Navigation Links
Exxon Valdez oil found in tidal feeding grounds of ducks, sea otters

Seventeen years after the Exxon Valdez ran aground in Alaska’s Prince William Sound, compelling new evidence suggests that remnants of the worst oil spill in U.S. history extend farther into tidal waters than previously thought, increasing the probability that the oil is causing unanticipated long-term harm to wildlife. The finding appears today on the Web site of the American Chemical Society’s journal, Environmental Science & Technology.

The study, by research chemist Jeffrey Short and colleagues at the National Marine Fisheries Service in Juneau, Alaska, is also scheduled to appear in the June 15 print issue of the journal.

"This study shows that it is very plausible that exposure to Exxon Valdez oil is having a material impact on many shore-dwelling animals and is contributing to their slow recovery in some parts of Prince William Sound," Short says. "Sea otters, for instance, have yet to re-inhabit Herring Bay, the most oiled bay we studied, and the population of otters elsewhere around northern Knight Island continues to decline. Unfortunately, because much of this oil is buried in beach sediments and not exposed to weathering and other elements that might degrade it, it could remain hazardous to wildlife for decades."

The Exxon Valdez stuck an underwater rock formation on March 24, 1989, spilling 11 million gallons of heavy crude oil into the Sound over the next several days. Despite massive clean-up efforts, Short estimates about six miles of shoreline is still affected by the spill and as much as 100 tons of oil lingers in the Sound.

In their study, Short and his colleagues found significant amounts of Exxon Valdez oil buried in sand and silt that only becomes dry during the lowest tides. This biologically diverse zone is a prime feeding ground for sea otters, ducks and other wildlife.

Previously, scientists believed most of the oil was deposited on beaches at higher tide levels.>

The researchers randomly dug 662 pits along 32 stretches of shoreline on northern Knight Island, one of the earliest and worst affected areas during the spill. They found Exxon Valdez oil at 14 of the 32 sites. Although oil was spread throughout the tidal range, about half of it was found in the low tide zone, where predators could encounter it while searching for prey. More than 90 percent of the surface oil and all of the subsurface oil was from the Exxon Valdez, Short says.

Based on these findings, the researchers estimated that in a given year, a sea otter ?digging three pits a day searching for clams and other prey ?would probably come into contact with Exxon Valdez oil at least once every two months. However, sea otters dig thousands of pits a year, and Short suspects they actually could be encountering oil far more often than estimated.


'"/>

Source:American Chemical Society


Related biology news :

1. New component of the brakes on nerve regeneration found
2. Strongest proof yet found for prion hypothesis
3. A puzzle piece found in unraveling the wiring of the brain
4. New World founders small in number
5. Norovirus found to cause travelers diarrhea
6. Pair of cancer genes found to drive both cell migration and division
7. Alien woodwasp, threat to US pine trees, found in N.Y.
8. Achilles heel of the herpes virus possibly found
9. Purdue scientists may have found key to halting spinal cord damage
10. Unexpected lock and key mechanism found for the assembly of tumor blood vessels
11. New protein vital for immune response is found in surprise location
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:5/20/2016)... , May 20, 2016  VoiceIt is ... partnership with VoicePass. By working together, ... experience.  Because VoiceIt and VoicePass take slightly different ... engines increases both security and usability. ... excitement about this new partnership. "This ...
(Date:5/12/2016)... 2016 WearablesResearch.com , a brand of ... results from the Q1 wave of its quarterly wearables ... consumers, receptivity to a program where they would receive ... insurance company. "We were surprised to see ... Michael LaColla , CEO of Troubadour Research, "primarily because ...
(Date:5/3/2016)...  Neurotechnology, a provider of high-precision biometric identification ... Identification System (ABIS) , a complete system for ... can process multiple complex biometric transactions with high ... face or iris biometrics. It leverages the core ... MegaMatcher Accelerator , which have been used in ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... , June 23, 2016  Blueprint Bio, a company ... to the medical community, has closed its Series A ... Nunez . "We have received a commitment ... capital we need to meet our current goals," stated ... us the runway to complete validation on the current ...
(Date:6/23/2016)... Francisco, CA (PRWEB) , ... June 23, 2016 ... ... (EDC) software, is exhibiting at the Pennsylvania Convention Center and will showcase its ... Annual conference. ClinCapture will also be presenting a scientific poster on Disrupting Clinical ...
(Date:6/23/2016)... , June 22, 2016  Amgen (NASDAQ: ... of the QB3@953 life sciences incubator to ... health. The shared laboratory space at QB3@953 was created ... a key obstacle for many early stage organizations - ... of the sponsorship, Amgen launched two "Amgen Golden Ticket" ...
(Date:6/22/2016)... 22, 2016 Research and Markets has announced ... report to their offering. ... from $29.3 billion in 2013. The market is expected to grow ... 2015 to 2020, increasing from $50.6 billion in 2015 to $96.6 ... during the forecast period (2015 to 2020) are discussed. As well, ...
Breaking Biology Technology: