| Citation |
BirdLife International. 2017. Ficedula hyperythra (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2017: e.T103769540A111167043. https://dx.doi.org/10.2305/IUCN.UK.2017-1.RLTS.T103769540A111167043.en. Downloaded on 30 May 2020. |
Description |
JUSTIFICATION 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 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. DESCRIPTION The global population size is unknown. The population in Taiwan has been estimated at c.10,000-100,000 breeding pairs (Brazil 2009). Trend Justification: The population is suspected to be in decline owing to the on-going destruction and degradation of the species forest habitat and the effects of introduced species. The likely rate of decline has not been estimated. |
