Posted on May 5, 2013 by Bob Berwyn
UC Davis scientist Andrew Whitehead collects fish at a field site in May 2010, weeks after the April Deepwater Horizon oil spill. A 2013 study he co-authored shows killifish at oil-impacted sites continue to develop health defects, three years after the spill. Photo courtesy Pat Sullivan.
Fish embryos exposed to oil show developmental abnormalities
By Bob Berwyn
FRISCO —Small fish living in coastal Louisiana waters were sickened by crude oil toxicity for more than a year after the Deepwater Horizon oil spill in the Gulf of Mexico, according to researchers from Lousiana, California and South Carolina.
Oil collected from the spill in 2011 continues to show toxic effects in the lab, suggesting there’s a risk of multi-generational exposure, according to Andrew Whitehead, a University of California, Davis, scientist who co-authored the study of killifish, considered an indicator species for coastal ecosystems.
Killifish embryos exposed to sediments from oiled locations in 2010 and 2011 show developmental abnormalities, including heart defects, delayed hatching and reduced hatching success. Continue reading
Filed under: BP Gulf oil spill, Environment | Tagged: Deepwater horizon oil spill, Environment, Gulf of Mexico, killifish, oil pollution | 2 Comments »
Posted on December 1, 2012 by Bob Berwyn
Small grazers at the base of the food chain most directly affected
Followup studies after the 2010 Deepwater Horizon oil spill call into question the extensive use of chemical dispersants. Photo courtesy NOAA.
By Summit Voice
FRISCO — The massive amounts of oil that spilled into the Gulf of Mexico after BP’s Deepwater Horizon drill rig exploded was devastating to marine life, but the dispersant used in the aftermath to try and break down the oil slicks may have been even worse for some species, according to new research done by scientists with the Georgia Institute of Technology and Universidad Autonoma de Aguascalientes, Mexico.
Based on laboratory toxicity tests, the study found that the oil-dispersant mix was up to 52 times more toxic to tiny rotifers, microscopic grazers at the base of the Gulf’s food chain.
The researchers tested a mix oil from the spill and Corexit, the dispersant required by the Environmental Protection Agency for clean up, on five strains of rotifers. Rotifers have long been used by ecotoxicologists to assess toxicity in marine waters because of their fast response time, ease of use in tests and sensitivity to toxicants. Continue reading
Filed under: BP Gulf oil spill, Environment, Marine biology, ocean conservation, oil drilling | Tagged: Corexit, Deepwater Horizon, Dispersant, Environment, oil pollution, Oil spill | 3 Comments »