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Location Antarctica
Central coordinates 45o 8.95' West  60o 47.50' South
IBA criteria A4i
Area 102 ha
Altitude 0 - 250m
Year of IBA assessment 2015

Site description The Robertson Islands group is separated from the southernmost point of Coronation Island by Whale Bay and The Divide, and comprises (from north to south): Matthews Island, Coffer Island, Steepholm Island, Skilling Island and Atriceps Island. The IBA covers all of Atriceps Island, which has an area of 110 ha.

Atriceps Island is ice-free for most of the year and has a maximum elevation of less than 250 m. Information on the environment at Atriceps Island is not available.. Conditions at nearby Signy Island are characterised by relatively low temperatures and high winds, With mean summer air temperatures between –2°C to 3°C, whilst during winter the mean monthy air temperature ranges from –2°C to –17° C (ASPA No. 114 Management Plan, 2003).

The nearest research station is Signy (UK), a summer-only facility located on the eastern coast of Signy Island 27 km northwest of the IBA, and which has capacity to accommodate ~10 people (COMNAP, Antarctic Facilities, accessed 31/08/2010).

Key Biodiversity Approximately 524 pairs of Imperial Shag (Phalacrocorax atriceps) were recorded breeding on Atriceps Island in 1988.

Non-bird biodiversity: None known.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Imperial Shag Phalacrocorax atriceps breeding  1988  524 breeding pairs  good  A4i  Least Concern 

Protection status None

References ASPA No.111 Southern Powell Island, South Orkney Islands: Management Plan (1994).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Atriceps Island, Robertson Islands. Downloaded from on 24/10/2016

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