• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.

Population justification: In 2013, a simultaneous count across all plateaus known to have ever held grebes and visiting virtually every lake with historic records of the species, resulted in a count of 691 adults and 144 chicks in 12 colonies (Casañas et al. 2013). During the summer of 2014/2015, 771 adults, 138 juveniles and 12 colonies were recorded across 18 lakes (Roesler et al. 2015). Surveys during the breeding season in 2015/2016,  2016/17 and 2017/18 counted 753, 749 and 776 adults, respectively (Roesler et al. 2016b, 2017, 2018b). The total population is therefore estimated at 650-800 mature individuals.

Trend justification: The population was estimated the population to number 3,000-5,000 individuals in the mid-1980s (Fjeldsa 1984). Following recent and rapid declines, more recent surveys estimated 1,000-1,200 individuals, roughly equivalent to 660-800 mature individuals, representing a population reduction of approximately 60-80% over three generation lengths. This estimate has been borne out by the breeding survey counts of 691 adults and 144 chicks in 2013 (Casañas et al. 2013), 771 adults and 138 chicks in 2014-15 (Roesler et al. 2015), 753 adults and 187 chicks in 2015-16 (Roesler et al. 2016b) and 749 adults and 130 chicks in 2016-17 (Roesler et al. 2017). By comparing the total counts made across the same 58 lagoons in 1984-5 (2,352 individuals) and 2010-11 (471 individuals), the overall population reduction was estimated at 80% over 26 years (Roesler et al. 2012, Roesler 2016), which is equivalent to a 73% reduction over three generation lengths. Nevertheless, it appears from recent counts that the population is now stable, probably as a result of extensive conservation actions.

Recommended citation
BirdLife International (2021) Species factsheet: Podiceps gallardoi. Downloaded from http://www.birdlife.org on 17/04/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/04/2021.