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Location Antarctica
Central coordinates 64o 14.78' West  64o 39.04' South
IBA criteria A4ii
Area 39 ha
Altitude 0 - 250m
Year of IBA assessment 2015

Site description A small (41 ha) ice-free islet of low relief lies 0.5 km from the west coast of Anvers Island, and ~4.5 km to the south of Gerlache Island in the Rosenthal Islands. A large Gentoo Penguin colony is located on the island, and the IBA extent is defined by the island coastline.

Information on the environment at this island is not available, although the geology is likely to be similar to that on Anvers Island, which has granitic and volcanic origins.

The nearest permanent scientific station is Palmer (US), situated ~20 km to the east at Arthur Harbour, southern Anvers Island. See Ant012 for more information on Palmer Station and local climate.

Key Biodiversity A Gentoo Penguin (Pygoscelis papua) colony of ~3000 pairs was recorded on the islet in 1987 (Poncet & Poncet 1987). There is no information on any other birds breeding at this site.

Non-bird biodiversity: Southern Giant Petrels (Macronectes giganteus) are known to breed on the west coast of Anvers Island (W. Fraser, pers. comm., 2006). See Ant 012 for information on other species observed in the region.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Gentoo Penguin Pygoscelis papua breeding  1987  3,000 breeding pairs  medium  A4ii  Near Threatened 

Protection status ASMA No.7

References ASMA No. 7 Palmer Basin and Southwest Anvers Island: Management Plan (2008); Palmer LTER project URL:, accessed: 04/08/2010.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Islet south of Gerlache Island. Downloaded from on 27/10/2016

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