San Francisco Chronicle: Fluctuating ocean conditions may be depleting the food supply of young sea lions that are turning up skinny and ill on California beaches. Peter Wallerstein, founder and president of the Whale Rescue Team in El Segundo, has rescued 240 marine mammals along South bay beaches so far this year, including a sea lion in Redondo Beach and two other sea lions in Manhattan Beach on Friday. “I’ve done more rescues this year than I have in my 25 years of doing this,” Wallerstein said. …