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Okinoshima and Koyajima islets


IBA Criteria

Year of most recent IBA criteria assessment: 2004

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Japanese Woodpigeon Columba janthina NT resident 2004 present A2
Streaked Shearwater Calonectris leucomelas NT breeding 2004 present A4ii
Japanese Murrelet Synthliboramphus wumizusume VU breeding 2004 present A1, A4ii
Pleske's Grasshopper-warbler Locustella pleskei VU breeding 2004 present A1

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here


IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2015 high not assessed medium
Was the whole site covered? Yes State assessed by unset
Accuracy of information -

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Invasive and other problematic species and genes invasive non-native/alien species/diseases - named species likely in long term (beyond 4 years) whole area/population (>90%) moderate to rapid deterioration high

Condition of habitat (state)
Habitat Habitat Detail Reference Area (ha) Actual Area (ha) % of habitat remaining % of carrying capacity (overall) Result
Forest 0 0 - good (> 90%) near favourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Whole area of site (>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 Very little or no conservation action taking place medium
For more information about IBA monitoring please click here

IBA Protection

Protection status:

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Okinoshima 国指定鳥獣保護区 97 protected area overlaps with site 97
Okinoshima 都道府県自然環境保全地域 94 protected area overlaps with site 0
Common fishery right area(Fukuoka) 共同漁業権区域 127,630 protected area overlaps with site 0

Habitats

IUCN Habitat Habitat detail Extent (% of site)
Forest -
Coastline Sea cliffs and rocky shores -
For further information about the habitat classification please click here.


Recommended citation
BirdLife International (2020) Important Bird Areas factsheet: Okinoshima and Koyajima islets. Downloaded from http://www.birdlife.org on 26/09/2020.