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). 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 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 was described as common, prior to being split (del Hoyo et al. 2006).
This population is suspected to be in decline owing to rapid and ongoing logging of lowland forests on the Solomon Islands (del Hoyo et al. 2006).
Subspecies M. c. erythrostictus occurs in Buka, Bougainville and Shortland Is (NW Solomons, Papua New Guinea). Subspecies M. c. castaneiventris occurs in the Solomon Islands (Choiseul, Santa Isabel, Guadalcanal, Savo, Florida and Malaita). Subspecies M. c. obscurior occurs in Russell Is (EC Solomons).
Text account compilers
Butchart, S., Ekstrom, J. & Hardenbol, A.
BirdLife International (2022) Species factsheet: Monarcha castaneiventris. Downloaded from http://www.birdlife.org on 28/09/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 28/09/2022.