Warta River Mouth

Country/territory: Poland

IBA criteria met: C1, C2, C3, C4, C6 (2010)
For more information about IBA criteria, please click here

Area: 32,800 ha

Ogólnopolskie Towarzystwo Ochrony Ptaków
IBA conservation status
Year of assessment (most recent) State (condition) Pressure (threat) Response (action)
2013 not assessed very high medium
For more information about IBA monitoring, please click here

Site description (2000 baseline)
The site includes the flood-plain of the Warta river, where it meets the Odra river, and the lower course of the Postomia river. There are unregulated stretches of river, oxbow lakes, old drainage channels, small lakes, periodically flooded meadows, and pastures. The area floods almost every year, with annual fluctuations in water-level of up to 3.5 m. Highest levels are in March and April. In some years the whole area is underwater all year, in others for only a few months or not at all. Accordingly, the vegetation varies in different years. During heavy floods water-fringe vegetation predominates, mainly reed Phragmites and especially reed-grass Glyceria and canary-grass Phalaris, occupying a few hundred hectares. Large areas that have recently emerged from water are occupied by ruderal herbs Polygonum/Bidens. When the flood is limited or does not occur, such vegetation dies and is replaced by dry-ground vegetation and willow Salix bushes.

Key biodiversity
A very important area for moulting, staging, wintering and roosting waterbirds, mainly wildfowl. Up to 33,000 duck (Anatidae) stage here during spring migration, with up to 78,000 in autumn. Over 240 species have been recorded, including 160 breeding species. Data in table are for 1991-1996 unless otherwise stated

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Warta River Mouth. Downloaded from on 02/12/2023.