is known from a few high altitude Andean lakes in south-west Bolivia
(Oruro in 1903, Potos
í), north Chile
(Tarapacá, Antofagasta, Atacama), and north-west Argentina
(Jujuy, Salta, Catamarca in 1918, Tucumán, San Juan)3
. Large concentrations have been recorded only occasionally, most notably 8,988 in the Vilama and Pululos area of Argentina in October 19956
, and 2,800 birds on Laguna Pelada, Bolivia, in November 19891
. It normally occurs at low densities, with 1-10 nesting pairs at most sites, and up to 70-90 at a few5,6
. The Chilean population is estimated at 620 birds2
, and Bolivia seems to hold a healthy population4
. The global population is likely to be in the range of 10,000-19,999 individuals. There is no definite evidence of a recent decline5
, but local populations are believed to fluctuate greatly between periods of drought and inundation.
No one has provided updates yet.