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close| Location | Poland, podlaskie |
| Central coordinates | 23o 40.00' East 53o 4.00' North |
| IBA criteria | C1, C6 |
| Area | 5,168 ha |
| Altitude | 146 - 160m |
| Year of IBA assessment | 2010 |
Ornithological information A total of 105 species have been recorded breeding. Species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (one bird on passage), Crex crex (20-40 breeding birds).
Site description The site consists of a large basin covered by a thick layer of peat. The basin drains into the upper course of the Supraœl river, which traverses the northern part of the site. Most of the area has been drained by man, but in many places there are still mires. The central part of the basin is occupied by fens (mainly sedge-beds, occasionally reedbeds Phragmites), while the southern part is raised bog, with marshy forest and a variety of bog mosses. There are two small lakes, Gorbacz and Wiejki. The marshy forest is dominated by birch Betula and pine Pinus, with alder Alnus scrub also common.
Populations of IBA trigger species
| Species | Season | Period | Population estimate | Quality of estimate | IBA Criteria | IUCN Category |
|---|---|---|---|---|---|---|
| Corncrake Crex crex | breeding | 2009 | 200-270 males only | medium | C1 | Least Concern |
| Great Snipe Gallinago media | breeding | 1989-2002 | 9-17 males only | - | C6 | Near Threatened |
Protected areas
| Protected area | Designation | Area (ha) | Relationship with IBA | Overlap with IBA (ha) | |
|---|---|---|---|---|---|
| Gorbacz | Nature Reserve | 114 | unknown | 114 |
|
| Gorbacz NR (Peatbog Reserve) | Nature Reserve | 114 | protected area contained by site | 114 | |
| Ostoja Knyszynska - PLH200006 | Habitats Directive | 136,084 | protected area overlaps with site | 4,361 | |
| Park Krajobrazowy Puszczy Knyszyñskiej | Landscape Park | 73,094 | unknown | 0 | |
| Puszcza Knyszynska - PLB200003 | Birds Directive | 139,590 | protected area contains site | 5,168 |
Habitats
| IUCN habitat | Habitat detail | Extent (% of site) |
|---|---|---|
| Forest | Alluvial and very wet forest; Broadleaved deciduous woodland; Mixed woodland | 15% |
| Grassland | Humid grasslands; Mesophile grasslands | 50% |
| Wetlands (inland) | Fens, transition mires and springs; Raised bogs; Rivers and streams; Standing freshwater | 30% |
| Artificial landscapes (terrestrial) | Arable land; Highly improved re-seeded landscapes | 5% |
Land use
| Land-use | Extent (% of site) |
|---|---|
| agriculture | 55% |
| forestry | 5% |
| not utilised | 40% |
| hunting | - |
Management considerations Tourism/recreation causes disturbance to birds.
Protection status National Low International None114 ha of IBA covered by Nature Reserve (Gorbacz [Peatbog Reserve], 114 ha).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Gródek-Michalowo basin. Downloaded from http://www.birdlife.org on 26/05/2013
To provide new information to update this factsheet or to correct any errors, please email BirdLife
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