JP081
Hachijojima island


IBA Justification

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
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

IBA Conservation

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 low
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
Pollution 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 No management planning has taken place Substantive conservation measures are being implemented, but these are not compre­hensive and are limited by resources and capacity low

IBA Protection

Year Protected Area Designation (management category) % coverage of IBA
1936 Fuji hakone izu 国立公園 (V) 100
1965 Hachijo miharayama 都道府県指定鳥獣保護区 (IV) 8
1965 Hachijo fuji 都道府県指定鳥獣保護区 (IV) 7
1965 Koiwa togahana 都道府県指定鳥獣保護区 (IV) 3

Habitats

Habitat % of IBA Habitat detail
Forest -
Marine Coastal/Supratidal -


Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Hachijojima island (Japan). Downloaded from https://datazone.birdlife.org/site/factsheet/hachijojima-island-iba-japan on 23/12/2024.