Data Zone
The site was identified as important 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 List1 | Season | Year(s) | 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 individuals | A4iii |
1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2004) may differ.
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 | near favourable | 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%) | near favourable |
| Pressure (threats to the trigger species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Transportation and service corridors | happening now | some of area/population (10-49%) | slow but significant deterioration | medium |
| Natural system modifications | happening now | small area/few individuals (<10%) | moderate to rapid deterioration | low |
| Response (conservation actions taken for the trigger species and/or their habitats) | |||
|---|---|---|---|
| Protected areas | Management plan | Other 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 |
| Year | Protected Area | Designation | % overlap with IBA |
|---|---|---|---|
| 1974 | Nakaumi | 国指定鳥獣保護区 | 85 |
| 1984 | Nakaumi | Prefectural Wildlife Protection Area | 88 |
| 2005 | Nakaumi | Ramsar Site, Wetland of International Importance | 80 |
| Habitat1 | Habitat detail | % of IBA |
|---|---|---|
| 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 22/11/2024.