Terkos Basin This is an IBA in Danger! 

IBA Justification

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 at site 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: The current IUCN Red List category may differ from the category that was valid at the time of IBA criteria assessment.

For more information about the IBA criteria, please click here

IBA Conservation

IBA conservation status - summary
Year of assessment (most recent) Threat (pressure) Condition (state) Action (response)
2016 very high unfavourable medium
Was the whole site assessed? yes Condition (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 the site (state), by habitat
Habitat Habitat detail Reference area (ha) Actual area (ha) Habitat quantity (% remaining) Habitat quality (carrying capacity) Result
Wetlands (inland) 0 0 moderate (70-90%) moderate (70-90%) unfavourable

Conservation actions taken at the site (response)
Protected-area designation Management planning Other 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site (50-90%) covered (including the most critical parts for important bird species) A management plan exists but it is out of date or not comprehensive Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity medium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 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)
Terkos Lake Wetland of Local 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 IUCN habitat classification, please click here.

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Terkos Basin. Downloaded from on 06/06/2023.