Data Zone
The site was identified as internationally important for bird conservation in 2013 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 |
|---|---|---|---|---|
| Brown Booby Sula leucogaster | LC | breeding (2000) | 350–400 pairs | B4ii |
| Brown Noddy Anous stolidus | LC | breeding (1999) | 700 pairs | B4i |
| Bridled Tern Onychoprion anaethetus | LC | breeding (1999–2005) | 270 pairs | A4i |
Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2013. The most recent assessment (2015) is shown below.
| IBA conservation assessment | |||
|---|---|---|---|
| Year of assessment | State | Pressure | Response |
| 2015 | good | high | low |
| Whole site assessed? | State assessed by | Accuracy of information | |
| yes | population | good | |
| State (condition of the trigger species' populations) | |||||
|---|---|---|---|---|---|
| Species | Actual vs Reference (units) | % remaining | Result | ||
| Masked Booby Sula dactylatra | 12 / 12 (birds) | 100 | good | ||
| Brown Noddy Anous stolidus | 280 / 280 (birds) | 100 | good | ||
| Bridled Tern Onychoprion anaethetus | 120 / 120 (birds) | 100 | good | ||
| Pressure (threats to the trigger species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Climate change and severe weather | happening now | whole of population/area (>90%) | slow decline (1–10% over 3 generations) | high |
| Geological events | happening now | whole of population/area (>90%) | slow decline (1–10% over 3 generations) | high |
| Invasive and other problematic species and genes | happening now | whole of population/area (>90%) | slow decline (1–10% over 3 generations) | high |
| Pollution | happening now | whole of population/area (>90%) | slow decline (1–10% over 3 generations) | high |
| Residential and commercial development | happening now | some of population/area (10–49%) | slow decline (1–10% over 3 generations) | medium |
| Energy production and mining | happening now | few individuals/small area (<10%) | slow decline (1–10% over 3 generations) | low |
| Biological resource use | happening now | few individuals/small area (<10%) | no or slight decline (<1% over 3 generations) | low |
| Human intrusions and disturbance | happening now | few individuals/small area (<10%) | no or slight decline (<1% over 3 generations) | low |
| Transportation and service corridors | happening now | few individuals/small area (<10%) | no or slight decline (<1% over 3 generations) | low |
| Natural system modifications | past (and unlikely to return) and no longer limiting | most of population/area (50–90%) | moderate decline (10–30% over 3 generations) | low |
| Response (conservation actions taken for the trigger species and/or their habitats) | |||
|---|---|---|---|
| Designation | Planning | Action | Result |
| Whole area (>90%) covered by appropriate conservation designation | No management planning has taken place | Some limited conservation initiatives are in place | low |
| Year | Protected Area | Designation (management category) | % coverage of IBA |
|---|---|---|---|
| 2018 | Sombrero Island Nature Reserve Marine Park | Ramsar Site, Wetland of International Importance (II) | 100 |
| Habitat | % of IBA | Habitat detail |
|---|---|---|
| Marine Coastal/Supratidal | major (>10) | |
| Marine Neritic | major (>10) | |
| Shrubland | minor (<10) | Arid lowland scrub |
| Land use | % of IBA |
|---|---|
| urban/industrial/transport | major (>10) |
| fisheries/aquaculture | major (>10) |
| nature conservation and research | major (>10) |
Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Sombrero Island (Anguilla (to UK)). Downloaded from
https://datazone.birdlife.org/site/factsheet/sombrero-island-iba-anguilla-(to-uk) on 23/12/2024.