Justification This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is very large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Family/Sub-family Anatidae

Species name author (Merrem, 1841)

Taxonomic source(s) SACC (2005 + updates), Sibley and Monroe (1990, 1993), Stotz et al. (1996)

Population estimate

Population trend

Range estimate (breeding/resident)

Country endemic?

100,000

unset

1,950,000 km²

No

Range & population This species breeds in central Chile (Santiago to Valdivia), western Paraguay (Boquerón and Presidente Hayes) and northern Argentina (south to Buenos Aires) (del Hoyo et al. 1992, Madge and Burn 1988, Hayes 1995). It is partially migratory with southern populations moving north to Bolivia, south Brazil and Uruguay in the austral winter; northern breeding populations are largely sedentary (del Hoyo et al. 1992, Madge and Burn 1988).

Important Bird Areas Click here to view map showing IBAs where species is recorded and triggers any of the IBA criteria.

References Madge and Burn 1988, del Hoyo et al. 1992, Hayes 1995, Kear 2005.

Text account compilers Stuart Butchart (BirdLife International), Jonathan Ekstrom (BirdLife International), Matt Harding (BirdLife International)

IUCN Red List evaluators Jeremy Bird (BirdLife International), Stuart Butchart (BirdLife International)

Recommended citation BirdLife International (2009) Species factsheet: Heteronetta atricapilla. Downloaded from http://www.birdlife.org on 10/2/2010

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

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