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 Jerónimo 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 Martín 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).
Rights Holder: International Union for Conservation of Nature and Natural Resources
Bibliographic Citation: BirdLife International 2014.
Synthliboramphus scrippsi. In: IUCN 2014 . IUCN Red List of Threatened Species. Version 2014.1 . <
www.iucnredlist.org>
