Justification of Red List Category
Although this species may have a small range, it is not believed to approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern. Given the highly restricted range, any evidence of declines or significant threats would likely result in reassessment of this classification.
The population size has not been estimated, but if it as adaptable and frequent within its range as P. asiaticus its population may not be very small, despite its highly restricted range.
It occurs in at least one conservation area (Khao Luang) and has not been considered at risk except on the basis of its restricted range (Wells 1999, del Hoyo et al. 2002). The population is therefore suspected to be stable in the absence of evidence for any declines or substantial threats (del Hoyo et al. 2007).
Psilopogon chersonesus is restricted to east peninsular Thailand, where it is present from the Surat Thani/Nakhon Si Thammarat divide south to the limit of montane forest at 8??15?N (Wells 1999). It is apparently not uncommon within its small range (del Hoyo et al. 2002). It occurs in montane forest from 885 m to at least 1,520 m (Wells 1999) within an Extent of Occurrence estimated at c.850 km2.
Text account compilers
Butchart, S., Ekstrom, J., Symes, A. & Taylor, J.
BirdLife International (2019) Species factsheet: Psilopogon chersonesus. Downloaded from http://www.birdlife.org on 14/12/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 14/12/2019.