Data Zone
The site was identified as important 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 List1 | Season | Year(s) | 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 |
1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2022) may differ.
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 | favourable | high | not assessed |
| Whole site assessed? | State assessed by | Accuracy of information | |
| yes | population | medium | |
| State (condition of the trigger species' populations) | |||||
|---|---|---|---|---|---|
| Species | Reference | Actual | Units | % remaining | Result |
| Red-billed Tropicbird Phaethon aethereus | 40 | 274 | mature individuals | 100 | favourable |
| Cape Verde Storm-petrel Hydrobates jabejabe | 233 | 233 | mature individuals | 100 | favourable |
| Cape Verde Shearwater Calonectris edwardsii | 13,088 | 13,088 | mature individuals | 100 | favourable |
| Audubon's Shearwater Puffinus lherminieri | 510 | 510 | mature individuals | 100 | favourable |
| Bulwer's Petrel Bulweria bulwerii | 83,982 | 83,982 | mature individuals | 100 | favourable |
| Red-footed Booby Sula sula | 133 | 133 | mature individuals | 100 | favourable |
| Brown Booby Sula leucogaster | 594 | 594 | mature individuals | 100 | favourable |
| Pressure (threats to the trigger species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Human intrusions and disturbance | happening now | majority/most of area/population (50-90%) | moderate to rapid deterioration | high |
| Response (conservation actions taken for the trigger species and/or their habitats) | |||
|---|---|---|---|
| Protected areas | Management plan | Other action | Result |
| Not assessed | Not assessed | Not assessed | not assessed |
| Year | Protected Area | Designation | % overlap with IBA |
|---|---|---|---|
| 1990 | Ilheu Raso | Nature Reserve | 100 |
| 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 23/11/2024.