Data Zone
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 very 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.
Population justification
The global population is suspected to number 50,000-499,999 mature individuals (Partners in Flight 2022).
Trend justification
The species is becoming rarer in areas where forests are degraded and disturbed (Schafer 2020). Based on ongoing deforestation within the range a continuing decline is inferred (Partners in Flight 2022, Pollock et al. 2022, Global Forest Watch 2023).
Tree cover within the range is lost at a rate of 9-11% over ten years (Global Forest Watch 2023, using Hansen et al. [2013] data and methods disclosed therein). Due to the species' low tolerance of habitat degradation, population declines may be steeper than the rate of tree cover loss suggests. They are here tentatively placed in the band 15-19% over ten years.
The species occurs from southern Mexico through Central America south to Ecuador and extreme northern Peru.
It inhabits lowland, humid forest, where it prefers the understory of primary forests, mostly near water (Schafer 2020). Even though it can sometimes be found in adjacent secondary growth it is strongly associated with forest interior and is much rarer in disturbed and successional forests (Schafer 2020).
The main threat to the species is the large-scale loss of forests within the range for agricultural expansion.
Conservation Actions Underway
No targeted actions are known for this species.
Conservation Actions Proposed
Carefully monitor the population trend to detect any potential acceleration of the decline. Protect areas of suitable habitat within the range.
Text account compilers
Hermes, C.
Contributors
Butchart, S., Fisher, S. & Miller, E.
Recommended citation
BirdLife International (2024) Species factsheet: Sulphur-rumped Flycatcher Myiobius sulphureipygius. Downloaded from
https://datazone.birdlife.org/species/factsheet/sulphur-rumped-flycatcher-myiobius-sulphureipygius on 26/11/2024.
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 26/11/2024.