Justification of Red List Category
Although this species may have a restricted range, it is not believed to 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). The population trend is not known, but the population is not believed to be decreasing sufficiently rapidly to approach the thresholds 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 population of subspecies asuncionis is estimated to number 1,821 individuals on Sarigan alone, as well as occurring through the rest of the northern and central Northern Mariana Islands (to U.S.A.); subspecies saffordi has an estimated total population size of 63,120 individuals; subspecies kobayashii had an estimated total population size of 59,690 in 1991; subspecies kurodai is common, with a total population estimated to number 109,360 individuals; subspecies major has a total population estimated to number 165,440 individuals; subspecies dichromata has an estimated total population size of 358,070, and the nominate subspecies rubrata has a total population estimated to number 136,360 individuals. In total then the total population is estimated to number 850,000-900,000 individuals (the sum of individual estimates being 893,861).
Text account compilers
Ekstrom, J., Butchart, S. & Symes, A.
BirdLife International (2023) Species factsheet: Myzomela rubratra. Downloaded from http://www.birdlife.org on 24/03/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 24/03/2023.