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Dot-winged Crake Porzana spiloptera

IUCN Red List Criteria

Critically Endangered  
Endangered  
Vulnerable C2a(i) 

IUCN Red List history

Year Category
2012 Vulnerable
2008 Vulnerable
2006 Vulnerable
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened

Species attributes

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

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 48,500 medium
Number of locations 6-10 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 2500-9999 poor Estimated 2004
Population trend Decreasing poor -
Number of subpopulations 2-100 - - -
Largest subpopulation 251-1000 - - -
Population justification: The population is assumed to fall in the band 2,500-9,999 mature individuals based on the low numbers usually recorded at the relatively small number of known localities with recent records, where it is described as rare to fairly common. This equates to 3,750-14,999 individuals, rounded here to 3,500-15,000 individuals. Verification of this estimate is desirable.
Trend justification: It was formerly locally frequent to abundant in Buenos Aires, but is now rare to fairly common. This may be partly attributable to a paucity of observers, but there seem to have been declines (or perhaps birds are just highly mobile in optimum habitat) at the relatively well-watched sites of Punta Rasa and the río Luján (M. Pearman in litt. 1999). Based on this information, a slow decline is suspected.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Argentina Native Extant Yes      
Brazil Native Extant Yes      
Uruguay Native Extant Yes      

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Argentina Bahía de Samborombón y Punta Rasa site factsheet
Argentina Cuenca del Río Salado site factsheet
Argentina Dorso Occidental Subhúmedo de Santa Fe site factsheet
Argentina El Talar de Belén site factsheet
Argentina Reserva Campos del Tuyú, Estancia El Palenque y Los Ingleses site factsheet
Argentina Reserva de Biosfera Albufera de Mar Chiquita site factsheet
Argentina Reserva de Uso Múltiple Bañados del Río Dulce y Laguna Mar Chiquita site factsheet
Argentina Reserva Natural Otamendi, Reserva Provincial Río Lujan y alrededores site factsheet
Argentina Reserva Natural Punta Lara site factsheet
Argentina Reserva Provincial Laguna Salada Grande site factsheet
Brazil Estuário da Laguna dos Patos site factsheet
Brazil Parque Nacional da Lagoa do Peixe site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Subtropical/Tropical Dry suitable resident
Grassland Subtropical/Tropical Seasonally Wet/Flooded suitable resident
Marine Coastal/Supratidal Coastal Brackish/Saline Lagoons/Marine Lakes suitable resident
Wetlands (inland) Permanent Freshwater Lakes (over 8ha) suitable resident
Wetlands (inland) Permanent Freshwater Marshes/Pools (under 8ha) suitable resident
Altitude 0 - 0 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Agro-industry farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching / Agro-industry grazing, ranching or farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching / Small-holder grazing, ranching or farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
Climate change & severe weather Storms & flooding Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2014) Species factsheet: Porzana spiloptera. Downloaded from http://www.birdlife.org on 30/08/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 30/08/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Vulnerable
Family Rallidae (Rails, Gallinules, Coots)
Species name author Durnford, 1877
Population size 2500-9999 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 48,500 km2
Country endemic? No
Links to further information
- Summary information on this species