Justification of Red List Category
This species has a very large range, and hence does not 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 is not known, but the population is not believed to be decreasing sufficiently rapidly to approach the thresholds 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.
The global population size has not been quantified, but the species is generally described as uncommon in the Philippines, rare on the Chinese mainland, common on Taiwan and scarce on the Kurile islands and Sakhalin (Feare and Craig 1998). National population estimates include: c.50-1,000 individuals on migration and < c.50 wintering individuals in Taiwan; c.100-100,000 breeding pairs and c.50-10,000 individuals on migration in Japan and c.100-10,000 breeding pairs and c.50-1,000 individuals on migration in Russia (Brazil 2009).
The population trend is difficult to determine because of uncertainty over the impacts of habitat modification on population sizes.
Text account compilers
Ekstrom, J., Butchart, S.
BirdLife International (2020) Species factsheet: Agropsar philippensis. Downloaded from http://www.birdlife.org on 04/04/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 04/04/2020.