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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'):

Species	Current IUCN Red List Category	Season	Year(s)	Population estimate at site	IBA criteria met
Tundra Swan Cygnus columbianus	LC	breeding	1997	200 breeding pairs	A3
Brent Goose Branta bernicla	LC	breeding	1997	present	A3, A4i
Greater White-fronted Goose Anser albifrons	LC	breeding	1997	present	A3
Lesser White-fronted Goose Anser erythropus	VU	breeding	1997	present	A1, A3
Long-tailed Duck Clangula hyemalis	VU	breeding	1997	abundant	A3, A4i
Spectacled Eider Somateria fischeri	NT	breeding	1997	2,000 breeding pairs	A3, A4i
King Eider Somateria spectabilis	LC	breeding	1997	common	A3
Common Eider Somateria mollissima	NT	breeding	1997	frequent	A3
Greater Scaup Aythya marila	LC	breeding	1997	uncommon	A3
Baikal Teal Sibirionetta formosa	LC	breeding	1997	rare	A1
Sandhill Crane Grus canadensis	LC	breeding	1997	frequent	A3
Yellow-billed Loon Gavia adamsii	NT	breeding	1997	rare	A3
Grey Plover Pluvialis squatarola	LC	breeding	1997	uncommon	A3
Ruddy Turnstone Arenaria interpres	LC	breeding	1997	uncommon	A3
Dunlin Calidris alpina	LC	breeding	1997	common	A3
A4iii Species group - waterbirds	n/a	breeding	1997	min 20,000 individuals	A4iii

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2004).

Protected area (PA)	PA designation	PA area (ha)	Relationship of PA with IBA	Overlap of PA with IBA (ha)
Chaunskaya guba	Zakaznik	210,500	protected area overlaps with site	12,500

Habitat (IUCN level 1)	Habitat detail	Extent (% of site)
Grassland	Tundra	-
Wetlands (inland)		-

For more information about the IUCN Habitat classification, please click here.

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Chaun delta. Downloaded from http://datazone.birdlife.org/site/factsheet/chaun-delta-iba-russia-(asian) on 03/12/2023.