“It is the first study that has looked at Steller sea lion diets this deeply and consistently over several years at a time.'
SEWARD, Alaska - Steller sea lions aren’t the easiest mammals for scientists to monitor. Rookeries are often on remote rocky outposts like Chiswell Island near Resurrection Bay, where remote monitoring cameras were set up about 25 years ago to study the marine mammals’ population trends.A recent study authored by Alaska SeaLife Center scientist John Maniscalco in the journal “” studied Steller sea lions up close.
Prior to the heatwave when the waters were relatively cooler, Maniscalco found the Stellar sea lions preyed on shallow-water fish like capelin. Smaller, less nutrient-rich species like polychaetes, sand lance, sculpins and skates took the place of the fish. Maniscalco said researchers once thought that a highly-diverse diet was a good thing, but that’s only true in the summertime.
Researchers with the Alaska SeaLife Center studied the winter diets of Steller sea lions through the collection of scat samples in Resurrection Bay, Alaska.
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