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Year of most recent IBA criteria assessment: 2000

Populations of IBA trigger species

Species	Current IUCN Red List Category	Season	Year(s) of estimate	Population estimate	IBA Criteria Triggered
Whooper Swan Cygnus cygnus	LC	non-breeding	1994	941 individuals	A4i, B1i, C2
Tundra Swan Cygnus columbianus	LC	non-breeding	1993	332 individuals	A4i, B1i, B2, C2
Brent Goose Branta bernicla	LC	non-breeding	1994	6,800 individuals	A4i, B1i, C3
Barnacle Goose Branta leucopsis	LC	non-breeding	1997	30,000 individuals	A4i, B1i, C2, C6
Common Shelduck Tadorna tadorna	LC	non-breeding	1994	6,500 individuals	A4i, B1i, C3
Northern Pintail Anas acuta	LC	non-breeding	1994	900 individuals	B1i, C3
Pied Avocet Recurvirostra avosetta	LC	breeding	1994	248-482 breeding pairs	B1i, B3, C2
Pied Avocet Recurvirostra avosetta	LC	passage	1994	1,300 individuals	A4i, B1i, C2
Eurasian Golden Plover Pluvialis apricaria	LC	passage	1994	25,000 individuals	A4i, B1i, C2
Bar-tailed Godwit Limosa lapponica	NT	passage	1994	4,600 individuals	A4i, B1i, C2
Black-tailed Godwit Limosa limosa	NT	breeding	1994	110-125 breeding pairs	B2
Red Knot Calidris canutus	NT	passage	1994	21,300 individuals	A4i, B1i, C3
Dunlin Calidris alpina	LC	passage	1994	62,000 individuals	A4i, B1i, C3
Spotted Redshank Tringa erythropus	LC	passage	1994	1,270 individuals	A4i, B1i, C3
Black Tern Chlidonias niger	LC	breeding	1994	36-41 breeding pairs	C2, C6
A4iii Species group - waterbirds	n/a	non-breeding	-	20,000-49,999 individuals	A4iii, C4
A4iii Species group - waterbirds	n/a	passage	1994	100,000-499,999 individuals	A4iii, C4

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

Threats to the site (pressure)
Threat Level 1	Threat Level 2	Timing	Scope	Severity	Result
Agricultural expansion and intensification	annual & perennial non-timber crops - shifting agriculture	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Human intrusions and disturbance	recreational activities	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Invasive and other problematic species and genes	invasive non-native/alien species/diseases - named species	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Invasive and other problematic species and genes	problematic native species/diseases - named species	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high
Other	other threat	happening now	majority/most of area/population (50-90%)	moderate to rapid deterioration	high

Condition of key/trigger populations (state)
Scientific	Common	TargetPop	ActualPop	Units	Remaining	Result
Anser anser	Greylag Goose	6700	6000	individuals	90	near favourable
Pluvialis squatarola	Grey Plover	3600	2100	individuals	59	unfavourable
Charadrius alexandrinus		23	5	individuals	22	very unfavourable
Limosa limosa	Black-tailed Godwit	242	101	breeding pairs	42	unfavourable
Calidris pugnax	Ruff	87	0	breeding pairs	0	very unfavourable
Calidris alpina	Dunlin	9	0	breeding pairs	0	very unfavourable
Sternula albifrons	Little Tern	12	1	breeding pairs	9	very unfavourable
Sterna paradisaea	Arctic Tern	133	13	breeding pairs	10	very unfavourable
Asio flammeus	Short-eared Owl	2	0	individuals	0	very unfavourable
Cyanecula svecica	Bluethroat	50	50	breeding pairs	100	favourable

Conservation actions taken at site (response)
Conservation Designation	Management Planning	Conservation Action	Result
Most of site (50-90%) covered (including the most critical parts for important bird species)	No management plan exists but the management planning process has begun	Some limited conservation initiatives are in place	low

For more information about IBA monitoring please click here

Protection status:

Protected Area	Designation	Area (ha)	Relationship with IBA	Overlap with IBA (ha)
Vidåen, Tøndermarsken og Saltvandssøen	Special Protection Area (Birds Directive)	35,050	protected area contained by site	6,498
Vidå med tilløb, Rudbøl Sø og Magisterkogen	Site of Community Importance (Habitats Directive)	603	protected area overlaps with site	351
Vadehavet med Ribe Å, Tved Å og Varde Å vest for Varde	Site of Community Importance (Habitats Directive)	134,760	protected area overlaps with site	814
Vadehavet (Wadden Sea)	Ramsar Site, Wetland of International Importance	150,482	protected area contains site	6,520
Tøndermarsken Statsfredning	Protected by conservation order, excl. Church surroundings	2,490	protected area contained by site	2,490
Nationalpark Vadehavet	National Park	146,600	protected area overlaps with site	0
Margrethe Kog	Protected by conservation order, excl. Church surroundings	1,320	protected area contained by site	1,245
Kiers Gård Margrethe Kog	Protected by conservation order, excl. Church surroundings	2	protected area contained by site	2

IUCN Habitat	Habitat detail	Extent (% of site)
Coastline	Salt marshes, Lagoons	-
Artificial - terrestrial		-

For further information about the habitat classification please click here.

Land-use	Extent (% of site)
nature conservation and research	-
agriculture	-

For further information about the land use classification please click here.

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Recommended citation
BirdLife International (2019) Important Bird Areas factsheet: Tøndermarsken, Magisterkog and Rudbøl Sø. Downloaded from http://www.birdlife.org on 23/09/2019.