Advertisement

You can sponsor this page

Larus occidentalis   Audubon, 1839

western gull

Native range | All suitable habitat | Point map | Year 2100
This map was computer-generated and has not yet been reviewed.
Larus occidentalis   AquaMaps   Data sources: GBIF OBIS
Upload your photos and videos
| All pictures | Google image |

No photo available for this species.

Classification
Aves | Ciconiiformes | Laridae
Common names | Synonyms | CoL | ITIS | WoRMS

Main reference
Schreiber, R.W. 1970. (Ref. 80153)
References | Biblio | Coordinator | Collaborators

Size / Weight / Age
Max length : 68.0 cm TL male/unsexed; (Ref. 8812); max. published weight: 1.0 kg (Ref. 356)

Environment
Others

Climate / Range
Temperate

Distribution
Eastern Pacific and Western Atlantic. Subtropical to temperate.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description
Culmen: 5.56 cm; tarsus: 7.197 cm; wing: 41.2 cm.

Biology     Glossary (e.g. epibenthic)

Total Length: 61 to 68 cm; Wingspan: 132 to 142 cm (Ref. 8812). Occupies the continental shelf; <80 km (Ref. 356). Scavengers; exhibits kleptoparasitism (Ref. 356). Opportunistic feeders that eat a wide variety of food. 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. Switch in diet from garbage to fish when chicks hatch for its higher nutritional content to assure higher fledging success. Early breeding and early egg-laying assures higher fledging success for this species. On the Farallon Islands, California, high nest failures recorded during ENSO (El Niño) events; severe events in 1982-1983 causing adult mortality. (Ref. 87784).

IUCN Red List Status (Ref. 114614)

CITES status (Ref. 94142)

Not Evaluated

Threat to humans




Human uses

| FisheriesWiki |

More information

Common names
Synonyms
Predators
Reproduction
Maturity
Spawning
Eggs
Egg development
Age/Size
Growth
Length-weight
Length-length
Morphology
Larvae
Abundance
References
Mass conversion

Internet sources
BHL | BOLD Systems | Check for other websites | Check FishWatcher | CISTI | DiscoverLife | FAO(Publication : search) | GenBank (genome, nucleotide) | GOBASE | Google Books | Google Scholar | Google | ispecies | PubMed | Scirus | FishBase | Tree of Life | uBio | uBio RSS | Wikipedia (Go, Search) | Zoological Record

Estimation of some characteristics with mathematical models

Vulnerability (Ref. 71543)
Moderate to high vulnerability (47 of 100)
Price category (Ref. 80766)
Unknown