Data Zone
The site was identified as internationally important for bird conservation in 2004 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 |
|---|---|---|---|---|
| Japanese Woodpigeon Columba janthina | LC | resident (2003) | present | A2 |
| Streaked Shearwater Calonectris leucomelas | NT | breeding (2003) | 2,000,000 birds | A4ii |
| Japanese Murrelet Synthliboramphus wumizusume | VU | breeding (2003) | present | A1, A4ii |
| Pleske's Grasshopper-warbler Helopsaltes pleskei | VU | breeding (2003) | present | A1 |
| Ijima's Leaf-warbler Phylloscopus ijimae | VU | breeding (2003) | present | A1, A2 |
| Izu Thrush Turdus celaenops | VU | resident (2003) | present | A1, A2 |
Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2004. The most recent assessment (2015) is shown below.
| IBA conservation assessment | |||
|---|---|---|---|
| Year of assessment | State | Pressure | Response |
| 2015 | moderate | high | medium |
| Whole site assessed? | State assessed by | Accuracy of information | |
| yes | habitat | - | |
| State (condition of the trigger species' habitats) | |||
|---|---|---|---|
| Habitat | Quantity (% remaining) | Quality (% carrying capacity) | Result |
| Forest | good (>90%) | moderate (70–90%) | moderate |
| Pressure (threats to the trigger species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Invasive and other problematic species and genes | 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 |
| Whole area (>90%) covered by appropriate conservation designation | A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species | Some limited conservation initiatives are in place | medium |
| Year | Protected Area | Designation (management category) | % coverage of IBA |
|---|---|---|---|
| 1936 | Fuji hakone izu | 国立公園 (V) | 100 |
| 1974 | Mikurajima | 都道府県指定鳥獣保護区 (IV) | 30 |
| Habitat | % of IBA | Habitat detail |
|---|---|---|
| Forest | - | |
| Marine Coastal/Supratidal | - |
Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Mikurajima island (Japan). Downloaded from
https://datazone.birdlife.org/site/factsheet/mikurajima-island-iba-japan on 23/12/2024.