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Cassin's Auklet Ptychoramphus aleuticus

IUCN Red List Criteria

Near Threatened (criteria nearly met) A2b+3b+4b 

IUCN Red List history

Year Category
2015 Near Threatened
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern

Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type   Average mass -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 123,000 medium
Number of locations -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 2500000-4999999 poor Estimated 2009
Population trend Decreasing Estimated -
Number of subpopulations - - -
Largest subpopulation - - -
Generation length (yrs) 7.6 - - -
Population justification: The total population is estimated to be at least 3,600,000 breeding birds (Nettleship 1996) which equates to approximately 5,400,000 individuals.
Trend justification: This species has apparently undergone a large and statistically significant decrease over the last 40 years in North America (-96.8% decline over 40 years, equating to a -57.9% decline per decade; data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007, although these surveys cover less than 50% of the species's range in North America). A recent study by Rodway and Lemon (2011) found declines in monitored burrows at several colonies in British Columbia, and estimated a 40% decline in monitored burrows over 20 years between 1989 and 2009 in the largest known breeding population on Triangle Island (part of the Scott Islands). Declines appear to have begun in c.1990, and if the declines on Triangle Island are representative of the whole Scott Islands population then there could have been a total loss of approximately 800,000 birds in the region, or >20% of the world breeding population. Large-scale declines have also been documented on the South Farallon Islands, California (H. Carter in litt. 2013). The overall rate of decline is currently placed in the band 20-29% in three generations (23 years), but confirmation that similar declines are taking place across the whole range would lead to the overall rate of decline being increased.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Canada Native Extant Yes      
Mexico Native Extant       Yes
USA Native Extant Yes      

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Canada Anthony Island site factsheet
Canada Englefield Bay Islands site factsheet
Canada Frederick Island site factsheet
Canada Hippa Island site factsheet
Canada Kerouard and St. James Islands site factsheet
Canada Moore and Byers Islands and Banks site factsheet
Canada Ramsay and Northern Juan Perez Sound Islands site factsheet
Canada Rankine and Langtry Islands site factsheet
Canada Scott Island Group site factsheet
Canada Skincuttle Inlet Islands site factsheet
Canada Solander Island and Brooks Bay site factsheet
USA Amagat & Umga Island Colonies site factsheet
USA Castle Rock site factsheet
USA Castle Rock Colonies site factsheet
USA Cherni Island Complex Colonies site factsheet
USA Forrester Island Colonies site factsheet
USA Gulf of Alaska Shelf 155W57N site factsheet
USA Olympic Continental Shelf site factsheet
USA Shumagin Islands Marine site factsheet
USA Trinidad Complex site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands Major breeding
Marine Neritic Macroalgal/Kelp Major resident
Marine Neritic Pelagic Major resident
Marine Neritic Seagrass (Submerged) Major resident
Marine Neritic Subtidal Loose Rock/pebble/gravel Major resident
Marine Neritic Subtidal Rock and Rocky Reefs Major resident
Marine Neritic Subtidal Sandy Major resident
Marine Neritic Subtidal Sandy-Mud Major resident
Marine Oceanic Epipelagic (0-200m) Suitable resident
Marine Oceanic Mesopelagic (200-1000m) Suitable resident
Altitude 0 - 100 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Marine & freshwater aquaculture / Industrial aquaculture Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation
Biological resource use Fishing & harvesting aquatic resources / Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Biological resource use Logging & wood harvesting / Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation
Climate change & severe weather Temperature extremes Timing Scope Severity Impact
Ongoing Majority (50-90%) Causing/Could cause fluctuations Medium Impact: 6
Stresses
Reduced reproductive success, Species mortality
Energy production & mining Renewable energy Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Human intrusions & disturbance Recreational activities Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species disturbance, Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Black Rat (Rattus rattus) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Brown Rat (Rattus norvegicus) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Domestic Cat (Felis catus) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / European Rabbit (Oryctolagus cuniculus) Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Goat (Capra hircus) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species disturbance, Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Procyon lotor Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Red Fox (Vulpes vulpes) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Problematic native species/diseases / Haliaeetus leucocephalus Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Problematic native species/diseases / Larus occidentalis Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Problematic native species/diseases / Problematic native species/diseases / Peregrine Falcon (Falco Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Pollution Excess energy / Light pollution Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Pollution Industrial & military effluents / Oil spills Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem conversion

Utilisation

Purpose Primary form used Life stage used Source Scale Level Timing
Food (human) Whole Adults and juveniles Wild Subsistence, National Non-trivial Historical
Food (human) Whole Eggs Wild Subsistence, National Non-trivial Historical
Food - human - - - Subsistence, National

Recommended citation
BirdLife International (2016) Species factsheet: Ptychoramphus aleuticus. Downloaded from http://www.birdlife.org on 10/02/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 10/02/2016.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Near Threatened
Family Alcidae (Auks)
Species name author (Pallas, 1811)
Population size 2500000-4999999 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 123,000 km2
Country endemic? No
Links to further information
- Summary information on this species