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The site was identified as internationally important for bird conservation in 2015 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 List	Season (year/s of estimate)	Size	IBA criteria
Long-tailed Duck Clangula hyemalis	VU	passage (2007–2014)	8,150–32,000 birds	B1i
Common Eider Somateria mollissima	NT	passage (2000–2014)	5,809–18,000 birds	B1i
Mew Gull Larus canus	LC	breeding (1994)	800–1,000 pairs	B2
Great Black-backed Gull Larus marinus	LC	breeding (1994)	130–160 pairs	B3
Caspian Tern Hydroprogne caspia	LC	breeding (1994)	115 pairs	A4i, B1i, B2, C2, C6
Black Guillemot Cepphus grylle	LC	breeding (1994)	120 pairs	B2
White-tailed Sea-eagle Haliaeetus albicilla	LC	winter (1994)	20–30 birds	A1, C1

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2015. The most recent assessment (2010) is shown below.

State (condition of the trigger species' populations)
Species	Actual vs Reference (units)	% remaining	Result
Great Black-backed Gull Larus marinus	70 / 130 (pairs)	54	not assessed
Caspian Tern Hydroprogne caspia	170 / 170 (pairs)	100	good
Black Guillemot Cepphus grylle	65 / 120 (pairs)	55	poor

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Invasive and other problematic species and genes	happe­ning now	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium
Human intrusions and disturbance	happe­ning now	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Most of area (50–90%) covered (including the most critical parts for important bird species)	A management plan exists, but it is out of date or not compre­hensive	Substantive conservation measures are being implemented, but these are not compre­hensive and are limited by resources and capacity	medium

Year	Protected Area	Designation (management category)	% coverage of IBA
-	Tammisaari and Inkoo western archipelago	Baltic Sea Protected Area (Helcom) (UA)	73
1926	NOTHAMNIN LUONNONSUOJELUA	Yksityinen luonnonsuojelualue (IV)	5
1989	Tammisaaren saariston kansallispuisto	Kansallispuisto (II)	19

Habitat	% of IBA	Habitat detail
Marine Neritic	80
Marine Coastal/Supratidal	minor (<10)
Marine Intertidal	minor (<10)

Land use	% of IBA
hunting	-
military	-
tourism/recreation	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Tammisaari and Inkoo western archipelago (Finland). Downloaded from https://datazone.birdlife.org/site/factsheet/tammisaari-and-inkoo-western-archipelago-iba-finland on 22/12/2024.