Data Zone
Country/territory: Poland
IBA criteria met: C4, C7 (2010)
For more information about IBA criteria, please click here
Area: 3,136 hectares (31.36 km2)
| IBA conservation status | |||
|---|---|---|---|
| Year of assessment (most recent) | State (condition) | Pressure (threat) | Response (action) |
| 2011 | poor | not assessed | not assessed |
| For more information about IBA monitoring, please click here | |||
Site description (2000 baseline)
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.
Key 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).
Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Marshy valley of the Drweca river (Poland). Downloaded from
https://datazone.birdlife.org/site/factsheet/marshy-valley-of-the-drweca-river-iba-poland on 26/12/2024.