“…In the northeastern PaciWc Ocean, killer whale abundance and population biology has been well documented at longterm study sites in Prince William Sound, southeastern Alaska, British Columbia, and Puget Sound Olesiuk et al 1990;Dahlheim et al 1997;Ford et al 2000). These studies have documented three sympatric forms (or ecotypes) of killer whales, named 'residents', 'transients', and 'oVshores', which diVer in morphology, ecology, behavior, and genetics ; Baird and Stacey 1988;Hoelzel and Dover 1991;Matkin and Saulitis 1994;BarrettLennard et al 1996;Ford et al 1998Ford et al , 2000Hoelzel et al 1998;Baird 2000). Notably, these ecotypes diVer markedly in their feeding specializations, with residents being primarily Wsh-eaters in contrast to transients that feed mainly on marine mammals (Ford et al 1998;Saulitis et al 2000;Herman et al 2005).…”