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Location High Seas
Central coordinates 53o 30.00' West  40o 26.75' South
IBA criteria A4ii, A4iii
Area 7,513,698 ha
Year of IBA assessment 2012

Site description This Marine IBA is identified using tracking data. It falls within High Seas International Waters and the Atlantic, Southwest FAO ocean region. The site covers an area of 75137 km2 and is 374 km away from the closet coastline. The depth ranges from 3934 to 5506 m, with a mean annual wind speed of 2.32 m/s, mean annual sea surface temperature falls between 11.81 and 19.56 °C and mean annual chlorophyll-a concentrations found to range between 0.24 and 0.82 mg/m3.

Key Biodiversity 1 species triggers IBA criteria at this Marine IBA. BirdLife analyses of tracking data estimates that 900000-7000000 individuals of Great Shearwater (LC) from Tristan da Cunha Islands are present at the site during the Non-breeding (Jan-Mar) life-history stage.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Great Shearwater Ardenna gravis non-breeding  2006  900,000-7,000,000 individuals  A4ii  Least Concern 
A4iii Species group - seabirds non-breeding  900,000-7,000,000 individuals  A4iii   


IUCN habitat Habitat detail Extent (% of site)
Sea   100%

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Atlantic, Southwest 34 - Marine. Downloaded from on 26/10/2016

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