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The site was identified as important 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 List1	Season	Year(s)	Size	IBA criteria
Whooper Swan Cygnus cygnus	LC	winter	1994	471 individuals	B1i, B3, C2
Tundra Swan Cygnus columbianus	LC	winter	1995	479 individuals	A4i, B1i, B2, C2, C6
Greylag Goose Anser anser	LC	passage	1994	22,000 individuals	A4i, B1i, C3
Pink-footed Goose Anser brachyrhynchus	LC	passage	1994	30,000 individuals	A4i, B1i, C3
Northern Pintail Anas acuta	LC	non-breeding	1994	3,000 individuals	B1i, C3
A4iii Species group - waterbirds	n/a	passage	1994	50,000-99,999 individuals	A4iii, C4

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2000) may differ.

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	Reference	Actual	Units	% remaining	Result
Eurasian Golden Plover Pluvialis apricaria	20,000	20,000	individuals	100	favourable
Eurasian Dotterel Eudromias morinellus	74	69	individuals	94	favourable

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Not assessed	Not assessed	Not assessed	not assessed

Year	Protected Area	Designation	% overlap with IBA
1977	Filso	Ramsar Site, Wetland of International Importance	100
1983	Fiilsø	Special Protection Area (Birds Directive)	97
1987	Vrøgum Kær	Fredet ved afgørelse, exl. Kirkeomgivelser	1
1992	Varde Kommune	§3 beskyttet natur (alle søer, moser, vandløb, heder, enge mv)	3
1998	Kallesmærsk Hede; Grærup Langsø, Fiilsø og Kærgård Klitplantage	Site of Community Importance (Habitats Directive)	100

Habitat1	Habitat detail	% of IBA
Marine Coastal/Supratidal		80
Shrubland	Heathland	20

1. IUCN Habitat classification.

Land use	% of IBA
unknown	55
agriculture	40
forestry	5

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Fiilsø (Denmark). Downloaded from https://datazone.birdlife.org/site/factsheet/fiilsø-iba-denmark on 23/11/2024.