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The site was identified as important in 2015 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
Long-tailed Duck Clangula hyemalis	VU	passage	1989-2014	12,092-30,000 individuals	B1i, C3
Common Eider Somateria mollissima	NT	passage	1996	30,000 individuals	A4i, B1i, C3
A4iii Species group - waterbirds	n/a	passage	1996	41,000 individuals	A4iii, C4

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2015).

State (condition of the trigger species' populations)
Scientific name	Common name	Reference population	Actual population	Units	% of population remaining	Result
Somateria mollissima	Common Eider	30000	18000	individuals	60	unfavourable

Pressure (threats to the trigger species and/or their habitats)
Threat level 1	Threat level 2	Timing	Scope	Severity	Result
Human intrusions and disturbance	recreational activities	happening now	small area/few individuals (<10%)	no or imperceptible deterioration	low
Pollution	agricultural & forestry effluents - nutrient loads	happening now	some of area/population (10-49%)	slow but significant deterioration	medium
Pollution	domestic & urban waste water - sewage	happening now	small area/few individuals (<10%)	slow but significant deterioration	low
Transportation and service corridors	shipping lanes	happening now	small area/few individuals (<10%)	no or imperceptible deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation	Management planning	Other conservation action	Result
Some of site covered (10-49%)	No management plan exists but the management planning process has begun	Some limited conservation initiatives are in place	low

For more information about IBA conservation status, please click here

Protected area (PA)	PA designation	PA area (ha)	Relationship of PA with IBA	Overlap of PA with IBA (ha)
Uddskatanin luonnonsuojelualue	Valtion luonnonsuojelualue	32	protected area contained by site	29
TULLINIEMEN LUONNONSUOJEL	Yksityinen luonnonsuojelualue	2,245	protected area contained by site	2,338
Tulliniemen linnustonsuojelualue/ Tulliniemi bird protection area	Baltic Sea Protected Area (HELCOM)	2,566	protected area overlaps with site	0
Tulliniemen linnustonsuojelualue	Site of Community Importance (Habitats Directive)	2,566	protected area overlaps with site	0
Tulliniemen linnustonsuojelualue	Special Protection Area (Birds Directive)	2,566	protected area overlaps with site	2,566
Saaristomeri /Archipelago Sea	Baltic Sea Protected Area (HELCOM)	59,842	protected area is adjacent to site	0
Saaristomeri	Site of Community Importance (Habitats Directive)	49,735	protected area overlaps with site	0
Saaristomeri	Special Protection Area (Birds Directive)	59,842	protected area overlaps with site	0
Saaristomeren kansallispuisto	Kansallispuisto	52,582	protected area overlaps with site	0
Hanko western archipelago	Baltic Sea Protected Area (Helcom)	5,265	protected area contained by site	5,295
Bird Wetlands of Hanko and Tammisaari	Ramsar Site, Wetland of International Importance	55,196	protected area overlaps with site	0

Habitat (IUCN level 1)	Habitat detail	Extent (% of site)
Marine Neritic		-
Marine Coastal/Supratidal		-
Unknown		-

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

Land-use	Extent (% of site)
tourism/recreation	-
urban/industrial/transport	-
unknown	-

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Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Hanko western archipelago. Downloaded from http://datazone.birdlife.org/site/factsheet/hanko-western-archipelago-iba-finland on 30/11/2023.