• 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: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
A2abce+4ace	A2abce+4ace	A2abce+4ace; D1

Red List history

Year	Category	Criteria
2019	Critically Endangered	A2abce+4ace
2018	Critically Endangered	A2abce+4ace
2016	Critically Endangered	A2bce+3bce+4bce
2015	Critically Endangered	A2bce+3bce+4bce
2013	Critically Endangered	A2bce+3bce+4bce
2012	Critically Endangered	A2bce+3bce+4bce
2009	Endangered	A2b,c,e; A3b,c,e; A4b,c,e
2008	Near Threatened
2007	Near Threatened
2006	Near Threatened
2004	Near Threatened
2000	Lower Risk/Near Threatened
1994	Lower Risk/Near Threatened
1988	Threatened

Migratory status	full migrant	Forest dependency	does not normally occur in forest
Land-mass type	continent	Average mass	575 g

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	47,300 km2	medium
Extent of Occurrence (non-breeding)	7,200 km2	medium
Number of locations	2-5	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	650-800 mature individuals	good	estimated	2019
Population trend	stable	good	observed	1988-2009
Rate of change over the past 10 years/3 generations (longer of the two periods)	60-80%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	60-80%	-	-	-
Generation length	7.1 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

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.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Argentina	extant	native	yes
Chile	extant	native	yes

Country/Territory	IBA Name
Argentina	Desembocadura del Río Gallegos
Argentina	Estuario del Río Coyle
Argentina	Estuario del Río Santa Cruz
Argentina	La Angostura y Alto Río Chico
Argentina	Meseta del Asador (o Aguila)
Argentina	Meseta Lago Buenos Aires
Argentina	Meseta Lago Strobel
Argentina	Parque Nacional Perito Moreno y Reserva Provincial San Lorenzo

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Marine Neritic	Estuaries	major	non-breeding
Wetlands (inland)	Permanent Freshwater Lakes (over 8ha)	major	breeding
Wetlands (inland)	Permanent Freshwater Lakes (over 8ha)	major	non-breeding
Altitude	500 - 1200 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Indirect ecosystem effects, Ecosystem degradation
Climate change & severe weather	Storms & flooding	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Reduced reproductive success, Species mortality
Energy production & mining	Mining & quarrying	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Energy production & mining	Renewable energy	Timing		Scope		Severity		Impact
		Future		Majority (50-90%)		Rapid Declines		Low Impact: 5
		Stresses Ecosystem degradation
Geological events	Volcanoes	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion, Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Neovison vison	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Oncorhynchus mykiss	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Competition, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Ovis aries	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Larus dominicanus	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Tachyeres patachonicus	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Species mortality
Pollution	Excess energy - Light pollution	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Species disturbance, Ecosystem degradation

---

Recommended citation
BirdLife International (2024) Species factsheet: Hooded Grebe Podiceps gallardoi. Downloaded from https://datazone.birdlife.org/species/factsheet/hooded-grebe-podiceps-gallardoi on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/12/2024.