CR
Hooded Grebe Podiceps gallardoi



Taxonomy

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. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.
SACC. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.html#.
SACC. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
A2bce+3bce+4bce A2bce+3bce+4bce;B1ab(v);C2a(ii) A2bce+3bce+4bce;B1ab(v);C1+2a(i,ii);D1

Red List history
Year Category Criteria
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
Species attributes

Migratory status full migrant Forest dependency Does not normally occur in forest
Land mass type Land-mass type - continent
Average mass 575 g
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 43,500 medium
Extent of Occurrence non-breeding (km2) 1,600 medium
Number of locations 2-5 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 660-800 poor suspected 2011
Population trend Decreasing good observed -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 81 - - -
Decline (10 years/3 generation past and future) 81 - - -
Number of subpopulations 1 - - -
Largest subpopulations 100 - - -
Generation length (yrs) 7.1 - - -

Population justification: O'Donnell and Fjeldsa (1997) estimated the population to number 3,000-5,000 individuals. The minimum population size, based on simultaneous winter counts during 2010-2011, is 759 (Roesler et al. 2011b). Following recent and rapid declines, and new surveys, the latest estimate is 1,000-1,200 individuals, roughly equivalent to 660-800 mature individuals, borne out by the comprehensive 2013 survey's total of 691 adults and 144 chicks (Casañas et al. 2013) and the 2014-2015 survey total of 771 adults and 138 chicks (Roesler et al. 2015).

Trend justification: Censuses on the wintering grounds indicated that the population may have declined by as much as 40% since the late 1990s. Assuming an exponential rate of decline this equates to an extremely rapid population decline of over 80 % over 21 years (three generations). This trend is also supported by recent surveys of the breeding grounds. During the winter counts of 2010 and 2011 no juvenile Hooded Grebes were observed (Roesler et al. 2011b).


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Argentina N Extant Yes
Chile N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Argentina Confluencia, desembocadura y adyacencias de los ríos Chico y Santa Cruz
Argentina Estuario del Río Coyle
Argentina Estuario del Río Gallegos
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
Argentina Península y Bahía de San Julián
Chile Monumento Natural Laguna de los Cisnes

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

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Livestock farming & ranching 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%) Rapid Declines High Impact: 8
Stresses
Indirect ecosystem effects, Ecosystem degradation
Energy production & mining Mining & quarrying Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
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 Timing Scope Severity Impact
Ongoing Majority (50-90%) Very Rapid Declines High Impact: 8
Stresses
Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Whole (>90%) Rapid Declines High Impact: 8
Stresses
Competition, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases 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 Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Stresses
Species mortality

Recommended citation
BirdLife International (2017) Species factsheet: Podiceps gallardoi. Downloaded from http://www.birdlife.org on 24/11/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 24/11/2017.