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 |
|---|---|---|---|---|
| Whimbrel Numenius phaeopus | LC | passage (2003) | present | A4i |
| Terek Sandpiper Xenus cinereus | LC | passage (2003) | present | A4i |
| Grey-tailed Tattler Tringa brevipes | LC | passage (2003) | present | A4i |
| Saunders's Gull Saundersilarus saundersi | VU | winter (2003) | present | A1 |
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 | high | very low |
| 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 Intertidal | good (>90%) | moderate (70–90%) | moderate |
| Pressure (threats to the trigger species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Residential and commercial development | happening now | some of population/area (10–49%) | moderate decline (10–30% over 3 generations) | high |
| Biological resource use | likely in long term (>4 years) | some of population/area (10–49%) | slow decline (1–10% over 3 generations) | medium |
| Invasive and other problematic species and genes | likely in long term (>4 years) | some of population/area (10–49%) | slow decline (1–10% over 3 generations) | medium |
| Energy production and mining | happening now | few individuals/small area (<10%) | rapid decline (>30% over 3 generations) | low |
| Human intrusions and disturbance | past (and unlikely to return) and no longer limiting | some of population/area (10–49%) | no or slight decline (<1% over 3 generations) | low |
| Response (conservation actions taken for the trigger species and/or their habitats) | |||
|---|---|---|---|
| Designation | Planning | Action | Result |
| Little/none of area covered (<10%) | No management planning has taken place | Some limited conservation initiatives are in place | very low |
| Year | Protected Area | Designation (management category) | % coverage of IBA |
|---|---|---|---|
| 1954 | Oita Prefectural Fisheries Coordination Regulations Article35(1)(i) | 保護水面 (IV) | 1 |
| 1966 | Oita Prefectural Fisheries Coordination Regulations Article35(1)(ii) | 保護水面 (IV) | 1 |
| 1966 | Oita Prefectural Fisheries Coordination Regulations Article35(1)(iii) | 保護水面 (IV) | 1 |
| 1973 | Fudokinooka | 都道府県指定鳥獣保護区 (IV) | 1 |
| 1979 | Buzenkai | 沿岸水産資源開発区域 (VI) | 89 |
| 1980 | Yamakunigawa | 都道府県指定鳥獣保護区 (IV) | 5 |
| 1981 | Hachiya | 都道府県指定鳥獣保護区 (IV) | 10 |
| 2003 | Common fishery right area(Fukuoka) | 共同漁業権区域 (VI) | 10 |
| 2004 | Common fishery right area(Oita) | 共同漁業権区域 (VI) | 88 |
| Habitat | % of IBA | Habitat detail |
|---|---|---|
| Marine Intertidal | major (>10) | |
| Marine Neritic | major (>10) |
Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Nakatsu and Usa tidal flats (Japan). Downloaded from
https://datazone.birdlife.org/site/factsheet/nakatsu-and-usa-tidal-flats-iba-japan on 23/12/2024.