IUCN threat status:

Critically Endangered (CR)

Distribution

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Range Description

Zosterops rotensis is endemic to Rota in the Northern Mariana Islands (to USA), where it was once thought to be common and widespread, but is now largely restricted to the upper escarpments of the Sabana plateau (J. Lepson in litt. 1999), where it is found in mature wet forest above 200 m. In 1982, it was estimated to have a population of 10,763 individuals (Engbring et al. 1986). Since then, surveys have estimated 300-1,500 birds (1990) (Craig and Taisacan 1994), 1,165 birds with 94% of the population restricted to four patches of forest covering only 259 ha (1996) (Fancy and Snetsinger 2001), and 1,092 birds (1999) (F. A. Amidon. 2000, Williams 2004). Thus the population has declined by a rate equivalent to 74% over 10 years, however there are anecdotal reports that the population has increased since the 1990s(F. Amidon in litt. 2007, 2010, 2011). From 2005 to 2008 the Rota Sabana region was searched for presence/ absence of white-eyes; they were located in 298 ha spread over 6 primary areas on the Sabana tabletop and ridges between 100m and 490m elevation (L. Zarones in litt. 2012). The recovery plan presents a long-term goal of restoring the population to a stable 10,000 individuals (U.S. Fish and Wildlife Service 2007).

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© International Union for Conservation of Nature and Natural Resources

Source: IUCN

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