IUCN threat status:

Critically Endangered (CR)


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Range Description

Pterodroma magentae was rediscovered in 1978 in the south-west corner of Chatham Island, New Zealand, 111 years after it was first collected at sea (Crockett 1994). Its prevalence in Moriori middens suggests it was once common and has undergone a massive historical decline (Imber et al. 2005). In 1994, only four breeding pairs were known, although it was suspected that others remained undetected, and that the population was still declining at this time. In 2004, surveys indicated a population of 120 individuals, including 15 breeding pairs (Hilhorst 2000, Brooke 2004, G. Taylor in litt. 2005). Just 16 chicks were known to have fledged from 1987-1988 to 2000 (Taylor 2000), but in 2002, a total of seven chicks were fledged (M. Ogle in litt. 2002). By 2006, there were 35 active burrows, an estimated 25 breeding pairs, and 11 known chicks, taking the total number of chicks fledged since 1987 to 63 (Stephenson 2006b). A total of 17 pairs are believed to have laid in the 2009/2010 breeding season (C. Miskelly in litt. 2008, 2010). Between 2007 and 2011, a total of 59 chicks were successfully moved from the Tuku Nature Reserve in the south of Chatham Island to the nearby Sweetwater Conservation Covenant, where they all successfully fledged (C. Miskelly in litt. 2008, 2010). Inshore waters (1-2 km offshore from the colony) around Otawae Point are thought to be important for non-breeders visiting the colony and during courtship at night (Imber et al. 2005). Its range at sea is known to extend across the entire South Pacific Ocean from the Tasman Sea to South America, based on recent tracking results using geolocators in 2008/2009 and 2010/2011 (G. Taylor in litt. 2012). During the breeding season, birds feed mainly south and south-east of the Chatham Islands; they then disperse widely during the non-breeding season, ranging from Tasman Sea to the west coast of South America (G. Taylor in litt. 2012).


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© International Union for Conservation of Nature and Natural Resources

Source: IUCN


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