Three gull colonies below the confluence of the Snake and Columbia rivers increased substantially, however. delawarensis) declined during the study, mostly because of the abandonment of a large colony in the mid-Columbia River. Overall numbers of breeding California gulls ( Larus californicus) and ring-billed gulls ( L. Numbers of American white pelicans ( Pelecanus erythrorhynchos) increased at Badger Island, the sole breeding colony for the species on the Columbia Plateau, from about 900 individuals in 2007 to over 2,000 individuals in 2010. ![]() Numbers of nesting Caspian terns ( Hydroprogne caspia) and double-crested cormorants ( Phalacrocorax auritus) were stable at about 700–1,000 breeding pairs at five colonies and about 1,200–1,500 breeding pairs at four colonies, respectively. ![]() We investigated colony size, productivity, and limiting factors for five piscivorous waterbird species nesting at 18 locations on the Columbia Plateau (Washington) during 2004–2010 with emphasis on species with a history of salmonid ( Oncorhynchus spp.) depredation.
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