IUCN threat status:

Near Threatened (NT)

Distribution

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Range Description

Apalopteron familiare is endemic to the Ogasawara Islands, Japan, where it has been recorded from all three island groups, the Mukojima, Chichijima and Hahajima Islands. The nominate subspecies is now probably extinct, having been confined to Mukojima and not observed since the 1930s (del Hoyo et al. 2008). The species has also been extirpated from Chichijima (Suzuki and Morioka 2005). On Hahajima, it occurs on the main island and two small satellite islandsImotojima and Mukohjima (Kawakami et al. 2008, Kawakami and Higuchi 2013), with the majority of the population found on the main island. Analysis of DNA reveals that dispersal between the islands is very rare and that they should be regarded as three distinct populations (Kawakami et al. 2008). This species's populations have been estimated at c.14,700 mature individuals on Hahajima, c.480 mature individuals on Mukohjima and c.420 mature individuals on Imotojima, based on data collected in the late 1990s (Kawakami and Higuchi 2013). Following considerable historical losses, the range and population are now thought to be stable. Kawakami and Higuchi (2013) conducted a population viability analysis and found that the probability of extinction for the main (Hahajima) population remained at 0% even when the carrying capacity decreased to 10% of its present value. The other two small populations were found to be more sensitive to any decrease in breeding success rate or carrying capacity (Kawakami and Higuchi 2013).

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Source: IUCN

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