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The site was identified as important in 2004 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
Black-billed Capercaillie Tetrao urogalloides	LC	resident	1999	present	A3
Whooper Swan Cygnus cygnus	LC	breeding	1976-1982	1,599-2,650 individuals	A3
Tundra Swan Cygnus columbianus	LC	passage	1999	present	A4i
Brent Goose Branta bernicla	LC	passage	1975	661 individuals	A4i
Bean Goose Anser fabalis	LC	passage	1976-1982	1,500-9,800 individuals	A4i
Greater White-fronted Goose Anser albifrons	LC	passage	1975-1982	2,200-6,100 individuals	A4i
Lesser White-fronted Goose Anser erythropus	VU	passage	1999	uncommon	A1, A4i
Siberian Scoter Melanitta stejnegeri	LC	passage	1976	5,500 individuals	A4i
Common Goldeneye Bucephala clangula	LC	breeding	1976-1982	100-140 individuals	A3, A4i
Smew Mergellus albellus	LC	breeding	1976-1982	150-350 individuals	A3, A4i
Red-breasted Merganser Mergus serrator	LC	breeding	1999	present	A4i
Tufted Duck Aythya fuligula	LC	breeding	1976-1982	common	A4i
Northern Shoveler Spatula clypeata	LC	breeding	1976-1982	700-1,700 individuals	A4i
Baikal Teal Sibirionetta formosa	LC	breeding	1976-1982	110-960 individuals	A1, A4i
Falcated Duck Mareca falcata	LC	breeding	1975-1982	150-250 individuals	A3, A4i
Eurasian Wigeon Mareca penelope	LC	breeding	1976-1982	2,900-6,600 individuals	A3, A4i
Northern Pintail Anas acuta	LC	breeding	1976-1982	5,500-11,000 individuals	A4i
Common Teal Anas crecca	LC	breeding	2004	present	A4i
Common Crane Grus grus	LC	breeding	1999	present	A3, A4i
Red-throated Loon Gavia stellata	LC	breeding	1999	present	A4i
Arctic Loon Gavia arctica	LC	breeding	1999	present	A4i
Far Eastern Curlew Numenius madagascariensis	EN	breeding	1982	300 breeding pairs	A3
Pin-tailed Snipe Gallinago stenura	LC	breeding	1999	present	A3
Terek Sandpiper Xenus cinereus	LC	breeding	1999	present	A3
Common Sandpiper Actitis hypoleucos	LC	breeding	1999	present	A4i
Green Sandpiper Tringa ochropus	LC	breeding	1999	present	A3, A4i
Common Greenshank Tringa nebularia	LC	breeding	1999	present	A3, A4i
Wood Sandpiper Tringa glareola	LC	breeding	1999	present	A4i
Northern Hawk-owl Surnia ulula	LC	resident	1999	present	A3
Great Grey Owl Strix nebulosa	LC	resident	1999	present	A3
Siberian Jay Perisoreus infaustus	LC	resident	1999	present	A3
Siberian Tit Poecile cinctus	LC	resident	1999	present	A3
Lanceolated Warbler Locustella lanceolata	LC	breeding	1999	present	A3
Arctic Warbler Phylloscopus borealis	LC	breeding	1999	present	A3
Siberian Thrush Geokichla sibirica	LC	breeding	1999	present	A3
Eyebrowed Thrush Turdus obscurus	LC	breeding	1999	present	A3
Turdus naumanni	NR	breeding	1999	present	A3
Bohemian Waxwing Bombycilla garrulus	LC	breeding	1999	present	A3
Siberian Accentor Prunella montanella	LC	breeding	1999	present	A3
Brambling Fringilla montifringilla	LC	breeding	1999	present	A3
Pallas's Rosefinch Carpodacus roseus	LC	breeding	1999	present	A3
Pine Grosbeak Pinicola enucleator	LC	breeding	1999	present	A3
Two-barred Crossbill Loxia leucoptera	LC	resident	1999	present	A3
Pallas's Bunting Emberiza pallasi	LC	breeding	1999	present	A3
Yellow-breasted Bunting Emberiza aureola	CR	breeding	1999	present	A3
Rustic Bunting Emberiza rustica	VU	breeding	1999	present	A3
Little Bunting Emberiza pusilla	LC	breeding	1999	present	A3
Yellow-browed Bunting Emberiza chrysophrys	LC	breeding	1999	present	A3
A4iii Species group - waterbirds	n/a	breeding	1975-1982	11,000-22,000 individuals	A4iii

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2004) may differ.

Year	Protected Area	Designation	% overlap with IBA
1986	Ust'-Viljujskiy	Zakaznik	75

Habitat1	Habitat detail	% of IBA
Forest	Coniferous forest (temperate/boreal)	-
Grassland	Edaphic grassland	-
Shrubland		-
Wetlands (inland)		-

1. IUCN Habitat classification.

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Forty Islands (Russia (Asian)). Downloaded from https://datazone.birdlife.org/site/factsheet/forty-islands-iba-russia-(asian) on 22/11/2024.