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The site was identified as internationally important for bird conservation in 2000 because it was regularly supporting significant populations of the species listed below, meeting IBA criteria.

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

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Razorbill Alca torda	LC	breeding (1997)	4,000 breeding pairs	B1ii, B3, C3
Common Murre Uria aalge	LC	breeding (1980–1989)	8,000–9,000 breeding pairs	B1ii, C3
A4iii Species group - seabirds	n/a	breeding (1980–1997)	10,000-19,999 breeding pairs	A4iii, C4

Year	Protected Area	Designation (management category)	% coverage of IBA
1900	Stora Karlsö	Naturreservat (V)	13
1900	Lilla Karlsö	Naturreservat (V)	11
1994	Gotlandskusten	Naturvårdsområde (V)	1

Habitat	% of IBA	Habitat detail
Marine Neritic	95
Marine Coastal/Supratidal	minor (<10)
Shrubland	minor (<10)	Scrub

Land use	% of IBA
agriculture	-
tourism/recreation	-

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Karlsö Islands (Sweden). Downloaded from https://datazone.birdlife.org/site/factsheet/karlsö-islands-iba-sweden on 06/01/2025.