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Ptychoramphus - Species in
Alcidae - - Classification -
- Alcidae
- Charadriiformes
- Aves
- Chordata
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Ptychoramphus aleuticus (Pallas, 1811)
Cassin's auklet
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Classification / Names Common names | Synonyms | CoL | ITIS | WoRMS
Aves | Charadriiformes | Alcidae
Environment: milieu / climate zone / depth range / distribution range Ecology
Others; depth range 0 - 43 m (Ref. 65749), usually ? - 28 m (Ref. 61676). Polar; 62°N - 22°N, 171°E - 109°W (Ref. 125423)
Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions
Northwest and Eastern Pacific: From Aleutian Islands, Alaska, east to Canada and USA and south to Baja California, Mexico. Polar to subtropical.
Length at first maturity / Size / Weight / Age
Maturity: Lm ? range ? - ? cm Max length : 23.0 cm TL male/unsexed; (Ref. 8812); max. published weight: 188.00 g (Ref. 356)
Short description Morphology
Culmen: 1.92 cm; tarsus: 2.66 cm; wing: 14.8 cm.
Total Length: 20 to 23 cm (Ref. 8812). Relatively small bird with sperm-storage glands that allows delayed fertilization (Ref. 87784). Found along the continental shelf; <150 km. Exhibits plunge diving behavior (Ref. 356). Relatively small bird. Based on stable isotope analysis (SIA) diet study of egg albumin, belongs to lower N signature group (based on ratios of stable isotopes of nitrogen and carbon) indicating a more planktivorous diet, indicative of more pelagic foraging range. Copulation occurring ashore and ovum fertilization happens at sea; delayed fertilization possible because of sperm-storage glands; allows birds to feed at sea while egg forms and prior to the long period of fasting during egg incubation. Yolk formation occurs at sea where daily yolk deposition rapidly increases to a sharp peak. Double-brooded and can raise two broods annually. Reproductive success may be linked to long duration of pair bonds. Nest is usurped by the larger Pigeon Guillemot (Cepphus columba) and Rhinoceros Auklet (Cerorhinca monocerata) by the destruction of its eggs and chicks. ENSO event of 1982-1983 saw absence of returning birds to Farallon Is. In central California to breed, possibly due to the death of many older breeders. Reduced breeding rates and clutch size are the identified sublethal effects of exposure to oil from spill accidents (Ref. 87784).
Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Main reference
References | Coordinator | Collaborators
Gaydos, J.K. and N.A. Brown. 2009. (Ref. 94794)
IUCN Red List Status
(Ref. 130435: Version 2024-2)
Near Threatened (NT) (A2abce+3bce+4abce); Date assessed: 28 August 2020
CITES status (Ref. 108899)
Not Evaluated
CMS (Ref. 116361)
Not Evaluated
Threat to humans
Human uses
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More information
Trophic Ecology
Ecology
Population dynamics
Growth
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversion
Recruitment
Abundance
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversion
Recruitment
Abundance
Life cycle
Reproduction
Maturity
Fecundity
Spawning
Eggs
Egg development
Larvae
Larval dynamics
Maturity
Fecundity
Spawning
Eggs
Egg development
Larvae
Larval dynamics
Distribution
Human Related
Aquaculture profiles
Stamps, coins, misc.
Stamps, coins, misc.
Outreach
References
Internet sources
BHL | BOLD Systems | CISTI | DiscoverLife | FAO(Publication : search) | Fishipedia | GenBank (genome, nucleotide) | GloBI | Gomexsi | Google Books | Google Scholar | Google | PubMed | Tree of Life | Wikipedia (Go, Search) | Zoological Record
Estimates based on models
Preferred temperature
(Ref. 115969): 4.6 - 9.8, mean 6.8 (based on 152 cells).
Price category
(Ref. 80766):
Unknown.