FILE - This July 19, 2010 photo released by the Point Reyes Bird Observatory and NOAA shows a krill from the Gulf of the Farallones National Marine Sanctuary off the Northern California coast. Millions of krill, a tiny shrimp-like animal that is a cornerstone of the ocean food web, have been washing up on beaches in Southern Oregon and Northern California the past few weeks and scientists are not sure why. (AP Photo/PRBO/NOAA, Sophie Webb, file)
FILE - This July 19, 2010 photo released by the Point Reyes Bird Observatory and NOAA shows a krill from the Gulf of the Farallones National Marine Sanctuary off the Northern California coast. Millions of krill, a tiny shrimp-like animal that is a cornerstone of the ocean food web, have been washing up on beaches in Southern Oregon and Northern California the past few weeks and scientists are not sure why. (AP Photo/PRBO/NOAA, Sophie Webb, file)
This undated photo from NOAA Fisheries Service shows a species of Pacific krill. Millions of the inch-long shrimp-like animals have been washing up on beaches between Eureka, Calif., and Newport, Ore., and scientists don't exactly know why. Strong winds may have pushed them ashore while they were mating near the surface, or they may have run into an area of low oxygen. (AP Photo/NOAA, Jaime Gomez Gutierrez)
GRANTS PASS, Ore. (AP) ? Millions of krill ? a tiny shrimp-like animal that is a cornerstone of the ocean food web ? have been washing up on beaches in Southern Oregon and Northern California for the past few weeks.
Scientists are not sure why.
National Oceanic and Atmospheric Administration oceanographer Bill Peterson says they may have been blown into the surf by strong winds while mating near the surface, and then been dashed on the beach.
The species is Thysanoessa spinifera. They are about an inch long and live in shallower water along the Continental Shelf. They have been seen in swaths 5 feet wide, stretching for miles on beaches from Bodega Bay, Calif., to Newport, Ore. Some were still alive.
"There has definitely been something going on," Peterson said from Newport. "People have sent us specimens. In both cases, the females had just been fertilized. That suggests they were involved, maybe, in a mating swarm. But we've had a lot of onshore wind the last two weeks. If they were on the surface for some reason and the wind blows them toward the beach and they are trapped in the surf, that is the end of them."
Or, they may have fallen victim to low levels of oxygen in the water, said Joe Tyburczy, a scientist with California Sea Grant Extension in Eureka. A recent ocean survey showed lower than normal oxygen levels in some locations. If the krill went to the surface to get oxygen, they could have been blown on shore, he said.
For some reason, people did not see gulls and other sea birds eating them, he added.
Peterson said low oxygen conditions, known as hypoxia, are a less likely explanation because they normally occur later in the summer.
The mass strandings are unusual, but not unheard of, Peterson added. There is no way to tell yet whether this represents a significant threat to a source of food for salmon, rockfish, ling cod and even whales.
The story was reported Thursday by The World.
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