CV011
Raso Islet Integral Natural Reserve


IBA Justification

The site was identified as internationally important for bird conservation in 2022 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:
Species Red List Season (year/s of estimate) Size IBA criteria
Red-billed Tropicbird Phaethon aethereus LC breeding (2020–2022) 182–274 mature individuals A4
Cape Verde Shearwater Calonectris edwardsii NT breeding (2018) 13,088 mature individuals A4, B1a
Audubon's Shearwater Puffinus lherminieri LC breeding (2019) 510 mature individuals B3a
Bulwer's Petrel Bulweria bulwerii LC breeding (2020) 83,982 mature individuals A4
Raso Lark Alauda razae CR resident (1998) present A1, A2
Cape Verde Sparrow Passer iagoensis LC resident (1996) present A2
A4iii Species group - seabirds n/a breeding (2018–2022) 98,597–98,814 mature individuals B3b

IBA Conservation

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2022. The most recent assessment (2022) is shown below.

IBA conservation assessment
Year of assessment State Pressure Response
2022 good high not assessed
Whole site assessed? State assessed by Accuracy of information
yes population medium

State (condition of the trigger species' populations)
Species Actual vs Reference (units) % remaining Result
Red-billed Tropicbird Phaethon aethereus 274 / 40 (mature individuals) 100 good
Cape Verde Storm-petrel Hydrobates jabejabe 233 / 233 (mature individuals) 100 good
Cape Verde Shearwater Calonectris edwardsii 13,088 / 13,088 (mature individuals) 100 good
Audubon's Shearwater Puffinus lherminieri 510 / 510 (mature individuals) 100 good
Bulwer's Petrel Bulweria bulwerii 83,982 / 83,982 (mature individuals) 100 good
Red-footed Booby Sula sula 133 / 133 (mature individuals) 100 good
Brown Booby Sula leucogaster 594 / 594 (mature individuals) 100 good

Pressure (threats to the trigger species and/or their habitats)
Threat Timing Scope Severity Result
Human intrusions and disturbance happe­ning now most of popul­ation/area (50–90%) moderate decline (10–30% over 3 gener­ations) high

Response (conservation actions taken for the trigger species and/or their habitats)
Designation Planning Action Result
Not assessed Not assessed Not assessed not assessed

IBA Protection

Year Protected Area Designation (management category) % coverage of IBA
1990 Ilheu Raso Nature Reserve (-) 100

Land use

Land use % of IBA
nature conservation and research -
other -


Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Raso Islet Integral Natural Reserve (Cape Verde). Downloaded from https://datazone.birdlife.org/site/factsheet/raso-islet-integral-natural-reserve--iba-cape-verde on 23/12/2024.