Data Zone
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#.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| A2abce+4ace | A2abce+4ace | A2abce+4ace; D1 |
| 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 |
Land-mass type - continent |
Average mass | 575 g |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 47,300 | medium |
| Extent of Occurrence non-breeding (km2) | 7,200 | medium |
| Number of locations | 2-5 | - |
| Fragmentation | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | 650-800 | good | estimated | 2019 |
| Population trend | Stable | 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) | - | - | - | |
| Decline (10 years/3 generation past and future) | 60-80 | - | - | - |
| Number of subpopulations | 1 | - | - | - |
| Largest subpopulations | 100 | - | - | - |
| Generation length (yrs) | 7.1 | - | - | - |
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 | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Argentina | N | Extant | Yes | |||
| Chile | N | Extant | Yes |
| 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 |
| 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 | ||||||
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| Climate change & severe weather | Habitat shifting & alteration | Timing | Scope | Severity | Impact | ||||
| Ongoing | Whole (>90%) | Slow, Significant Declines | Medium Impact: 7 | ||||||
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| Climate change & severe weather | Storms & flooding | Timing | Scope | Severity | Impact | ||||
| Ongoing | Whole (>90%) | Slow, Significant Declines | Medium Impact: 7 | ||||||
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| Energy production & mining | Mining & quarrying | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Negligible declines | Low Impact: 5 | ||||||
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| Energy production & mining | Renewable energy | Timing | Scope | Severity | Impact | ||||
| Future | Majority (50-90%) | Rapid Declines | Low Impact: 5 | ||||||
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| Geological events | Volcanoes | Timing | Scope | Severity | Impact | ||||
| Future | Whole (>90%) | Negligible declines | Low Impact: 4 | ||||||
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| 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 | ||||||
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| 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 | ||||||
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| 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 | ||||||
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| 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 | ||||||
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| 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 | ||||||
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| Pollution | Excess energy - Light pollution | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Unknown | Unknown | ||||||
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Recommended citation
BirdLife International (2020) Species factsheet: Podiceps gallardoi. Downloaded from
http://www.birdlife.org on 18/01/2020.
Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 18/01/2020.
