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close| Location | Netherlands, Friesland |
| Central coordinates | 5o 52.00' East 53o 13.00' North |
| IBA criteria | A4i, A4iii, B1i, B2, C2, C3, C4, C6 |
| Area | 600 ha |
| Altitude | 0 - 1m |
| Year of IBA assessment | 2000 |
Ornithological information An important roost for geese Anser which come from surrounding feeding areas.
Site description A complex of freshwater lakes (resulting partly from peat diggings), reedbeds and wet meadows, located to the east of the city of Leeuwarden. Human activities include reed-harvesting (`Other' land-use, below), and the site includes two duck decoys.
Populations of IBA trigger species
| Species | Season | Period | Population estimate | Quality of estimate | IBA Criteria | IUCN Category |
|---|---|---|---|---|---|---|
| Greater White-fronted Goose Anser albifrons | winter | 1989 | 40,000 individuals | good | A4i, B1i, C3 | Least Concern |
| Barnacle Goose Branta leucopsis | winter | 1990 | 4,000 individuals | good | A4i, B1i, B2, C2 | Least Concern |
| Eurasian Wigeon Anas penelope | winter | 1990 | 20,000 individuals | good | A4i, B1i, C3 | Least Concern |
| Northern Shoveler Anas clypeata | non-breeding | 1989 | 1,000 individuals | good | B1i, C3 | Least Concern |
| Ruff Philomachus pugnax | non-breeding | 1989 | 4,000 individuals | good | C6 | Least Concern |
| A4iii Species group - waterbirds | winter | 1990 | - | unknown | A4iii, C4 |
Protected areas
| Protected area | Designation | Area (ha) | Relationship with IBA | Overlap with IBA (ha) | |
|---|---|---|---|---|---|
| Groote Wielen - NL2003020 | Birds Directive | 608 | protected area contains site | 600 | |
| Ryptsjerkster- en Binnemiedepolder | Nature Reserve | 462 | protected area contained by site | 462 |
Habitats
| IUCN habitat | Habitat detail | Extent (% of site) |
|---|---|---|
| Wetlands (inland) | Standing freshwater; Water fringe vegetation | 40% |
| Artificial landscapes (terrestrial) | Highly improved re-seeded landscapes | 60% |
Land use
| Land-use | Extent (% of site) |
|---|---|
| agriculture | 6% |
| other | 5% |
| fisheries/aquaculture | 10% |
| water management | 100% |
| hunting | 5% |
| nature conservation and research | 85% |
| tourism/recreation | 50% |
Management considerations A compensation scheme is in place for those farmers affected by restrictions on agricultural practices.
Protection status National Partial International None462 ha of IBA covered by Nature Reserve (Ryptsjerkster- en Binnemiedepolder, 462 ha).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Groote Wielen. Downloaded from http://www.birdlife.org on 24/05/2013
To provide new information to update this factsheet or to correct any errors, please email BirdLife
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