Data Zone
The site was identified as internationally important for bird conservation in 2012 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 |
|---|---|---|---|---|
| Brown Noddy Anous stolidus | LC | breeding (1973) | 80,000 birds | A4i |
| Black Noddy Anous minutus | LC | breeding (1973) | 20,000 birds | A4i |
Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2012. The most recent assessment (2012) is shown below.
| IBA conservation assessment | |||
|---|---|---|---|
| Year of assessment | State | Pressure | Response |
| 2012 | not assessed | medium | very low |
| Whole site assessed? | State assessed by | Accuracy of information | |
| yes | population | poor | |
| State (condition of the trigger species' populations) | |||||
|---|---|---|---|---|---|
| Species | Actual vs Reference (units) | % remaining | Result | ||
| Brown Noddy Anous stolidus | 80,000 / 80,000 (birds) | 100 | not assessed | ||
| Black Noddy Anous minutus | 20,000 / 20,000 (birds) | 100 | not assessed | ||
| Pressure (threats to the trigger species and/or their habitats) | ||||
|---|---|---|---|---|
| Threat | Timing | Scope | Severity | Result |
| Climate change and severe weather | likely in long term (>4 years) | whole of population/area (>90%) | slow decline (1–10% over 3 generations) | medium |
| Invasive and other problematic species and genes | happening now | whole of population/area (>90%) | no or slight decline (<1% over 3 generations) | low |
| Biological resource use | happening now | 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 | Very little or no conservation action taking place | very low |
Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Tench Island (Papua New Guinea). Downloaded from
https://datazone.birdlife.org/site/factsheet/tench-island-iba-papua-new-guinea on 23/12/2024.