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 |
|---|---|---|---|---|---|
| Greater Scaup Aythya marila | LC | winter | 2003 | present | A4i |
| Grey-headed Lapwing Vanellus cinereus | LC | resident | 2003 | present | A4i |
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 | unfavourable | high | negligible |
| 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%) | poor (40-69%) | unfavourable |
| Pressure (threats to the trigger species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Agricultural expansion and intensification | happening now | majority/most of area/population (50-90%) | slow but significant deterioration | high |
| Energy production and mining | likely in short term (within 4 years) | small area/few individuals (<10%) | very rapid to severe deterioration | low |
| Response (conservation actions taken for the trigger species and/or their habitats) | |||
|---|---|---|---|
| Protected areas | Management plan | Other action | Result |
| Little/none of site covered (<10%) | No management planning has taken place | Some limited conservation initiatives are in place | negligible |
| Year | Protected Area | Designation | % overlap with IBA |
|---|---|---|---|
| 1958 | Mikawawan | 国定公園 | 2 |
| 2013 | Common fishery right area(Aichi) | 共同漁業権区域 | 23 |
| Habitat1 | Habitat detail | % of IBA |
|---|---|---|
| Marine Intertidal | major (>10) | |
| Marine Neritic | major (>10) |
Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Yahagigawa estuary (Japan). Downloaded from
https://datazone.birdlife.org/site/factsheet/yahagigawa-estuary-iba-japan on 23/11/2024.