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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 ('triggering') IBA criteria.

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

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Greylag Goose Anser anser	LC	passage (1994)	6,700 birds	A4i, B1i, C3
Common Pochard Aythya ferina	VU	non-breeding (1994)	15,765 birds	A4i, B1i, C3
Tufted Duck Aythya fuligula	LC	winter (1994)	23,045 birds	A4i, B1i, C3
Gadwall Mareca strepera	LC	passage (1996)	328 birds	B1i, C3
Eurasian Bittern Botaurus stellaris	LC	breeding (1995)	35 pairs	B2, C2, C6
Great Cormorant Phalacrocorax carbo	LC	breeding (1995)	2,250 pairs	A4i, B1i, C3
White-tailed Sea-eagle Haliaeetus albicilla	LC	breeding (1997)	1 pairs	C6
A4iii Species group - waterbirds	n/a	winter (1991)	20,000-49,999 birds	A4iii, C4

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2000. The most recent assessment (2010) is shown below.

State (condition of the trigger species' populations)
Species	Actual vs Reference (units)	% remaining	Result
Bean Goose Anser fabalis	700 / 700 (birds)	100	good
Goosander Mergus merganser	260 / 2,165 (birds)	13	very poor
Great Cormorant Phalacrocorax carbo	1,469 / 3,375 (pairs)	44	poor
European Honey-buzzard Pernis apivorus	3 / 7 (pairs)	43	poor
Common Kingfisher Alcedo atthis	1 / 1 (pairs)	100	good

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Not assessed	Not assessed	Not assessed	not assessed

Year	Protected Area	Designation (management category)	% coverage of IBA
-	Maribosøerne	Game Reserve (-)	33
1954	Maribo Søerne	Fredet ved afgørelse, exl. Kirkeomgivelser (III)	32
1957	Maribo Soerne	Major Conservation Area (-)	31
1992	Lolland Kommune	§3 beskyttet natur (alle søer, moser, vandløb, heder, enge mv) (IV)	1
1992	Sorø Kommune	§3 beskyttet natur (alle søer, moser, vandløb, heder, enge mv) (IV)	<1

Habitat	% of IBA	Habitat detail
Wetlands (inland)	45	Standing freshwater; Water fringe vegetation
Artificial/Terrestrial	30
Forest	25	Broadleaved deciduous woodland

Land use	% of IBA
nature conservation and research	100
agriculture	30
forestry	25

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Maribo lakes (Denmark). Downloaded from https://datazone.birdlife.org/site/factsheet/maribo-lakes-iba-denmark on 23/12/2024.