Oswin site

IBA Justification

The site was identified as important in 2010 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):
Species Current IUCN Red List Category Season Year(s) Population estimate at site IBA criteria met
Little Crake Zapornia parva LC breeding 2007-2009 70-90 males C6
Black Tern Chlidonias niger LC breeding 2007-2009 40-45 breeding pairs C6

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2010).

IBA Conservation

IBA conservation assessment
Year of assessment (most recent) State (condition) Pressure (threat) Response (action)
2011 favourable not assessed not assessed
Was the whole site assessed? State assessed by Accuracy of information
yes population good

State (condition of the trigger species' populations)
Scientific name Common name Reference population Actual population Units % of population remaining Result
Porzana porzana Spotted Crake 70 100 males 100 favourable
Chlidonias niger Black Tern 45 70 breeding pairs 100 favourable

Response (conservation actions taken for the trigger species and/or their habitats)
Protected-area designation Management planning Other conservation action Result
Not assessed Not assessed Not assessed not assessed
For more information about IBA conservation status, please click here

IBA Protection

Protected area (PA) PA designation PA area (ha) Relationship of PA with IBA Overlap of PA with IBA (ha)
Ostoja Warmińska Special Protection Area (Birds Directive) 145,342 protected area is adjacent to site 0
Ostoja nad Oświnem Site of Community Importance (Habitats Directive) 3,357 protected area overlaps with site 1,659
Lake of Seven Islands Nature Reserve (Rezerwat pyzyrody “Jezioro Siedmiu Wysp”) Ramsar Site, Wetland of International Importance 1,618 protected area overlaps with site 1,007
Jezioro Siedmiu Wysp Rezerwat Przyrody 1,763 protected area overlaps with site 1,000
Jezioro Oświn i okolice Special Protection Area (Birds Directive) 2,516 protected area contains site 2,308
Jeziora Oświn Obszar Chronionego Krajobrazu 15,262 protected area overlaps with site 0


Habitat (IUCN level 1) Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland, Native coniferous woodland, Mixed woodland -
Grassland Humid grasslands, Mesophile grasslands -
Wetlands (inland) Standing freshwater, Rivers and streams, Raised bogs, Water fringe vegetation, Fens, transition mires and springs -
Artificial/Terrestrial Arable land, Ruderal land -
For more information about the IUCN Habitat classification, please click here.

Land use

Land-use Extent (% of site)
agriculture -
forestry -
nature conservation and research -
not utilised -
hunting -

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Oswin site. Downloaded from on 26/09/2023.