Marshy valley of the Drweca river (976)
Poland, Europe
Site overview
KBA status: confirmed
Year of last assessment: 2010
National site name: Bagienna Dolina Drwecy
Central coordinates: Latitude: 53.2833, Longitude: 19.5667
System: freshwater, terrestrial
Elevation (m): 71 to 132
Area of KBA (km2): 33.70673
Protected area coverage (%): 99.89
KBA classification: Regional
Legacy site: Yes
Site details
Site description: The site lies in the Drwêca river valley between Brodnica town and the road between Jajkowo and G³êboczek villages, and includes the lower parts of the Brynica and Samionka river valleys, Sopieñ lake and Ostrów lake. The valley is 600 m to 3 km in width and includes a canal system and oxbow lakes. The Drwêca river has a natural character and meanders strongly; overflow in early spring causes extensive flooding. The vegetation is species-rich; besides meadows there are reedbeds Phragmites, sedge-beds and small stands of alder Alnus woodland.
Rationale for qualifying as KBA: This site qualifies as a Key Biodiversity Area of international significance that was identified using previously established criteria and thresholds for the identification of Important Bird and Biodiversity Areas (IBAs) and for which available data indicate that it does not meet global KBA criteria and thresholds set out in the Global Standard.
Additional biodiversity: Over 200 species have been recorded, 140 of them breeding. Species of global conservation concern that do not meet IBA criteria: Aythya nyroca (up to two birds on passage), Haliaeetus albicilla (up to five non-breeding birds), Crex crex (4-9 breeding pairs).
Habitats
Land use: agriculture (30%) | forestry (40%) | hunting | not utilised (30%)
| IUCN Habitat | Coverage % | Habitat detail |
|---|---|---|
| Grassland | 41 | |
| Wetlands(Inland) | 4 | |
| Forest | 44 | |
| Artificial - Terrestrial | 11 |
Threats
Summary of threats to biodiversity at KBA: Threats to birds include the abandonment of land management, disturbance, and hunting and poaching.
| Threat level 1 | Threat level 2 | Threat level 3 | Timing |
|---|---|---|---|
| Agriculture & aquaculture | Annual & perennial non-timber crops | Small-holder farming | Ongoing |
| Biological resource use | Logging & wood harvesting | Unintentional effects: large scale (species being assessed is not the target) [harvest] | Only in the future |
| Biological resource use | Hunting & collecting terrestrial animals | Intentional use (species being assessed is the target) | Ongoing |
| Pollution | Excess energy | Noise pollution | Ongoing |
| Natural system modifications | Other ecosystem modifications | Only in the future | |
| Residential & commercial development | Tourism & recreation areas | Only in the future | |
| Energy production & mining | Renewable energy | Ongoing | |
| Human intrusions & disturbance | Recreational activities | Ongoing |