oiled birds and other wildlife.
In the United States, the public outcry over animal suffering made it impossible not to try to save oiled wildlife in Alaska and elsewhere. But based on the Exxon Valdez and other spills, many population biologists thought money spent on rescue work was money wasted. Far better to spend the cash on preserving habitats or helping endangered species, they said. Some ornithologists even tried to block the 1994 creation of an official response unit at the California Department of Fish and Game: the Oiled Wildlife Care Network. “Those were some of the ugliest days in science,” recalls wildlife biologist Richard T. Golightly of Humboldt State University.
In the years since, rescuers have blunted the criticism by getting better at what they do. The Oiled Wildlife Care Network, administered by the University of California–Davis (UCD), has built or helped outfit a dozen facilities capable of rehabilitating animals on a moment’s notice, caring for thousands of birds and other animals in more than 75 spills. Responding so quickly has been one key to better results, says Dave Jessup, director of California Fish and Game’s Marine Wildlife Veterinary Care and Research Center in Santa Cruz. Researchers also have improved their methods. “Our knowledge has grown exponentially,” says Michael Ziccardi, the veterinarian and UCD professor who heads the care network.
In California, for both birds and sea otters, the immediate threat created by a spill is the insidious effect of oil on their natural waterproofing. Normally, inner feathers or hair form an intricate interlocking structure that traps air next to the skin, keeping creatures dry and warm. Oil breaks up that structure. Suddenly, the animals can’t stay warm. They must eat more to rev up their metabolism. Unfortunately, the coating of oil makes it harder to float, fly, swim—or catch food. Then, as the creatures frantically preen and groom, they swallow and inhale oil. That ingestion can lead to pneumonia and organ damage. Death is usually swift and far from help. “The vast majority of animals that come in contact with oil are never even seen,” Estes says. Of the 584 affected birds found in the gulf by the end of May, 506 were already dead.
When oiled animals are lucky enough to be captured, the crucial task is quickly restoring their natural insulation. The actual washing, using Dawn detergent, hasn’t changed much since Exxon Valdez in March 1989. But years of research on birds and on captive otters experimentally coated with canola oil have shown that the standard rinse with salt water leaves behind salt crystals and soap scum, disrupting the air layer. Rinsing with warm and softened freshwater works far better, scientists discovered. So does putting the cleaned animals into recovery tanks filled with softened freshwater. “We found we could cut the time from washing to full recovery in half,” Jessup says. His team had a chance to try the new methods for real on February 21, 2009, when a female sea otter coated in tar washed up in Monterey Bay. After her bath and freshwater rinse, she dined on abalone, prawns and clams for six weeks before growing strong enough to return to the wild (complete with a radio transmitter and a Facebook following). Jessup pegs the total cost for all her care at a bargain $5,000.
Similar improvements in care have been made for pelicans, common murres and other birds. And thanks to the battle against AIDS, rescuers have an arsenal of effective antifungal drugs to fight the infections that birds often develop in captivity. As a result, “the percentage of animals that survive to be released has increased dramatically,” the care network’s Ziccardi says. “Now, on average, it’s 50 to 70 percent.”
But do the released animals actually stay alive in the wild? Humboldt State’s Golightly was one of the skeptics. When an oil pipeline ruptured off the California coast in 1997, coating gulls and other birds with crude, Golightly figured it was a chance to answer the question. “Gulls are hardy,” he says. “If rehab didn’t work with them, then we didn’t need to waste time with any species.” Golightly outfitted released birds with radio transmitters. He also put captured non-oiled gulls through the cleaning process for a comparison. “I was frankly astounded,” he says. “Every one of the oiled birds survived as long as the radios lasted.” After he also got good results with common murres in a 1999 oil spill in Humboldt Bay and with surf scoters in 2007, Golightly became a believer in wildlife rescue—especially when populations are small and each individual animal matters. “I find myself converted to the notion that there is a significant effect on wildlife populations,” he says. Another benefit: “The data we collect will be part of evidence used to put a dollar value on the damage to the environment,” Ziccardi says.
Although rescuing even a handful of individuals belonging to an endangered species, such as the Kemp’s ridley sea turtle, can be critical to a population, successfully releasing a few rescued animals of any kind into the wild will not do much to make the gulf environment—and the region’s economy—whole again, scientists say. Even the pelicans and other birds lovingly cleaned of oil could be harmed by the long-term effects of oil and chemical dispersants, especially since animals could simply be exposed again in the wake of a massive spill such as the one in the gulf. Indeed, biologist Daniel Esler of the Centre for Wildlife Ecology at Simon Fraser University found that Alaskan harlequin ducks were still dying at a higher rate than normal from exposure to oil up to 14 years after Exxon Valdez. “The big lesson is that the oil persisted in the environment much longer than we expected,” he says.
Overall, the toll to gulf birds, turtles, sperm whales and other wildlife, along with the region’s $4-billion-per-year seafood industry and a whole way of life, is expected to be enormous. “It’s taken 20 years to figure out the effects of oil in Alaska,” Jessup says. “It could take longer with this spill.” One crucial question: How much of the coastal marshes can be protected from the oil?
Another danger of applauding wildlife rescue too much is that it diverts attention from the overall toll, Estes warns. “The thing I really object to is that the public is left with the impression that we are dealing with the problem,” he says. “We aren’t dealing with the problem.” NWF’s Inkley adds, “Focusing on birds and mammals, while it has its place, distracts from the larger trauma of habitat destruction as well as the harm, especially in the deep-water BP oil spill, to marine creatures living far beneath the water surface. We will likely never know the full toll for those species and can do nothing to rescue them.”
The real issue, of course, is that while fossil fuels have brought unprecedented global progress and wealth, they also are a deal with the devil. They cause everything from climate change and pollution to global political unrest. “I think this spill is one of the costs we pay for the life we live, if we want to utilize petroleum resources,” Estes says.
“The real solution is to work more diligently to reduce the risks of spills further,” Cornell’s Howarth says. Environmentalists hope, for instance, that this tragic spill will finally push the country—and the world—toward cleaner energy alternatives. As NWF president Larry Schweiger concluded during testimony before Congress in May, “We have a real opportunity to turn the corner on our destructive and decades-long dependence on oil.”
Virginia writer John Carey is a former senior correspondent for Business Week, who covered science and the environment.
Why We Must Try to Save Oiled Birds
Read an editorial by NWF naturalist David Mizejewski on CNN.com.
NWF on Site: Combatting the Gulf Oil Spill
Within days of the Deepwater Horizon explosion, NWF wildlife experts were on the Gulf of Mexico observing effects on wildlife both on land and sea. NWF also has been deploying volunteer teams of local birders, hunters and anglers in key places around the gulf to report on imperiled wildlife and to track the spread of oil. While urging that the federal government, not BP, should be monitoring the disaster and determining the extent of damage, NWF has created a formal science team to examine spill issues such as the use of dispersants and the potential impacts on wildlife. The organization also is campaigning for a permanent ban on drilling in critical polar bear habitat in Alaska’s Beaufort and Chukchi Seas, where drilling may be even riskier than in the gulf. To learn more and find out how you can help, visit www.nwf.org/oilspill.
Whales at Risk
The BP spill threatens a unique population of fewer than 2,000 endangered sperm whales that live exclusively in the Gulf of Mexico, are smaller than other sperm whales and have their own distinct calls.