Aldabra Special Reserve

IBA Criteria

Year of most recent IBA criteria assessment: 2001

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Red-tailed Tropicbird Phaethon rubricauda LC breeding - 1,900 breeding pairs A4ii
White-tailed Tropicbird Phaethon lepturus LC breeding - 2,500 breeding pairs A4ii
Comoro Blue-pigeon Alectroenas sganzini NT resident 1999 present A2
Madagascar Pond-heron Ardeola idae EN breeding - 20-50 breeding pairs A1, A4i
Western Reef-egret Egretta gularis LC breeding - 1,000-3,000 breeding pairs A4i
Lesser Frigatebird Fregata ariel LC breeding - 6,000 breeding pairs A4ii
Great Frigatebird Fregata minor LC breeding - 4,000 breeding pairs A4ii
Red-footed Booby Sula sula LC breeding - 6,000-7,000 breeding pairs A4ii
Ruddy Turnstone Arenaria interpres LC winter - 500-1,000 individuals A4i
Crab-plover Dromas ardeola LC non-breeding - 2,800 individuals A4i
Black-naped Tern Sterna sumatrana LC breeding - 70-150 breeding pairs A4i
Aldabra Drongo Dicrurus aldabranus NT resident 1999 present A1, A2
Aldabra Brush-warbler Nesillas aldabrana EX resident 1983 present A1, A2
Aldabra Fody Foudia aldabrana EN resident 1999 present A2
A4iii Species group - seabirds n/a breeding - 50,000-99,999 individuals A4iii

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2001 medium not assessed medium
Was the whole site covered? No State assessed by unset
Accuracy of information -

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Biological resource use fishing & harvesting aquatic resources - unintentional effects: large scale happening now small area/few individuals (<10%) no or imperceptible deterioration low
Biological resource use hunting & collecting terrestrial animals - intentional use (species being assessed is the target) happening now small area/few individuals (<10%) no or imperceptible deterioration low
Invasive and other problematic species and genes invasive non-native/alien species/diseases - named species happening now some of area/population (10-49%) slow but significant deterioration medium

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>90%) covered by appropriate conservation designation No management plan exists but the management planning process has begun Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity medium
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Aldabra Atoll Ramsar Site, Wetland of International Importance 43,900 protected area overlaps with site 0
Aldabra Atoll World Heritage Site (natural or mixed) 35,000 protected area contained by site 33,180
Aldabra Special Reserve 35,000 protected area overlaps with site 33,180

Land use

Land-use Extent (% of site)
nature conservation and research -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Aldabra Special Reserve. Downloaded from on 03/12/2022.