Data Zone
Justification of Red List category
The population size is suspected to number fewer than 10,000 mature individuals functioning as a single subpopulation and is precautionarily suspected to be declining slowly in line with habitat loss and degradation within the range. It therefore qualifies as Near Threatened, approaching the thresholds under Criterion C.
Population justification
The global population size has not been quantified and there are very few records, but the species is described as rare and appears to occur at very low densities (though it is likely to be overlooked). The total population has been suggested to number only in the hundreds, though the existing pattern of records suggest the limits of its distribution are extensive and the population may be in four figures (Ferguson-Lees and Christie 2001). The number of mature individuals is here tentatively placed within the band 2,500-9,999.
Trend justification
The population is precautionarily suspected to be declining slowly based on ongoing habitat loss and degradation caused by logging. Forest cover extent in this species' range reduced by c. 3% overall in the three generations to 2022 (Global Forest Watch 2023, based on data from Hansen et al. [2013] and methods disclosed therein), and increased rates between 2018-2022 suggest forest loss is currently ongoing at a rate equivalent to 4-5% over three generations. Tentatively, declines are placed in the range 1-9% in three generations and are suspected to continue.
Erythrotriorchis buergersi is a rare and little-known species, endemic to New Guinea (Indonesia and Papua New Guinea). It is known only from a handful of records, all from eastern New Guinea except for a single record from the Foya Mountains in Papua (Pratt 1982, Coates 1985, Diamond 1985, Beehler et al. 1986, K. D. Bishop in litt. 1999, P. Gregory in litt. 1999, Beehler and Pratt 2016).
Hill and lower mountain forest, probably generally lower than Accipiter meyerianus, at 450-1,580 m (Beehler and Pratt 2016).
Most of its habitat is unsuitable for logging and it is apparently unlikely to be hunted (B. Finch in litt. 1994), however remote sensing data indicate that forest loss is ongoing slowly within its range (Global Forest Watch 2023, using Hansen et al. [2013] data and methods disclosed therein).
Conservation Actions Underway
CITES Appendix II.
Text account compilers
Vine, J.
Contributors
Bishop, K.D., Finch, B. & Gregory, P.
Recommended citation
BirdLife International (2024) Species factsheet: Chestnut-shouldered Goshawk Erythrotriorchis buergersi. Downloaded from
https://datazone.birdlife.org/species/factsheet/chestnut-shouldered-goshawk-erythrotriorchis-buergersi on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 22/12/2024.