|Central coordinates||47o 34.00' East 9o 42.00' South|
|IBA criteria||A4i, A4ii, A4iii|
|Altitude||0 - 8m|
|Year of IBA assessment||2001|
Site description Cosmoledo is a raised coralline atoll in the Aldabra group, lying c.120 km east-south-east of Aldabra atoll, 700 km east of Africa and 400 km north-west of Madagascar. It comprises 13 islands and a few tiny islets (460 ha) surrounding a roughly circular lagoon (c.14,500 ha). The lagoon dries out extensively at low tide. Much of the interior of the atoll is characterized by irregular limestone formations known as ‘champignon’. The vegetation is similar to Aldabra (SC020), dominated by salt-resistant Pemphis acidula, but there are some extensive open grassy areas suitable for three species of ground-nesting seabirds not present on Aldabra (Sula dactylatra, S. leucogaster and Sterna fuscata). The islands of Menai and Grand Ile used to have resident human populations engaged in agriculture, fishing and the exploitation of seabirds, seabird eggs and turtles. However, the atoll has now been abandoned. It is visited by boats from both within Seychelles and from Comoros for the illegal poaching of seabirds, eggs and turtles. Two of the three largest islands (Grand Ile and Ile Sud Ouest) do not appear to have rats and, probably, most or even all islets are rat-free.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Red-tailed Tropicbird Phaethon rubricauda||breeding||-||50-200 breeding pairs||-||A4ii||Least Concern|
|Masked Booby Sula dactylatra||breeding||-||5,000-6,000 breeding pairs||-||A4ii||Least Concern|
|Red-footed Booby Sula sula||breeding||-||15,000 breeding pairs||-||A4ii||Least Concern|
|Crab-plover Dromas ardeola||winter||-||2,000 individuals||-||A4i||Least Concern|
|Ruddy Turnstone Arenaria interpres||winter||-||400 individuals||-||A4i||Least Concern|
|Greater Crested Tern Thalasseus bergii||breeding||-||100-500 breeding pairs||-||A4i||Least Concern|
|Black-naped Tern Sterna sumatrana||breeding||-||50-100 breeding pairs||-||A4i||Least Concern|
|Sooty Tern Onychoprion fuscatus||breeding||-||1,100,000 breeding pairs||-||A4i||Least Concern|
|A4iii Species group - waterbirds||breeding||-||2,500,000-4,999,999 individuals||unknown||A4iii|
|A4iii Species group - seabirds||breeding||-||20,000-49,999 individuals||unknown||A4iii|
|Land-use||Extent (% of site)|
Other biodiversity Green turtle Chelonia mydas (EN) nest all around the outside of the atoll. They have been heavily exploited and numbers are reduced.
References Feare (2000), Mortimer (1984), Rocamora and Skerrett (submitted), Rocamora et al. (submitted), Skerrett (1996b, 1999), Stoddart (1984).
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Recommended citation BirdLife International (2014) Important Bird Areas factsheet: Cosmoledo atoll. Downloaded from http://www.birdlife.org on 16/09/2014
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