IUCN threat status:

Vulnerable (VU)


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Range Description

Synthliboramphus scrippsi breeds on islands off southern California, USA (San Miguel, Santa Cruz, Anacapa, Santa Barbara, San Clemente, and, formerly, Santa Catalina) and western Baja California, Mexico (San Benito, and the Coronado and San Jernimo islands) (Chesser et al. 2012). On large islands the species is confined largely or entirely to offshore rocks (Drost and Lewis 1995). Breeding on San Martn and Cedros islands, Baja California, is uncertain (Chesser et al. 2012). In the USA, an estimated 885-2,575 breeding pairs occur, the biggest colony on the island of Santa Barbara holds 500-1,250 pairs (B. Keitt and D. Whitworth in litt. 2003). Small numbers breed on Anacapa (200-600 pairs), Santa Cruz (100-300 pairs), San Miguel (50-300 pairs), and San Clemente islands (10-50 pairs), USA (Sowls et al. 1980, Hunt et al. 1981, Carter et al. 1992, Drost and Lewis 1995). The Santa Barbara colony has been stable since the 1980s, but may have declined since the turn of the century (B. Keitt and D. Whitworth in litt. 2003). The species winters offshore from northern California (rarely) south to southern Baja California (Chesser et al. 2012). Some post-breeding birds reach Oregon, USA, and British Columbia, Canada (Gaston and Jones 1998, Karnovsky et al. 2005).


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© International Union for Conservation of Nature and Natural Resources

Source: IUCN

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