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 at site | 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: The current IUCN Red List category may differ from the category that was valid at the time of IBA criteria assessment.
For more information about the IBA criteria, please click here
| IBA conservation status - summary | |||
|---|---|---|---|
| Year of assessment (most recent) | Threat (pressure) | Condition (state) | Action (response) |
| 2015 | medium | near favourable | high |
| Was the whole site assessed? | yes | Condition (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 the site (state), by habitat | ||||||
|---|---|---|---|---|---|---|
| Habitat | Habitat detail | Reference area (ha) | Actual area (ha) | Habitat quantity (% remaining) | Habitat quality (carrying capacity) | Result |
| Wetlands (inland) | 0 | 0 | good (> 90%) | moderate (70-90%) | near favourable | |
| Conservation actions taken at the site (response) | |||
|---|---|---|---|
| Protected-area designation | Management planning | Other 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 (PA) | PA designation | PA area (ha) | Relationship of PA with IBA | Overlap of PA with IBA (ha) |
|---|---|---|---|---|
| Nakaumi | Prefectural Wildlife Protection Area | 8,800 | protected area contained by site | 8,800 |
| 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 |
| IUCN Habitat | Habitat detail | Extent (% of site) |
|---|---|---|
| Marine Coastal/Supratidal | - |
Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Lake Nakaumi. Downloaded from
http://datazone.birdlife.org/site/factsheet/15065 on 29/05/2023.
