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Location Denmark, Ribe Amtskommune
Central coordinates 8o 34.00' East  55o 17.00' North
IBA criteria A4i, A4iii, B1i, B2, C2, C3, C4
Area 850 ha
Altitude 0 - 10m
Year of IBA assessment 2000

Dansk Ornitologisk Forening

Site description An island in the Wadden Sea with grassland and meadows enclosed by dykes, saltmarshes and mudflats.

Key Biodiversity This is a very important site for waterbirds, with more than 100,000 individuals using the site. Several species listed on Annex I of the EC Birds Directive breed within the area, including Circus aeruginosus, Recurvirostra avosetta, Philomachus pugnax, Gelochelidon nilotica, Sterna hirundo and S. paradisaea.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Brent Goose Branta bernicla non-breeding  1991  12,000 individuals  good  A4i, B1i, C3  Least Concern 
Haematopus ostralegus non-breeding  1991  15,000 individuals  good  A4i, B1i, C3  Not Recognised 
Common Redshank Tringa totanus breeding  1991  136 breeding pairs  good  B2  Least Concern 
Bar-tailed Godwit Limosa lapponica passage  1991  25,000 individuals  good  A4i, B1i, C2  Near Threatened 
Red Knot Calidris canutus non-breeding  1991  20,000 individuals  good  A4i, B1i, C3  Near Threatened 
Dunlin Calidris alpina passage  1991  75,000 individuals  good  A4i, B1i, C3  Least Concern 
A4iii Species group - waterbirds winter  1991  100,000-499,999 individuals  unknown  A4iii, C4   

IBA Monitoring

2010 not assessed very unfavourable not assessed
Good - based on reliable and complete / representative data

Anas acuta Northern Pintail 200 10 individuals 5 very unfavourable
Branta leucopsis Barnacle Goose 20000 20000 individuals 100 favourable
Tadorna tadorna Common Shelduck 5771 5771 individuals 100 favourable
Spatula clypeata Northern Shoveler 30 15 individuals 50 unfavourable
Anas crecca Common Teal 102 102 individuals 100 favourable
Somateria mollissima Common Eider 3200 3200 individuals 100 favourable
Melanitta nigra 600 600 individuals 100 favourable
Phalacrocorax carbo Great Cormorant 75 75 individuals 100 favourable
Recurvirostra avosetta Pied Avocet 560 560 individuals 100 favourable
Pluvialis apricaria Eurasian Golden Plover 10600 10600 individuals 100 favourable
Pluvialis squatarola Grey Plover 2000 2000 individuals 100 favourable
Numenius arquata Eurasian Curlew 3488 3488 individuals 100 favourable
Tringa nebularia Common Greenshank 1000 1000 individuals 100 favourable
Calidris alpina Dunlin 2 0 breeding pairs 0 very unfavourable
Larus argentatus 1075 952 individuals 89 near favourable
Larus canus Mew Gull 825 825 individuals 100 favourable
Larus marinus Great Black-backed Gull 152 75 individuals 50 unfavourable
Larus ridibundus Black-headed Gull 900 300 individuals 34 very unfavourable
Asio flammeus Short-eared Owl 3 2 breeding pairs 67 unfavourable

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Vadehavet (Wadden Sea) Wetlands of International Importance (Ramsar) 150,482 protected area contains site 850  


IUCN habitat Habitat detail Extent (% of site)
Grassland Humid grasslands  45%
Coastline Mud flats & sand flats; Salt marshes  35%
Artificial - terrestrial Arable land; Other urban and industrial areas  20%

Land use

Land-use Extent (% of site)
nature conservation and research 35%
urban/industrial/transport 10%
agriculture 55%

Protection status National Partial International High850 ha of IBA covered by Special Protection Area (Mandø, 850 ha). 850 ha of IBA covered by Ramsar Site (Vadehavet (Wadden Sea), 140,830 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Mandø. Downloaded from on 22/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife