Justification of Red List Category
This species has an extremely 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). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is extremely large, and hence does not 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 is estimated to number 12,000,000 mature individuals (Partners in Flight 2019).
The species has been undergoing a large decline at an average rate of 3.1% per year between 1970 and 2017 (Partners in Flight 2019). Short-term trends however suggest that the decline has slowed down considerably in recent years and that the population has been stable or even increasing since 2010 (Pardieck et al. 2018). Given the uncertainty surrounding the trend estimate, the species is tentatively considered to be in decline, but the rate of decline is not considered to approach the threshold for Vulnerable over the relevant three generation time periods for this assessment.
Text account compilers
Butchart, S., Ekstrom, J., Meehan, T. & Westrip, J.R.S.
BirdLife International (2022) Species factsheet: Calamospiza melanocorys. Downloaded from http://www.birdlife.org on 28/06/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 28/06/2022.