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close| Location | Netherlands, Friesland |
| Central coordinates | 5o 55.00' East 53o 2.00' North |
| IBA criteria | A4i, A4iii, B1i, B2, C2, C3, C4, C6 |
| Area | 1,260 ha |
| Altitude | |
| Year of IBA assessment | 2000 |
Ornithological information An important roost for geese Anser from surrounding feeding areas.
Site description An area of former peat-workings comprising open water, reedbeds, shrubs and wet meadows, located to the north of the city of Heerenveen. Human activities include reed-harvesting (`Other' land-use, below). This site, together with site 055, formed part of a single, larger site (former site NL023) in the previous pan-European IBA inventory (Grimmett and Jones 1989).
Populations of IBA trigger species
| Species | Season | Period | Population estimate | Quality of estimate | IBA Criteria | IUCN Category |
|---|---|---|---|---|---|---|
| Greater White-fronted Goose Anser albifrons | winter | 1994 | 35,173 individuals | good | A4i, B1i, C3 | Least Concern |
| Barnacle Goose Branta leucopsis | winter | 1994 | 3,430 individuals | good | A4i, B1i, B2, C2 | Least Concern |
| Black Tern Chlidonias niger | breeding | 1993 | 62 breeding pairs | medium | B2, C2, C6 | Least Concern |
| A4iii Species group - waterbirds | winter | 1994 | - | unknown | A4iii, C4 |
Protected areas
| Protected area | Designation | Area (ha) | Relationship with IBA | Overlap with IBA (ha) | |
|---|---|---|---|---|---|
| De Deelen | Nature Conservation Law | 349 | protected area contained by site | 1,158 |
|
| De Deelen | Wetlands of International Importance (Ramsar) | 520 | protected area contained by site | 520 |
|
| Deelen - NL2000001 | Birds Directive | 514 | protected area contained by site | 514 |
Habitats
| IUCN habitat | Habitat detail | Extent (% of site) |
|---|---|---|
| Forest | Alluvial and very wet forest | 10% |
| Wetlands (inland) | Standing freshwater; Water fringe vegetation | 90% |
Land use
| Land-use | Extent (% of site) |
|---|---|
| agriculture | 5% |
| other | 5% |
| fisheries/aquaculture | 50% |
| water management | 100% |
| nature conservation and research | 92% |
| tourism/recreation | 20% |
| hunting | 20% |
Management considerations Nutrient pollution of wetlands is a problem (`Other' threat, above).
Protection status National High International Partial1,158 ha of IBA covered by Nature Reserve (De Deelen, 1,158 ha). 520 ha of IBA covered by Special Protection Area (De Deelen, 520 ha). 520 ha of IBA covered by Ramsar Site (De Deelen, 520 ha).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: De Deelen. Downloaded from http://www.birdlife.org on 22/05/2013
To provide new information to update this factsheet or to correct any errors, please email BirdLife
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