Terkos Basin This is an IBA in danger! 

IBA Criteria

Year of most recent IBA criteria assessment: 2004

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Red-breasted Goose Branta ruficollis VU winter 1995 90 individuals A1, B2
Ferruginous Duck Aythya nyroca NT breeding 2000 20 breeding pairs A1
Black Stork Ciconia nigra LC breeding - 5-10 breeding pairs B2
Pygmy Cormorant Microcarbo pygmaeus LC passage 2000 32 individuals A1
Pygmy Cormorant Microcarbo pygmaeus LC winter 2002 224 individuals A1
Whiskered Tern Chlidonias hybrida LC breeding 2000 45 breeding pairs B2

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2016 very high unfavourable medium
Was the whole site covered? Yes State assessed by Habitat
Accuracy of information good

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Natural system modifications dams & water management/use - abstraction of ground water (domestic use) likely in short term (within 4 years) whole area/population (>90%) very rapid to severe deterioration very high
Transportation and service corridors flight paths happening now some of area/population (10-49%) moderate to rapid deterioration high

Condition of habitat (state)
Habitat Habitat Detail Reference Area (ha) Actual Area (ha) % of habitat remaining % of carrying capacity (overall) Result
Wetlands (inland) 0 0 moderate (70-90%) moderate (70-90%) unfavourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Most of site (50-90%) covered (including the most critical parts for important bird species) A management plan exists but it is out of date or not comprehensive Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity medium
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Terkos Lake Ramsar Site, Wetland of International Importance 0 is identical to site 0
Kırklareli Kasatura Basin Nature Protect Area 0 is identical to site 0
Istanbul Catalca Cilingoz YHGS Wildlife Development Area 35,829 is identical to site 0


IUCN Habitat Habitat detail Extent (% of site)
Wetlands (inland) -
For further information about the habitat classification please click here.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Terkos Basin. Downloaded from on 18/08/2022.