San Francisco Estuary Midwinter Waterfowl Survey: 2012 Survey Results and Trend Analysis (1981-2012)
The SF Estuary had a large proportion of the Lower Pacific Flyway count for diving ducks (tribes Aythyini, Mergini and Oxyurini): 60% for greater and lesser scaup, 54% for scoter spp., 51% for canvasback, 36% for ruddy duck and 32% for bufflehead.