In terrible news for the Nigerian delta and the Gulf of Mexico, new
research from the University of California Davis suggests that oil is even more toxic
than previously thought. Researchers at the university's Bodega Marine
Laboratory studied the aftermath of an oil spill in San Francisco Bay in
2007, when the tanker Cusco Busan hit the Bay Bridge and leaked 54,000
gallons of oil into the bay. When the team examined the spill's effect
on the embryos of Pacific herring, they found that they disintegrated
when hit by UV rays, like the ones emitted by the sun. Why is that?
Well, the phenomenon is due to phototoxicity,
a condition similar to sunburns that often arises when humans on
certain kinds of medicine are exposed to sunlight. When oil enters the
food chain, fish such as herring absorb it and pass the chemical on to
their spawn. If those embryos have high levels oil in them, the chemical
reaction that occurs after being expose to sunlight causes them to die.
Circle of life = broken.
Until now, environmental assessments of oil spills didn't include
phototoxicity in their analyses of how toxic each spill was. If the
phenomenon holds true across different species of fish and different
locations, than efforts to rebuild fish populations after the BP oil
spill in the Gulf of Mexico in 2010 could prove to be even more
difficult than they already are. Lord knows what this means for fish
stocks in Nigeria.
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