Cerorhinca monocerata, Rhinoceros auklet

Cerorhinca monocerata   (Pallas, 1811)

Rhinoceros 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 - 60 m (Ref. 62269).  Temperate; 62°N - 28°N, 119°E - 115°W

Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions

Northern, Western and Eastern Pacific Ocean. Boreal to subtropical.

Length at first maturity / Size / Weight / Age

Maturity: Lm ?  range ? - ? cm Max length : 38.0 cm TL male/unsexed; (Ref. 8812); max. published weight: 520.00 g (Ref. 356)

Short description Morphology

Culmen: 3.45 cm; tarsus: 3.0 cm; wing: 15.24 cm.

Biology     Glossary (e.g. epibenthic)

Total Length: 35 to 38 cm (Ref. 8812). Pursuit diver; coastal; <50 km (Ref. 356). On the Farallon Islands, this species usurps nests of smaller Cassin's Auklet by destroying eggs or chicks thereby effectively lowering its habitat competitor's reproductive success. Nest site prospecting at night. Diurnal, particularly where Auklets nest in caves, but completely nocturnal where Bald Eagle colonies are present. Based on stable isotope analysis (SIA) diet study of egg albumin, belongs to higher N signature group (based on ratios of stable isotopes of nitrogen and carbon): piscivorous (Ref. 87784).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference References | Coordinator | Collaborators

Watanuki, Y. 1987 Breeding biology and foods of Rhinoceros Auklets on Teuri Island, Japan. Proceedings of the NIPR Symposium on Polar Biology 1:175-183. (Ref. 4542)

IUCN Red List Status (Ref. 130435: Version 2025-1)

  Least Concern (LC) ; Date assessed: 07 August 2018

CITES status (Ref. 108899)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Human uses


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Ecology
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Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
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Abundance
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Maturity
Fecundity
Spawning
Eggs
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Larvae
Distribution
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Introductions
Physiology
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Human Related
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Taxonomy
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References
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): 6.1 - 17.6, mean 9.7 (based on 690 cells).
Resilience (Ref. 69278): High, minimum population doubling time less than 15 months (K=9.33-35.4).
Fishing Vulnerability (Ref. 71543): Low to moderate vulnerability (28 of 100).
Price category (Ref. 80766): Unknown.

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