| |
Estimate |
Data quality |
Derivation |
Year of estimate |
| No. of mature individuals |
1000-2499 |
medium |
Estimated |
2005 |
| Population trend |
Decreasing |
poor |
|
- |
| Number of subpopulations |
2-100 |
- |
- |
- |
| Largest subpopulation |
50-249 |
- |
- |
- |
| Generation length (yrs) |
5.4 |
- |
- |
- |
|
Population justification: Surveys in 1996 and 1997 estimated densities of 0.48 and 0.24 calling males per km2, respectively. The total area of suitable habitat within its known range was then estimated at 1,793 km2, and on the basis of densities recorded, and the assumption that each calling male represents one pair, the total population was estimated at 860-1,722 birds. However, it was recorded at several new sites between 1998 and 2002 and more recent surveys at Laojunshan Nature Reserve at the eastern edge of its range recorded densities of 4.24 ±1.77; 0.6 calling males per km2. Although reliable, this is the highest density recorded for this species and it is known to occur at much lower densities further west, so it is probable that Laojunshan represents optimal habitat within the bird's preferred altitudinal range (about 1000 to 2000 m). Nevertheless, the 1996/7 population estimate is likely to be too low, hence it is best placed in the band 1,000-2,499 mature individuals. This equates to 1,500-3,749 individuals in total, rounded here to 1,500-4,000 individuals. |
|
Trend justification: The species is suspected to be in on-going decline owing to hunting and small-scale habitat loss through agriculture, illegal logging, and also disturbance from bamboo shoot and medicinal plant collectors. The likely rate of decline, however, has not been estimated. |
| Threat (level 1) |
Threat (level 2) |
Impact and Stresses |
| Agriculture & Aquaculture |
Annual & perennial non-timber crops / Small-holder farming |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion, Species mortality |
|
| Agriculture & Aquaculture |
Annual & perennial non-timber crops / Small-holder farming |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion, Species mortality |
|
| Agriculture & Aquaculture |
Livestock farming & ranching / Small-holder grazing, ranching or farming |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Negligible declines |
Low Impact: 4 |
| Stresses |
|---|
| Species disturbance, Ecosystem degradation, Ecosystem conversion |
|
| Agriculture & Aquaculture |
Livestock farming & ranching / Small-holder grazing, ranching or farming |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Negligible declines |
Low Impact: 4 |
| Stresses |
|---|
| Species disturbance, Ecosystem degradation, Ecosystem conversion |
|
| Biological resource use |
Fishing & harvesting aquatic resources / Unintentional effects: (large scale) |
Timing |
Scope |
Severity |
Impact |
| Past, Unlikely to Return |
Majority (50-90%) |
Rapid Declines |
Past Impact |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion, Species mortality |
|
| Biological resource use |
Fishing & harvesting aquatic resources / Unintentional effects: (large scale) |
Timing |
Scope |
Severity |
Impact |
| Past, Unlikely to Return |
Majority (50-90%) |
Rapid Declines |
Past Impact |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion, Species mortality |
|
| Biological resource use |
Fishing & harvesting aquatic resources / Unintentional effects: (large scale) |
Timing |
Scope |
Severity |
Impact |
| Past, Unlikely to Return |
Majority (50-90%) |
Rapid Declines |
Past Impact |
| Stresses |
|---|
| Species disturbance, Ecosystem degradation, Ecosystem conversion |
|
| Biological resource use |
Fishing & harvesting aquatic resources / Unintentional effects: (subsistence/small scale) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Slow, Significant Decline |
Low Impact: 5 |
| Stresses |
|---|
| Ecosystem degradation, Ecosystem conversion |
|
| Biological resource use |
Gathering terrestrial plants / Unintentional effects (species is not the target) |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Negligible declines |
Low Impact: 4 |
| Stresses |
|---|
| Species disturbance |
|
| Natural system modifications |
Dams & water management/use / Large dams |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Negligible declines |
Low Impact: 4 |
| Stresses |
|---|
| Species disturbance, Ecosystem degradation, Ecosystem conversion |
|
| Natural system modifications |
Dams & water management/use / Large dams |
Timing |
Scope |
Severity |
Impact |
| Ongoing |
Minority (<50%) |
Negligible declines |
Low Impact: 4 |
| Stresses |
|---|
| Species disturbance, Ecosystem degradation, Ecosystem conversion |
|
This information is based upon, and updates, the information published in BirdLife International (2000)
Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004)
Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.
To provide new information to update this factsheet or to correct any errors, please email BirdLife
To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.
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