TRACE ELEMENTS AND ORGANOCHLORINES IN SURF SCOTERS FROM SAN FRANCISCO BAY, 1985 H A R R Y M. O H L E N D O R F 1 A N D K A T H E R I N E C. M A R O I S
U.S. Fish and Wildlife Service, Patuxent Wildlife Research Center, Pacific Coast Research Station, c/o Department of Wildlife and Fisheries Biology, University of California, Davis, CA 95616, U.S.A. ROY W. L O W E z A N D T H O M A S E. H A R V E Y 3
U.S. Fish and Wildlife Service, San Francisco Bay National Wildlife Refuge, P.O. Box 524, Newark, CA 94560, U.S.A. and P A U L R. K E L L Y 4
California Department ofFish and Game, P.O. Box 47, Yountville, CA 94599, U.S.A.
a Present address: CH2M Hill, 3840 Rosin Court, Suite 110, Sacramento, CA 95834, U.S.A. 2 Present address: U.S. Fish and Wildlife Service, Hatfield Marine Science Center, Newport, OR 97365, U.S.A. 3 Present address: U.S. Fish and Wildlife Service, 2800 Cottage Way, Sacramento, CA 95825, U.S.A. 4 Present address: California Department of Fish and Game, Non-game Heritage Program, 1416 Ninth Street (Room 1225), Sacramento, CA 95814, U.S.A.
(Received December 1989) Abstract. Surf scoters (Melanitta perspicillata) were collected from 6 locations in San Francisco Bay during January and March 1985. Overall, mean concentrations of cadmium and zinc were higher in livers of scoters from the southern region of the Bay, whereas mean iron and lead were higher in those from the northern Bay region. Mean concentrations of arsenic, copper, lead, zinc, aluminum (January only) and iron (January) also differed among individual locations. Mean concentrations of copper and zinc increased, arsenic decreased, and cadmium remained the same between January and March. Selenium and mercury concentrations in scoter livers were not significantly correlated (P >0.05), but cadmium concentrations in livers and kidneys were positively correlated (P