IUCN threat status:

Critically Endangered (CR)

Distribution

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Range Description

Zosterops chloronothus is endemic to Mauritius. It declined rapidly from 350 pairs in the mid-1970s, to c.275 pairs by the mid-1980s. Intensive fieldwork during 1990-1993 indicated a further reduction to an estimated 200 pairs (Safford 1997c), and fieldwork between 1998 and 2001 concluded that the global population size lay within the range 93-148 pairs (R. Switzer in litt. 2003, Nichols et al. 2004, Anon 2006) within an area of less than 25 km2 located in the southwest of the Black River Gorges National Park. It is widespread in upland native forest, but largely absent from the whole Macchabé-Brise Fer area and Fouge Range (Safford 1997c). The species's core distribution has contracted since 1975 - it has disappeared from three outlying sites (Tamarin Falls, Jouanis and Monvert) and the core area has decreased by 50% (Nichols et al. 2005). Its status in central Mauritius (Montagne Lagrave and the central plateau relics) remains uncertain (R. Switzer in litt. 2003, Nichols et al. 2004), although one was seen on Mt Lagrave in the breeding season in 2011/2012 (V. Tatayah in litt. 2012). Highest densities are between Montagne Cocotte and Combo Forest with up to 10 pairs/km2 (C. Jones in litt. 2000). Birds exploit isolated habitats over a wide area of the central plateau, including many relict patches of native vegetation (Safford 1997c). Following twenty years of conservation work on Ile aux Aigrettes, 16 white-eyes were released on the predator free island between December 2006 and March 2007 (Anon 2006). A further release of around 20 birds in December 2007 aimed to further the establishment of a small sub-population on Ile aux Aigrettes, and birds have since successfully fledged young there in the 2007/08, 2008/09 and 2010/11 seasons (nine pairs and a total of six fledged young) (Anon. 2011). In March 2011 the population on Ile aux Aigrettes stood at 25 (Anon. 2011), with 26 individuals in March 2012 (V. Tatayah in litt. 2012).

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Source: IUCN

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