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Location Equatorial Guinea, Annobón
Central coordinates 5o 38.00' East  1o 26.00' South
IBA criteria A1, A2, A4i
Area 23,000 ha
Altitude 0 - 613m
Year of IBA assessment 2001

Site description Annobón is a volcanic island of 2,088 ha and is surrounded by a number of scattered rocky islets, all within 2.5 km of the shore. The site includes the whole island, the islets and surrounding seas up to three nautical miles offshore. The coastline is rugged with a predominantly rocky coast and a few small beaches. Forest, including the now-abandoned cocoa and coffee plantations, covers around 75% of the island. The Natural Reserve, and the IBA, includes the surrounding sea to a distance of three nautical miles.

Key Biodiversity See Box and Table 2 for key species. Although information on Annobón’s birds has been recently updated, the last complete survey was undertaken in the 1950s. Nineteen species of bird have been so far been recorded, of which 12 are thought to be resident; only eight are terrestrial species. In addition to that listed below, other breeding seabirds include Sula leucogaster, Phaethon lepturus (50 pairs), Sterna anaethetus (200 pairs) and Anous stolidus (1,500 pairs).

Non-bird biodiversity: Fourteen angiosperm plants, nine land-snails and two reptiles are endemic to the island and a further six plants, three land-snails and one reptile occur which are endemic to more than one of the Gulf of Guinea islands. At least two species of turtle—Eretmochelys imbricata (CR) and Dermochelys coriacea (EN)—nest on the beaches of Annobón. The whales Balaenoptera musculus (EN), B. physalis (EN), B. borealis (EN) and Megaptera novaeangliae (VU) reach the offshore coasts of Annobón.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Black Noddy Anous minutus breeding  13,500 breeding pairs  A4i  Least Concern 
Sao Tome Bronze-naped Pigeon Columba malherbii resident  2000  present  A2  Near Threatened 
Annobon White-eye Zosterops griseovirescens resident  2000  present  A1, A2  Vulnerable 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Annobón Natural Reserve 23,000 is identical to site 23,000  

Land use

Land-use Extent (% of site)
fisheries/aquaculture -
hunting -
nature conservation and research -
tourism/recreation -
other -
Notes: Firewood collection; collection of eggs, particularly Sula leucogaster.
not utilised -

References Basilio (1957), Fry (1961), Gascoigne (1994), Harrison (1990), Jones (1994), Pérez del Val (2001), Peris (1961), Robins (1966).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Annobón. Downloaded from on 28/10/2016

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