Birds And Their Habitats Studied For BP Spill Effects
This text was published within the Louisiana Weekly in the May 28, 2012 edition.
Brown pelican eggs washed away this spring from an island eroded by oil in Louisiana’s Plaquemines Parish — near the positioning of BP’s spill two years ago. In Minnesota, traces of oil and Corexit were found recently in eggs from white pelicans that winter in the Gulf. Scientists have collected bird data for Natural Resource Damage Assessments, or joint government and BP studies of the spill’s impacts. That information will be utilized by the feds within the BP spill trial, scheduled for January in U.S. District Court in New Orleans. BP may introduce its own findings on birds then, based on wildlife experts.
The U.S. Fish and Wildlife Service counted 6,147 dead and three,046 injured birds within the Gulf in the 12 months after the spill began in late April 2010.
David Muth, the National Wildlife Federation’s Louisiana state director, said last week, “The federal numbers on birds lost to the spill are minimums, and we are able to assume multiplier effects for birds that died and sank or disappeared in other ways.” Actual losses are larger than the data indicate, he said from New Orleans. Years after the 1989 Exxon Valdez spill, estimates of related seabird deaths and injuries ballooned to 250,000.
Muth discussed the impact of the spill on brown pelicans, which were faraway from the endangered species list six months before the BP spill. “Brown pelicans were on a protracted trajectory of recovery before the spill,” he said. “They were doing very well, considering they’d ceased to breed on the northern Gulf Coast 50 years before. That they had recovered to that time that they might take a big hit, and they got it from the spill.” Brown pelicans are Louisiana’s state bird.
The spill’s impact on brown pelican numbers is unknown at this juncture, he said. “These are long lived birds,” he said. “Earlier, when pelican populations were impacted by DDT, they continued to survive for a few how to find density of crude oil years until breeding stopped.” DDT was banned as an insecticide within the U.S. in 1972.
“Even when the current size of the pelican population were known, it will only tell us a lot because at the sublethal level, oil within the environment is taken up by fish, resides in fish tissue and finally ends up in pelican tissues,” Muth said. “We can’t know the long-term effects of that for awhile but we’ll see an impact.”
Nesting areas in Plaquemines Parish’s Barataria Bay, including islands of mangrove trees — where pelicans lay eggs — were hit hard by oil, Muth said. “Islands where birds nest are eroding away,” he noted. BP oil killed vegetation and hastened land loss on isles that were already shrinking because the ocean rises.
Chris Macaluso, coastal coordinator with the Louisiana Wildlife Federation, said along with pelicans, the spill hurt terns, gulls, green herons and many other species. “It wasn’t a lot birds being covered with oil because it was the impact of the oil cleanup on their habitat,” he said. “Equipment brought on beaches interfered with tern nest sites, and boom to contain oil was placed around small rookeries. Human activity, like laying boom and retrieving it later, interfered with habitat.”
The cleanup disrupted birds as workers stomped around with shovels, and fishermen employed by BP tossed boom from boats and leaned out to mop oil from marshes. In July 2010, the American Bird Conservancy said that cleanup efforts had disturbed nesting and that noisy, air boats had flushed pelicans and terns from roosting sites.
Last week, Plaquemines Parish officials said tides this spring swept away brown pelican nests built earlier in the year on Cat Island in Barataria Bay. Chicks and eggs are gone. In accordance with the parish, BP oil killed mangroves, which helped to hold the island together and gave birds a place to nest. With few mangroves left on the island, pelicans built nests on the ground early this year.
The parish and state of Louisiana are asking BP for funds to construct a barrier around 40 acres of Cat Island. The plan is to construct smaller islands throughout the protective barrier, and to plant mangrove trees. Last week, Plaquemines Parish Coastal Director P.J. Hahn said small islands off the coast are among the many few nesting grounds left for a lot of threatened and endangered birds, and they are freed from natural predators.
In Louisiana, piping plovers are how to find density of crude oil a threatened species and interior least terns are endangered.
Macaluso said small islands don’t have the racoons, skunks, dogs and feral cats found on bigger islands. He said the Louisiana Wildlife Federation and other organizations have encouraged NRDA researchers to review the role of little isles as bird habit. “Sometimes a small island is the one refuge in a large stretch of open water, and birds and fish need them as well as to bigger, barrier islands,” he said.
Meanwhile, Minnesota researchers have found petroleum compounds and Corexit, used to disperse BP oil within the Gulf, in the eggs of nesting pelicans. Scientists are studying impacts of the BP spill on North America’s biggest colony of white pelicans at Minnesota’s Marsh Lake, which hosts an estimated 34,000 adult birds raising 17,000 chicks a year.
“Petroleum compounds were present in 20 of the first batch of 22 Minnesota pelican eggs tested recently, and 18 of those eggs also contained Corexit,” said Carrol Henderson, nongame program supervisor on the Minnesota Dept. of Natural Resources. Pelicans were exposed to oil in 2010 and subsequent years. Most white pelicans winter in the Gulf, and their young spend a full year down south before they begin breeding.
“Specifically, the Corexit found within the eggs appears to be pretty closely tied to the spill,” Henderson said. Minnesota researchers are concerned that pelicans and loons wintering on the coast came into contact with polycyclic aromatic hydrocarbons — known to cause cancer and birth defects in animals — and Corexit, which contains cancer-causing chemica0ls and endocrine-disrupting compounds, he said.
Henderson said lab tests are being conducted on tissue samples from adult loons in Minnesota, with results expected soon. After loons spend two years in the Gulf — mainly Florida and Alabama — they return to how to find density of crude oil Minnesota within the third year.
“Minnesotans love to watch loons, our state bird, on the lakes, just as Louisianans are fond of watching brown pelicans,” Henderson said. Two years ago, U.S. Geological Survey scientists outfitted test loons with satellite transmitters so their travels to the Gulf can be studied, he said. For anyone interested in migratory birds, loon movements will be followed on the net at umesc.usgs.gov.
Starting in 2010, a government program enticed birds into fields and away from oil within the Gulf. “We wanted more habitat before the spill due to wetlands loss, and we would have liked it during and after the spill because of the oil,” Macaluso said. The 2010 Migratory Bird Habitat Initiative or MBHI provided food sources for ducks and other birds. With $40 million in funding, the Natural Resources Conservation Service enrolled 470,000 acres owned by farmers and others in the Gulf states, Arkansas, Missouri and Georgia. Landowners were paid to create mudflats and shallow water areas, and south Louisiana rice farmers eagerly participated.
Tim Landreneau, a Louisiana-based program specialist with the NRCS, said “an estimated 36 percent of the energy needed to support target duck populations across south Louisiana was satisfied on 176,821 acres of MBHI lands” within the southwestern part of the state in 2010. Waterfowl food needs are often monitored in duck energy-days or what’s needed to support a duck.
As for the Natural Resource Damage Assessments, the U.S. Dept. of the Interior has conducted studies along the Gulf assessing oiling and mortality of colonial water birds, pelagic birds and secretive marsh birds, and injury to piping plovers. Atlanta-based Nanciann Regalado, spokeswoman for the Dept. of the Interior, said “the sphere collection of knowledge is complete and data analysis is ongoing” in those bird studies.
The NRDA process has some drawbacks, however. Muth said “we do not do a great job as nation of keeping track of wildlife so we’re missing baseline or pre-spill data to assess what the spill did.” And he said ” there is a structural problem with the best way NRDA is arrange. It takes a awhile to get research projects approved.”
In NRDA studies, government and university scientists collaborate with BP representatives. The oil company is also gathering its own information on the spill’s impact on birds, other wildlife and fish. Muth said “results of many of those studies won’t be released until the BP trial starts in January because they will be used as evidence by the different sides.” After its Gulf well exploded, BP hired Houston-based environmental contractor Cardno ENTRIX to provide consulting on NRDA and the spill response. Cardno ENTRIX employees have represented BP in NRDA studies.
As to whether oil should have been removed from birds in the course of the spill, Muth said cleaned birds were tagged, and NRDA studies are expected to offer details about survival rates. In 2010, European scientists warned that birds cleaned of oil would only die soon afterward, and the World Wildlife Fund also questioned the practice.