Data Zone
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 |
|---|---|---|---|---|---|
| Tundra Swan Cygnus columbianus | LC | winter | 2003 | present | A4i |
| Common Pochard Aythya ferina | VU | winter | 2003 | present | A4i |
| Tufted Duck Aythya fuligula | LC | winter | 2003 | present | A4i |
| Greater Scaup Aythya marila | LC | winter | 2003 | present | A4i |
| A4iii Species group - waterbirds | n/a | winter | 2003 | 50,000-75,000 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
| Most recent IBA monitoring assessment | |||
|---|---|---|---|
| Year of assessment | Threat score (pressure) | Condition score (state) | Action score (response) |
| 2015 | medium | near favourable | high |
| 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 |
| Natural system modifications | other ecosystem modifications | happening now | small area/few individuals (<10%) | moderate to rapid deterioration | low |
| Transportation and service corridors | roads and railroads | happening now | some of area/population (10-49%) | slow but significant deterioration | medium |
| 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 | good (> 90%) | moderate (70-90%) | near favourable | |
| Conservation actions taken at site (response) | |||
|---|---|---|---|
| Conservation Designation | Management Planning | Conservation Action | Result |
| Most of site (50-90%) covered (including the most critical parts for important bird species) | A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species | The conservation measures needed for the site are being comprehensively and effectively implemented | high |
| Protected Area | Designation | Area (ha) | Relationship with IBA | Overlap with IBA (ha) |
|---|---|---|---|---|
| Nakaumi | 国指定鳥獣保護区 | 8,724 | protected area overlaps with site | 8,462 |
| Nakaumi | Ramsar Site, Wetland of International Importance | 8,043 | protected area contained by site | 8,043 |
| Nakaumi | Prefectural Wildlife Protection Area | 8,800 | protected area contained by site | 8,800 |
| IUCN Habitat | Habitat detail | Extent (% of site) |
|---|---|---|
| Marine Coastal/Supratidal | - |
Recommended citation
BirdLife International (2023) Important Bird Areas factsheet: Lake Nakaumi. Downloaded from
http://www.birdlife.org on 27/03/2023.
