|Central coordinates||28o 32.00' East 41o 5.00' North|
|IBA criteria||A1, A4i, A4iii, B1i, B2|
|Year of IBA assessment||2004|
Site description A freshwater lake situated west of Ýstanbul where the Karasu stream reaches the Marmara Sea. The stream was dammed to create a drinking water reservoir; during dry years less than 25% of the lake area remains flooded. Mudflats, sandbanks and reedbeds (Phragmites) have formed where silt deposition occurs. South of the dam is a brackish lake with reed fringes and islands. The lake is largely surrounded by arable land and, increasingly, industrial and residential development. Motorways cut across both ends of the lake.
Key Biodiversity This site is important for wintering and passage waterbirds. It also supports a range of breeding waterbirds. During autumn the arable land surrounding the lake can hold thousands of migrating Ciconia ciconia, which roost here before crossing the Boðaziçi (site 005). Species of global conservation concern that do not meet IBA criteria: Aythya nyroca (thought to breed).
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Red-breasted Goose Branta ruficollis||winter||1998||75-80 individuals||-||A1, B2||Endangered|
|Common Pochard Aythya ferina||winter||1996||14,036 individuals||-||A4i, B1i||Least Concern|
|Larus cachinnans||winter||1996||1,250-8,775 individuals||-||B1i||Not Recognised|
|Mediterranean Gull Larus melanocephalus||passage||1995||10,000 individuals||-||A4i, B1i||Least Concern|
|Little Gull Hydrocoloeus minutus||passage||1991||1,740 individuals||-||A4i, B1i||Least Concern|
|A4iii Species group - waterbirds||winter||1996||22,681 individuals||-||A4iii|
|2013||not assessed||very unfavourable||not assessed|
|Medium - based upon reliable but incomplete / partially representative data|
|Aythya ferina||Common Pochard||20000||424||-||3||very unfavourable|
|Phalacrocorax carbo||Great Cormorant||1500||43||-||3||very unfavourable|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Wetlands (inland)||Standing freshwater; Water fringe vegetation||100%|
|Land-use||Extent (% of site)|
Protection status National High International None2,850 ha of IBA covered by Drinking Water Reservoir (Büyükçekmece Gölü, 2,850 ha).
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Recommended citation BirdLife International (2015) Important Bird Areas factsheet: Büyükçekmece Lake. Downloaded from http://www.birdlife.org on 06/10/2015
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