JP148
Birojima islet


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 Murrelet Synthliboramphus wumizusume VU breeding 2003 present A1, A4ii
Pleske's Grasshopper-warbler Helopsaltes pleskei VU breeding 2003 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 medium near favourable low
Was the whole site covered? Yes State assessed by Habitat
Accuracy of information -

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Biological resource use hunting & collecting terrestrial animals - unintentional effects (species is not the target) happening now small area/few individuals (<10%) no or imperceptible deterioration low
Climate change and severe weather storms and floods happening now some of area/population (10-49%) slow but significant deterioration medium
Human intrusions and disturbance recreational activities happening now small area/few individuals (<10%) slow but significant deterioration low
Pollution garbage & solid waste likely in long term (beyond 4 years) small area/few individuals (<10%) no or imperceptible deterioration low

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%) moderate (70-90%) 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 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
For more information about IBA monitoring please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Nippokaigan 国定公園 8,518 protected area contains site 8
Makiyama 都道府県指定鳥獣保護区 1,457 protected area contains site 0
Common fishery right area(Miyazaki) 共同漁業権区域 37,323 protected area overlaps with site 0
Birojima 国指定鳥獣保護区 482 protected area contains site 0

Habitats

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


Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Birojima islet. Downloaded from http://www.birdlife.org on 07/02/2023.