IUCN threat status:

Endangered (EN)

Distribution

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Range Description

Zosterops conspicillatus is restricted to the Northern Mariana Islands (to U.S.A.) where it occurs on the islands of Saipan, Tinian and Aguijan. It is very abundant (it was the second most abundant breeding landbird caught in mist-nets during the TMAPS survey on Saipan in 2010 [Pyle et al. 2010]) and populations currently appear stable or increasing. On Saipan, the population was estimated to be 534,029 (95% CI: 427,858-650,667) birds in 2007, which was similar to estimates from 1982 and 1997 (Camp et al. 2009). Surveys of Tinian and Aguijuan were conducted in 2008. The population on Tinian (225,360 [95% CI: 192,080-283,200]) appears stable while the population on Aguijan (3,388 [95% CI – 2,492-4,909]) increased from estimates in 1982 (Camp et al., in press, Amidon et al., in prep). The population on Saipan is estimated to be more abundant in native limestone forest (c. 5,950 birds/km2) than in disturbed habitats (c. 4,000 birds/km2) (Craig 1996). The nominate subspecies, formerly found on Guam, was last recorded in 1983 and is now extinct (del Hoyo et al. 2008).

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Source: IUCN

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