IUCN threat status:

Vulnerable (VU)

Distribution

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Range Description

Rallus antarcticus was rediscovered in 1998, and has been subsequently found at seven localities in Santa Cruz and two in Chubut, Argentina, and two in Magallanes, Chile (Mazar Barnett et al. 1998b, Imberti and Mazar Barnett 1999, Pugnali et al. 2004, Soave et al. 2009, M. Pearman in litt. 2003, J. Mazar Barnett in litt. 2000, 2003). It is fairly common at three sites, with the largest population holding c.35 birds (Mazar Barnett et al. 1998b, Imberti and Mazar Barnett 1999, J. Mazar Barnett in litt. 2000, 2003). Curiously all recent records fall outside the historical range, despite searches at former haunts (J. Mazar Barnett in litt. 2000, 2003). The fact that it has been found in Patagonia in the breeding season, whereas the historical Buenos Aires specimens were taken in autumn/winter may indicate that the species is migratory (Mazar Barnett et al. 1998, Pugnali et al. 2004), although old breeding records from central Chile suggest otherwise (A. Jaramillo in litt. 2012). A tendency to undergo long-distance movements is suggested by a recent record from the Falkland Islands (Malvinas) (Pugnali et al. 2004). It was previously known from a few specimens and fewer confirmed sight records, with none since 1959. In addition historical records exist for Buenos Aires, Río Negro, Santa Cruz and Tierra del Fuego, Argentina, and Valparaiso, Santiago, Colchagua and Llanquihué, Chile. The population is estimated at 2,500 to 9,999 individuals, but recent surveys at the nine locations only added a further 125 individuals to the known total, and there are concerns that the population may actually be below 2,500 (J. Mazar Barnett in litt. 2000, 2003).

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Source: IUCN

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