Abstract
Double-crested cormorants (Phalacrocorax auritus) have been the subject of increased research throughout North America in recent years, primarily as a result of conflicts with sport and commercial fisheries (Nettleship and Duffy 1995; Hatch and Weseloh 1999; Tobin 1999). In the Pacific Northwest, attention has been focused on the consumption of juvenile salmonids by double-crested cormorants in the Columbia River estuary (Collis and others 2002; Roby and others 2003; Anderson and others 2004). Most cormorant research has addressed food habitats, foraging patterns, and productivity. Little information is available concerning migration patterns and long-term movements of west coast cormorants. Erwin
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