JP074
Inner Tokyo bay


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
Greater Scaup Aythya marila LC winter 2004 present A4i
Great Cormorant Phalacrocorax carbo LC winter 2004 present A4i
Grey Plover Pluvialis squatarola LC winter 2004 present A4i
Whimbrel Numenius phaeopus LC passage 2004 present A4i
Ruddy Turnstone Arenaria interpres LC passage 2004 present A4i
Sanderling Calidris alba LC passage 2004 present A4i
Dunlin Calidris alpina LC winter 2004 present A4i
Grey-tailed Tattler Tringa brevipes NT passage 2004 present A4i
A4iii Species group - waterbirds n/a winter 2004 min 20,000 individuals A4iii

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 low
Was the whole site covered? No State assessed by unset
Accuracy of information -

Threats to the site (pressure)
Threat Level 1 Threat Level 2 Timing Scope Severity Result
Human intrusions and disturbance recreational activities happening now some of area/population (10-49%) very rapid to severe deterioration high

Condition of habitat (state)
Habitat Habitat Detail Reference Area (ha) Actual Area (ha) % of habitat remaining % of carrying capacity (overall) Result
Wetlands (inland) 0 0 - poor (40-69%) very unfavourable

Conservation actions taken at site (response)
Conservation Designation Management Planning Conservation Action Result
Little/none of site covered (<10%) 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

Protection status:

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Yatsu-higata Ramsar Site, Wetland of International Importance 40 protected area overlaps with site 40
Yatsu 国指定鳥獣保護区 41 protected area overlaps with site 0
Tokyowan 都道府県指定鳥獣保護区 11,750 protected area overlaps with site 0
Tamagawa 都道府県指定鳥獣保護区 703 protected area overlaps with site 0
Tamagawa 都道府県指定鳥獣保護区 4,607 protected area overlaps with site 0
Gyotoku 都道府県指定鳥獣保護区 56 protected area overlaps with site 0
Common fishery right area(Chiba) 共同漁業権区域 106,306 protected area overlaps with site 0

Habitats

IUCN Habitat Habitat detail Extent (% of site)
Wetlands (inland) Estuarine waters -
For further information about the habitat classification please click here.


Recommended citation
BirdLife International (2020) Important Bird Areas factsheet: Inner Tokyo bay. Downloaded from http://www.birdlife.org on 22/09/2020.