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

Taxonomic source(s)
Brooks, T. 2000. Extinct species. In: BirdLife International (ed.), Threatened Birds of the World, pp. 701-708. Lynx Edicions and BirdLife International, Barcelona and Cambridge, U.K.
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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2023	Extinct
2016	Extinct
2012	Extinct
2008	Extinct
2004	Extinct
2000	Extinct
1996	Extinct
1994	Extinct
1988	Threatened

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

	Estimate	Data quality
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend		-	-	-
Generation length	4.23 years	-	-	-

Population justification: In 1929, the maximum population was estimated at c. 400 individuals (Llimona et al. 2020). Between 1960 and 1965, its population dropped from c.300 to 80 individuals in the 1960s, but recovered to a high of 232 in 1975 (LaBastille 1984). However, various factors drove the population down to 30 by 1983, and the species was extinct by 1986 (LaBastille 1990).

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Guatemala	extinct	native	yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Wetlands (inland)	Permanent Freshwater Lakes (over 8ha)	major	resident
Altitude	1500 - 1500 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Fishing & harvesting aquatic resources - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Whole (>90%)		Negligible declines		Past Impact
		Stresses Species mortality
Biological resource use	Gathering terrestrial plants - Unintentional effects (species is not the target)	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Majority (50-90%)		Negligible declines		Past Impact
		Stresses Ecosystem degradation
Geological events	Earthquakes/tsunamis	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Whole (>90%)		Rapid Declines		Past Impact
		Stresses Species mortality
Human intrusions & disturbance	Recreational activities	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Whole (>90%)		Slow, Significant Declines		Past Impact
		Stresses Species disturbance
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Micropterus salmoides	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Whole (>90%)		Causing/Could cause fluctuations		Past Impact
		Stresses Competition, Species mortality

---

Recommended citation
BirdLife International (2024) Species factsheet: Atitlan Grebe Podilymbus gigas. Downloaded from https://datazone.birdlife.org/species/factsheet/atitlan-grebe-podilymbus-gigas on 23/11/2024.
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 23/11/2024.