Animalia > Chordata > Aves > Charadriiformes > Laridae > Larus > Larus schistisagus
 

Larus schistisagus (Slaty-backed Gull)

Wikipedia Abstract

The slaty-backed gull (Larus schistisagus) is a large white-headed gull that breeds on the western coast of Alaska but travels widely during nonbreeding seasons. It is similar in appearance to the western gull and the glaucous-winged gull. Another alternate name is Pacific gull, though this also applies to a southern hemisphere species, Larus pacificus. Claims have been made as to its (sometimes occasional) presence throughout North America as well as the eastern coast of Asia. On November 3, 2012, an individual was spotted in Finland. The species has only been spotted three times before in Europe.
View Wikipedia Record: Larus schistisagus

EDGE Analysis

Uniqueness Scale: Similiar (0) 
0
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
3
 Unique & Vulnerable (100)
ED Score: 1.03745
EDGE Score: 0.711699

Attributes

Adult Weight [1]  2.92 lbs (1.32 kg)
Breeding Habitat [2]  Coastal cliffs and islands, Coastal marine
Wintering Geography [2]  Pacific Coast
Wintering Habitat [2]  Beaches and estuaries, Coastal marine
Diet [3]  Carnivore (Invertebrates), Carnivore (Vertebrates), Piscivore, Frugivore
Diet - Endothermic [3]  10 %
Diet - Fish [3]  30 %
Diet - Fruit [3]  10 %
Diet - Invertibrates [3]  30 %
Diet - Scavenger [3]  20 %
Forages - Ground [3]  30 %
Forages - Water Surface [3]  40 %
Forages - Underwater [3]  30 %
Clutch Size [4]  3
Clutches / Year [4]  1
Global Population (2017 est.) [2]  340,000
Wing Span [4]  4.6 feet (1.4 m)

Ecoregions

Name Countries Ecozone Biome Species Report Climate Land
Use
Bohai Sea saline meadow China Palearctic Flooded Grasslands and Savannas  
Central Korean deciduous forests Republic of Korea, Dem. People's Rep of Korea Palearctic Temperate Broadleaf and Mixed Forests
Hokkaido deciduous forests Japan Palearctic Temperate Broadleaf and Mixed Forests
Hokkaido montane conifer forests Japan Palearctic Temperate Coniferous Forests
Huang He Plain mixed forests China Palearctic Temperate Broadleaf and Mixed Forests
Jian Nan subtropical evergreen forests China Indo-Malayan Tropical and Subtropical Moist Broadleaf Forests
Manchurian mixed forests Republic of Korea, Dem. People's Rep of Korea, China, Russia Palearctic Temperate Broadleaf and Mixed Forests
Nihonkai evergreen forests Japan Palearctic Temperate Broadleaf and Mixed Forests    
Nihonkai montane deciduous forests Japan Palearctic Temperate Broadleaf and Mixed Forests  
Northeast China Plain deciduous forests China Palearctic Temperate Broadleaf and Mixed Forests
Northern Indochina subtropical forests China, Laos, Myanmar, Thailand, Viet Nam Indo-Malayan Tropical and Subtropical Moist Broadleaf Forests
South China-Vietnam subtropical evergreen forests China, Viet Nam Indo-Malayan Tropical and Subtropical Moist Broadleaf Forests
South Sakhalin-Kurile mixed forests Russia Palearctic Temperate Broadleaf and Mixed Forests    
South Taiwan monsoon rain forests Taiwan Indo-Malayan Tropical and Subtropical Moist Broadleaf Forests
Southern Korea evergreen forests South Korea Palearctic Temperate Broadleaf and Mixed Forests
Taiheiyo evergreen forests Japan Palearctic Temperate Broadleaf and Mixed Forests
Taiheiyo montane deciduous forests Japan Palearctic Temperate Broadleaf and Mixed Forests
Taiwan subtropical evergreen forests Taiwan Indo-Malayan Tropical and Subtropical Moist Broadleaf Forests
Yellow Sea saline meadow China Palearctic Flooded Grasslands and Savannas
Yunnan Plateau subtropical evergreen forests China Palearctic Tropical and Subtropical Moist Broadleaf Forests

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Alaska Maritime National Wildlife Refuge Ib 2347132 Alaska, United States
Aleutian Islands Biosphere Reserve 2720489 Alaska, United States    
Arctic National Wildlife Refuge Ib 12402936 Alaska, United States
Kronotskiy Biosphere Reserve 361480 Russia  
Niagara Escarpment Biosphere Reserve 470167 Ontario, Canada  
Ostrov Vrangelya (Wrangel Island) Zapovednik Nature Monument III 180 Russia    
Sikhote-Alinskiy Biosphere Reserve 978001 Russia  
Yancheng Nature Reserve V 711488 China    

Important Bird Areas

BirdLife Species Factsheet: View Factsheet
Name Location  IBA Criteria   Website   Climate   Land Use 
Daikokujima islet Japan A4i, A4ii, A4iii
Karaginskiy island Russia (Asian) A1, A4i, A4iii  
Kuril islands (between Urup and Paramushir) Russia (Asian) A1, A4i, A4ii, A4iii  
Oria cape Russia (Asian) A4i, A4iii
Shiretoko, Mount Syari-dake Japan A1, A3, A4i
Signalny island Russia (Asian) A4i, A4iii
Starichkov island Russia (Asian) A1, A4i, A4ii, A4iii
Teurito island Japan A4i, A4ii, A4iii    
Tomoshirijima and Chitomoshirijima islets Japan A4i
Tyuleniy island Russia (Asian) A1, A4i, A4ii, A4iii  
Utashud island Russia (Asian) A1, A4i, A4ii, A4iii
Utkholok river Russia (Asian) A4i, A4iii  
Verkhoturova island Russia (Asian) A4i, A4ii, A4iii
Yururito and Moyururito islets Japan A4i, A4ii

Biodiversity Hotspots

Name Location Endemic Species Website
Japan Japan No

Prey / Diet

Empetrum nigrum (black crowberry)[4]
Sardinops sagax (Australian pilchard)[4]

Prey / Diet Overlap

Competing SpeciesCommon Prey Count
Balaenoptera borealis (Sei Whale)1
Bombus polaris (Bumblebee)1
Bonasa umbellus (Ruffed Grouse)1
Branta hutchinsii (Cackling Goose)1
Calcarius lapponicus (Lapland Longspur)1
Calidris tenuirostris (Great Knot)1
Corvus corax (Northern Raven)1
Falcipennis canadensis (Spruce Grouse)1
Falcipennis canadensis franklinii (Franklin’s Grouse)1
Fratercula cirrhata (Tufted Puffin)1
Gadus chalcogrammus (Whiting)1
Gadus macrocephalus (Pacific cod)1
Lagopus lagopus (Willow Ptarmigan)1
Lagopus leucura (White-tailed Ptarmigan)1
Lagopus muta (Rock Ptarmigan)1
Lamna ditropis (Salmon shark)1
Larus crassirostris (Black-tailed Gull)1
Lemmus sibiricus (brown lemming)1
Lepus othus (Alaskan Hare)1
Limosa haemastica (Hudsonian Godwit)1
Lyrurus tetrix (Eurasian Black Grouse)1
Martes americana (American Marten)1
Myodes rufocanus (gray red-backed vole)1
Myodes rutilus (northern red-backed vole)1
Numenius tahitiensis (Bristle-thighed Curlew)1
Ochotona collaris (Collared Pika)1
Ovibos moschatus (muskox)1
Phocoena phocoena (Harbor Porpoise)1
Pluvialis fulva (Pacific Golden-Plover)1
Poecile hudsonicus (Boreal Chickadee)1
Puffinus griseus (Sooty Shearwater)1
Puffinus opisthomelas (Black-vented Shearwater)1
Sula leucogaster (Brown Booby)1
Sula nebouxii (Blue-footed Booby)1
Tetrao urogallus (Western Capercaillie)1
Ursus americanus (black bear)1
Ursus arctos (Grizzly Bear)1

Predators

Haliaeetus pelagicus (Steller's Sea-Eagle)[5]

Consumers

Parasitized by 
Aploparaksis cirrosa[6]
Aporchis rugosus[6]
Choanotaenia porosa <Unverified Name>[6]
Cosmocephalus obvelatus <Unverified Name>[6]
Cryptocotyle lingua[6]
Dicranotaenia clavicirrus[6]
Diplostomum huronense[6]
Diplostomum rutili[6]
Erschoviorchis lintoni[6]
Eucoleus contortus <Unverified Name>[6]
Hymenolepis clavicirrosus <Unverified Name>[6]
Hymenolepis ductilis <Unverified Name>[6]
Microphallus similis[6]
Microsomacanthus ductilis[6]
Pectinospirura lari <Unverified Name>[6]
Pectinospirura multidentata <Unverified Name>[6]
Stictodora sawakinensis[6]
Wardium fryei[6]

Range Map

North America; Oceania;

Photos

Citations

Attributes / relations provided by
1Gibbs, D., E. Barnes, and J. Cox. 2001. Pigeons and Doves: A Guide to the Pigeons and Doves of the World. Yale University Press, New Haven, Connecticut
2Partners in Flight Avian Conservation Assessment Database, version 2017. Accessed on January 2018.
3Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
4del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
5Diet of the Steller’s Sea Eagle in the Northern Sea of Okhotsk, Irina UTEKHINA, Eugene POTAPOV & Michael J. MCGRADY, First Symposium on Steller’s and White-tailed Sea Eagles in East Asia pp. 71-82, 2000
6Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 WWF WildFINDER
Biodiversity Hotspots provided by Critical Ecosystem Partnership Fund
Images provided by Google Image Search
Abstract provided by DBpedia licensed under a Creative Commons License
Weather provided by NOAA METAR Data Access