Phalacrocorax auritus, Double-crested cormorant

Phalacrocorax auritus   (Lesson, 1831)

Double-crested cormorant
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Classification / Names Populärnamn | synonymer | CoL | ITIS | WoRMS

Aves | Pelecaniformes | Phalacrocoracidae

Environment: milieu / climate zone / djupintervall / distribution range Ekologi

; sötvatten; brackvatten.  Tropical

Distribution Länder | FAO områden | Ekosystem | Förekomster | Utplanteringar

Western Atlantic and Eastern Pacific. Tropical to boreal.

Length at first maturity / Size / Weight / Age

Könsmognad: Lm ?  range ? - ? cm Max length : 90.0 cm TL hane/ej könsbestämd; (Ref. 94965); publicerad maxvikt: 2.6 kg (Ref. 356)

Short description Morfologi

Goose-sized; black overall; long neck and tail; has webbed feet that connects its four toes, allowing it to cling to rocky cliffs and feed on shoaling fish (Ref. 94965).

Biologi     Ordlista (t.ex. epibenthic)

A coastal species found <50 km offshore (Ref. 356). Nests in the interior of the North American continent and along the coast (Ref. 63805); on unvegetated, rocky outcroppings (Ref. 95237). Are common to abundant winter residents in freshwater and estuarine habitats in the state of Texas (Ref. 95239). Started to colonize the Great Lakes at the beginning of this century, on Lake Superior in 1913-20, and Lake Huron in 1932, returning each season and nesting from April until late September where they form dense colonies in trees or on the ground on small rocky islands. Lake Ontario supported 24% of the breeding population in 1991, and the largest colony of 5,428 nests on Little Galloo Island. Most begin to breed at 3 years of age (Ref. 95240). An opportunistic feeder (Ref. 95224). Exhibits plunge diving (Ref. 356). Generally preys on fish, often feeding in shallow waters (Ref. 95238). Feeds in river estuaries; on out-migrating juvenile salmonids (Oncorhynchus spp.) in the Columbia Basin (Ref. 95220); on alewife (Alosa pseudoharengus) and southeastern catfish (Ictalurus punctatus) (Ref. 95237); on crayfish (Orconectes sp.) (Ref. 95238); on shad (Dorosoma spp.) and sunfishes (Lepomis spp.) (Ref. 60211); on striped mullet (Mugil cephalus) and Gulf menhaden (Brevoortia patronus) in Lavaca Bay; striped mullet and Gulf toadfish (Opsanus beta) in upper Laguna Madre; typically targetting benthic fish or small schooling fishes and forage species (Ref. 95239). Average flight speed recorded at 61 km/h. (Ref. 95241). Preyed on by the bald eagle, Haliateeus leucocephalus (Ref. 95220).

Life cycle and mating behavior Könsmognad | Reproduktion | Lek | Eggs | Fecundity | Larvae

Main reference referenser | Koordinator | Medarbetare

Lepage, D. 2007 Avibase -the World Bird Database. http://www.bsc-eoc.org/avibase/avibase.jsp [accessed 09/07/2007]. (Ref. 7816)

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

  Least Concern (LC) ; Date assessed: 09 August 2018

CITES status (Ref. 108899)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Human uses


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Ytterligare information

Trophic Ecology
Food items (preys)
Födosammansättning
Födointag
Predatorer
Ekologi
Ekologi
Population dynamics
Tillväxt
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversion
Abundans
Life cycle
Reproduktion
Könsmognad
Fecundity
Lek
Eggs
Egg development
Larvae
Distribution
Länder
FAO områden
Ekosystem
Förekomster
Utplanteringar
Physiology
Syreförbrukning
Human Related
Stamps, coins, misc.
Outreach
Medarbetare
Taxonomy
Populärnamn
synonymer
Morfologi
Bilder
referenser
referenser

Internet-källor

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, sök) | Zoological Record

Estimates based on models

Preferred temperature (Ref. 115969): 4.5 - 28.1, mean 12.2 (based on 1418 cells).
Resiliens (Ref. 69278): Hög, lägsta populationsfördubblingstid mindre än 15 månader (K=9.28-23.13).
Fishing Vulnerability (Ref. 71543): High vulnerability (56 of 100).

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