Larus occidentalis, Western gull

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Larus occidentalis Audubon, 1839

Western gull

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Classification / Names आम नाम | उपशब्द | CoL | ITIS | WoRMS

Aves | Charadriiformes | Laridae

Environment: milieu / climate zone / गहराई सीमा / distribution range पारिस्थितिकी

. Temperate

Distribution देश | ऐफ ऐ ओ क्षेत्र | Ecosystems | संयोग | भूमिका

Eastern Pacific and Western Atlantic. Subtropical to temperate.

Length at first maturity / आकार / Weight / Age

परिपक्व अवधि: L_m ? range ? - ? cm Max length : 68.0 cm TL पुल्लिंग / अलिंग; (संदर्भ 8812); अधिकतम प्रकाशित वज़न: 1.0 kg (संदर्भ 356)

Short description आकृति विज्ञान

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

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).

Life cycle and mating behavior परिपक्व अवधि | पुनरुत्पत्ति | मछलीऔ का अंडे देना | Eggs | Fecundity | Larvae

Main reference संदर्भ | संयोजक | सहयोगीयो

Schreiber, R.W. 1970. (संदर्भ 80153)

IUCN Red List Status (संदर्भ 130435: Version 2024-2)

Least Concern (LC) ; Date assessed: 08 August 2018

CITES status (संदर्भ 108899)

Not Evaluated

CMS (संदर्भ 116361)

Not Evaluated

Threat to humans

Human uses

| FishSource |

साधन

E-book | कार्यक्षेत्र पथप्रदर्शक

अधिक जानकारी

Trophic Ecology

खाद्य पदार्थ
संघटक आहार
आहार खपत
Food rations
परभक्षी

पारिस्थितिकी

Population dynamics

बाढ़
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversion
भर्ती
बहुतायत

Life cycle

पुनरुत्पत्ति
परिपक्व अवधि
Fecundity
मछलीऔ का अंडे देना
Eggs
Egg development
Larvae
लारवल गतिकी

Distribution

देश
ऐफ ऐ ओ क्षेत्र
Ecosystems
संयोग
भूमिका

Human Related

Aquaculture profiles
Stamps, coins, misc.

Outreach

सहयोगीयो

Taxonomy

आम नाम
उपशब्द
आकृति विज्ञान
तस्वीरे

संदर्भ

इंटरनेट स्रोत

Estimates based on models

Preferred temperature (Ref. 115969): 5.4 - 18.5, mean 8.3 (based on 112 cells).

लौटाव (Ref. 69278): ऊंचा, न्यूनतम जनसंख्या दुगनी समय अवलागत 15 महीने। (K=16.74-39.08).

Vulnerability (संदर्भ 71543): Moderate to high vulnerability (47 of 100).

Price category (संदर्भ 80766): Unknown.

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