Arresø (Denmark) | Details | BirdLife International

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Arresø

Current view: Data table and detailed info

IBA Justification

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
Goosander Mergus merganser	LC	winter (1993)	5,000 birds	A4i, B1i, C3

IBA Conservation

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.

IBA conservation assessment
Year of assessment	State	Pressure	Response
2010	very poor	not assessed	not assessed
Whole site assessed?	State assessed by	Accuracy of information
yes	population	good

State (condition of the trigger species' populations)
Species	Actual vs Reference (units)	% remaining	Result
Smew Mergellus albellus	240 / 240 (birds)	100	good
Goosander Mergus merganser	5,950 / 5,950 (birds)	100	good
Spotted Crake Porzana porzana	0 / 2 (birds)	0	very poor
Osprey Pandion haliaetus	7 / 10 (birds)	70	moderate
White-tailed Sea-eagle Haliaeetus albicilla	7 / 7 (birds)	100	good
Common Kingfisher Alcedo atthis	2 / 2 (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

IBA Protection

Year	Protected Area	Designation (management category)	% coverage of IBA
1949	Tibirke Bakker, Ellemose	Fredet ved afgørelse, exl. Kirkeomgivelser (V)	1
1992	Gribskov Kommune	§3 beskyttet natur (alle søer, moser, vandløb, heder, enge mv) (IV)	31
1992	Halsnæs Kommune	§3 beskyttet natur (alle søer, moser, vandløb, heder, enge mv) (IV)	28
1992	Hillerød Kommune	§3 beskyttet natur (alle søer, moser, vandløb, heder, enge mv) (IV)	4

Habitats

Habitat	% of IBA	Habitat detail
Marine Coastal/Supratidal	90
Forest	5
Grassland	5	Humid grasslands

Land use

Land use	% of IBA
unknown	90
agriculture	5
forestry	5

Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Arresø (Denmark). Downloaded from https://datazone.birdlife.org/site/factsheet/arresø-iba-denmark on 05/12/2024.