Data Zone
The site was identified as internationally important for bird conservation in 2004 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.
Populations meeting IBA criteria ('trigger species') at the site:| Species | Red List | Season (year/s of estimate) | Size | IBA criteria |
|---|---|---|---|---|
| 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 birds | A4iii |
Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2004. The most recent assessment (2015) is shown below.
| IBA conservation assessment | |||
|---|---|---|---|
| Year of assessment | State | Pressure | Response |
| 2015 | moderate | medium | high |
| Whole site assessed? | State assessed by | Accuracy of information | |
| yes | habitat | - | |
| State (condition of the trigger species' habitats) | |||
|---|---|---|---|
| Habitat | Quantity (% remaining) | Quality (% carrying capacity) | Result |
| Marine Coastal/Supratidal | good (>90%) | moderate (70–90%) | moderate |
| Pressure (threats to the trigger species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Transportation and service corridors | happening now | some of population/area (10–49%) | slow decline (1–10% over 3 generations) | medium |
| Natural system modifications | happening now | few individuals/small area (<10%) | moderate decline (10–30% over 3 generations) | low |
| Response (conservation actions taken for the trigger species and/or their habitats) | |||
|---|---|---|---|
| Designation | Planning | Action | Result |
| Most of area (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 |
| Year | Protected Area | Designation (management category) | % coverage of IBA |
|---|---|---|---|
| 1974 | Nakaumi | 国指定鳥獣保護区 (IV) | 85 |
| 1984 | Nakaumi | Prefectural Wildlife Protection Area (-) | 88 |
| Habitat | % of IBA | Habitat detail |
|---|---|---|
| Marine Coastal/Supratidal | major (>10) |
Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Lake Nakaumi (Japan). Downloaded from
https://datazone.birdlife.org/site/factsheet/lake-nakaumi-iba-japan on 28/12/2024.