Obra river flood-plain (927)
Poland, Europe
Site overview
KBA status: confirmed
Year of last assessment: 2010
National site name: Wielki Leg Obrzanski
Central coordinates: Latitude: 52.0833, Longitude: 16.3667
System: terrestrial
Elevation (m): 61 to 77
Area of KBA (km2): 234.45267
Protected area coverage (%): 38.77
KBA classification: Regional
Legacy site: Yes
Site details
Site description: The widest part of the valley of the middle Obra river is characterized by forests and meadows, without larger settlements or a developed road system. The valley is divided up by channels and ditches which drain to the west (two main channels) or to the east to the Warta river via the Mosiñski channel. The principal valley habitats are wet fields, marshes, and swamp forests of Alnus. Fields are intensively cultivated; wet grassland and scrub are not common. Forest of pine Pinus and oak Quercus covers the higher elevations.
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: Other notable breeding species include Grus grus (20 pairs) and Milvus migrans (six pairs). Breeding species of global conservation concern that do not meet IBA criteria: Crex crex (5-6 pairs).
Habitats
Land use: agriculture (60%) | forestry (30%) | hunting | urban/industrial/transport (10%)
| IUCN Habitat | Coverage % | Habitat detail |
|---|---|---|
| Artificial - Terrestrial | 24 | |
| Forest | 21 | |
| Wetlands(Inland) | 1 | |
| Grassland | 54 |
Threats
Summary of threats to biodiversity at KBA: The main threats are further drainage and intensification of forest management. The site is adjacent to the Przemêcki Landscape Park (21,400 ha).
| Threat level 1 | Threat level 2 | Threat level 3 | Timing |
|---|---|---|---|
| Agriculture & aquaculture | Annual & perennial non-timber crops | Small-holder farming | Ongoing |
| Natural system modifications | Dams & water management/use | Dams (size unknown) | Ongoing |
| Biological resource use | Hunting & collecting terrestrial animals | Intentional use (species being assessed is the target) | Ongoing |
| Biological resource use | Hunting & collecting terrestrial animals | Persecution/control | Ongoing |
| Biological resource use | Logging & wood harvesting | Unintentional effects: large scale (species being assessed is not the target) [harvest] | Ongoing |
| Invasive & other problematic species, genes & diseases | Invasive non-native/alien species/diseases | Unspecified species | Ongoing |
| Natural system modifications | Other ecosystem modifications | Only in the past and unlikely to return | |
| Energy production & mining | Oil & gas drilling | Ongoing | |
| Energy production & mining | Mining & quarrying | Ongoing | |
| Transportation & service corridors | Roads & railroads | Only in the past and unlikely to return | |
| Climate change & severe weather | Droughts | Ongoing | |
| Climate change & severe weather | Temperature extremes | Ongoing |