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biologists think an unseen oceanographic or environmental phenomenon is likely cutting the sea lion pups' supply of food, much like El Niño would.
Scientists still don't know why nearly 1,300 sickly sea lions have beached themselves on the shores of southern California since the beginning of the year. However, they think some weird oceanic phenomenon may be blocking off the sea lion pups' source of food, scientists reported today (April 17).
Toxic algae blooms and infectious disease outbreaks also can trigger mass pup strandings. Researchers don't have evidence that either of those factors are contributing to the problem this year, but scientists are still waiting to see if tests on blood and tissue samples turn up bacterial, viral and other infectious agents or radioactive traces.