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Sea lions' disappearance from Pier 39 unusual
by Jaspreet Virk - December 30, 2009 - comments
According to sea scientists, there is a possibility that their number has plummeted due to change in food supply and water temperature
New York, December 30 -- Pier 39 in San Francisco is well known for the multitude of fun with attractions and live entertainment. But one of its attractions, the sea lions, which have for two decades amused all ages, have suddenly disappeared.
Late October, the scientists had counted a record number of sea lions, over 1700, occupying the docks Fisherman's Wharf.
The number had baffled scientists who questioned, why so many? The question still remains, but this time it is: where have they vanished?
On Nov. 21, the scientist had counted 927 sea lions. Seven days later, there were just 20 in number.
Cause of disappearance unclear
The disappearance of the sea lions is unusual, because their number usually increases in late fall and many of them stick around during the winters before heading south during the summers.
According to sea scientists, there is a possibility that their number has plummeted due to change in food supply and water temperature. But there is no clear evidence regarding the cause of their sudden disappearance.
Joe Cordero, a biologist with the National Marine Fisheries Service, told Sans Francisco Chronicle, “It's hard to say why they've departed. As to when and if they come back, no one can say. It's puzzling."
History of sea lions at PIER 39
The disappearance of the mammals is as strange as their initial appearance at the docks in 1989.
Initially, they were viewed as a nuisance with boat owners trying to avoid mammals weighing 100 to 1000 pounds.
The safety of the boat owners was the main concern. Other concerns included the noise, the stench and damaged property.
Over the time, the boat owners became accustomed to their presence, and the mammals were often seen sleeping at the surface of the calmer bay waters or sprawling at the docks.
Eventually, large open spaces were left for the sea lions and even when the boat returned to the dock no effort was made to discourage the sea lions from hauling out.
In fact, it became a common sight for sea lions to come at the bay, especially during winters when herrings were abundant food source.
Sea lions are migratory, and it’s natural for them to move about. Though their sudden disappearance has raised questions, it is hoped they have gone to their previous home at Seal Rocks and will return soon at the Pier 39.