Cassin's Auklet (Ptychoramphus aleuticus) chick at Año Nuevo Island, California, USA, and multiple habitat management methods: ceramic artificial burrow designed specifically for Cassin's Auklets, restored native vegetation, and 2009 — Scorpion Rock habitat restoration and monitoring for Cassin’s Auklets EXECUTIVE SUMMARY In 2007 and 2008, population monitoring of Cassin’s Auklet (Ptychoramphus aleuticus) continued at Scorpion Rock Although forested sites with soft soils and large downed wood provide preferred nesting habitat, tussock grass communities on bluffs are also exploited as Each species account is written by leading ornithologists and provides detailed information on bird distribution, migration, habitat, diet, sounds, behavior, breeding, current population status, and conservation.

Conservation. Unlock thousands of full-length species accounts and hundreds of bird family overviews when you subscribe to Birds of the World. Cassin's Auklet (Ptychoramphus aleuticus) chick at Año Nuevo Island, California, USA, and multiple habitat management methods: ceramic artificial burrow designed specifically for Cassin's Auklets, restored native vegetation, and the custom sea lion exclusion fence in the background. Cassin's Auklet: Breeds from the Aleutians down the Pacific Coast of North American to central Baja California. Adams et al. Cassin's Auklet breeding population grew to 136 birds by 2014, despite population declines during 2005-2007 and 2016-2017 concurrent with reproductive failures and die-offs that affected Cassin's Auklets regionally. Pelagic, with preferred habitats consisting of open ocean; nests on sea cliffs and isolated headlands. The Cassin’s Auklet, Ptychoramphus aleuticus is a small (about 200g, or 7 oz) krill and larval fish-eating seabird that breeds along the West Coast of North America from Alaska south to Baja California, Mexico. Sociable at all seasons, feeding in flocks at sea and nesting in large colonies. One of the least known and most rarely seen of British Columbia’s seabirds, it … If any sites rank as high or moderate capability for Cassin’s Auklet - assume the species may be utilizing the area for nesting and implement protective measures. The. Reports also include heavy predation by Western Gulls (Thoresen 1964, Manuwal 1979, Nelson 1989) and some predation by Peregrine Falcons. Description. habitat. Cassin's Auklet is listed as Near Threatened on the IUCN Red List.Colonies are threatened by predators, especially introduced predators (cats, fox, rats), and grazing animals (goats).

There is little information on population trends of Cassin's Auklet, but the species appears to be declining. Winters in waters off the southern part of breeding range from southern British Columbia south.

Annual Population monitoring and habitat restoration for Cassin’s Auklets at Scorpion Rock and Prince Island, Channel Islands National Park, California: 2009–2011 Josh Adams 1, David Mazurkiewicz 2,3, A. Laurie Harvey 4 1 U.S To help us answer these questions, we began deploying miniature light-sensing archival tags (or geolocators) on Cassin’s The Cassin’s Auklet was among the most common prey found in a Bald Eagle nest in California (23 out of 297 birds were of this species) (Erlandsson et al. Cassin's Auklets nest in colonies ranging from dozens of birds up to hundreds of thousands, and are most dense on islands off Alaska and British Columbia. A majority of Marine Birds – Cassin’s Auklet Foraging Habitat data sources • Environment Canada (Canadian Wildlife Service) – Cassin’s Auklet Telemetry Data, 1999-2001 data resolution • It was estimated that the aerial surveys detected the

But where they go and what factors influence their choice of winter habitat remain a mystery. Cassin’s Auklet Ptychoramphus aleuticus is a member of a large successful family of seabirds, the auks (Alcidae), that inhabits the north Atlantic, Pacific, and Arctic oceans. Its small size makes it vulnerable to predators, so it visits its nesting colonies mainly under the protection of darkness. Cassin's Auklet nesting island, Southeast Farallon Is., CA, January. A small, dark seabird, nesting on islands along the Pacific Coast from Alaska to Mexico.

2007).