Thursday, 23 March 2017

After Deepwater Horizon spill: Which animals weathered the disaster




Scientists construct a food web of heavily oiled marshes in Barataria Bay, Louisiana

Date: March 13, 2017
Source: Rutgers University

A new study from a Coastal Waters Consortium team of researchers led by Rutgers University postdoctoral researcher, Michael McCann, has found which birds, fish, insects and other animals affected by the Deepwater Horizon explosion should be given top priority for conservation, protection and research.

Until now scientists didn't know which kinds of animals were most affected and what impact their collective fates had on the food chain after the offshore oil rig Deepwater Horizon exploded in 2010 and dumped 4.9 million barrels of oil into Louisiana's salt marshes.

"There were lots of studies about who eats whom, and about what species are sensitive to oil," says Olaf Jensen, professor of marine and coastal sciences in the School of Environmental and Biological Sciences, and co-author of the study. "We put those together and asked, 'Who is both important in the food web and really sensitive to oil?'" These are the species most in need of protection because their loss can have ripple effects throughout the food chain, said Jensen.

The study, published this month in Frontiers in Ecology and the Environment, in which the team of scientists from Rutgers University, Louisiana State University, Louisiana Universities Marine Consortium, University of North Carolina, East Carolina University, and Stony Brook University constructed a marsh food web for Barataria Bay, Louisiana. The study found that killifish played a key role in the food web and fared relatively well in the wake of the spill.

The researchers determined that terns, gulls and wading birds, such as herons, were both sensitive to oil and so extensively connected to other animals as prey and predator that their loss would impact other species in the food chain. Some studies indicate that the mortality among terns and gulls in Barataria Bay was as high as 32 percent.

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