Species fact sheet by Global Register of Migratory Species - www.groms.de

Ptychoramphus aleuticus (Pallas, 1811) Family: Alcidae Order: Charadriiformes Back
Cassin's auklet Aleutenalk Starique de Cassin Mérgulo sombrio
CMS NL Redlist 2000 (Criteria) NL CITES NL (Europe: SPEC threat status )
Migration: intracontinental fairly sedentary in the S

Ptychoramphus aleuticus

Winters mainly offshore within breeding range. S populations relatively sedentary, staying at sea in vicinity of colonies, often visiting colony at night in any month; birds from Alaska and British Columbia migratory, moving S along coast as far as California, where build-up of 500,000-1,000,000 birds occurs during autumn, numbers far exceeding total population from Washington to Baja California. Exodus from wintering areas begins as early as Dec, mostly later during Jan-Feb, with birds reaching N parts of range during Mar-Apr. In general, dispersal patterns and timing of spring influx and autumn exodus require additional study. Distribution largely determined by abundance of small crustaceans, squid and fish.
(del Hoyo J A Elliott; J Sargatal (eds) (1996) - www.hbw.com )

Regions: Mesoamerica, North America
Recommended link: http://www.enature.com/fieldguide/showSpeciesSH.asp?curGroupID=1&shapeID=959&curPageNum=22&recn um=BD0198
Feedback: mail to Klaus Riede
Explanatory notes
(Last update: 05.08.02 by E.Heuel)

Populations