VU
Magellanic Plover Pluvianellus socialis



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. 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#.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - D1

Red List history
Year Category Criteria
2023 Vulnerable D1
2016 Near Threatened C2a(i);D1
2012 Near Threatened C2a(i);D1
2008 Near Threatened C2a(i); D1
2006 Near Threatened
2004 Near Threatened
2000 Lower Risk/Near Threatened
1994 Lower Risk/Near Threatened
1988 Near Threatened
Species attributes

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

Estimate Data quality
Extent of Occurrence (breeding/resident) 204,000 km2 medium
Extent of Occurrence (non-breeding) 893,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 250-999, 330 mature individuals good estimated 2023
Population trend stable - inferred -
Generation length 4.58 years - - -
Number of subpopulations 1 - - -
Percentage of mature individuals in largest subpopulation 100% - - -

Population justification: The species appears to be rare and not abundant. A thorough census of 180 sites carried out in December 2021 over the breeding range detected 264 mature individuals (Imberti and Matus 2023, Imberti et al. 2023). Considering that this census surveyed c.80% of the breeding range, the total population is best estimated at 330 mature individuals. These values were somewhat confirmed by a subsequent count of 65 sites in the non-breeding range during May 2022, which detected 300 individuals, among them 55 juveniles (Imberti and Matus 2023, Imberti et al. 2023).
To account for uncertainty and imperfect detectability, the population is here tentatively placed in the band 250-999 mature individuals, with a best estimate of 330 mature individuals.

Trend justification: The population trend has not been investigated. Anecdotal evidence suggests that the species is genuinely rare (J. Veiga in litt. 2023) and that previous estimates of 1,500-7,000 mature individuals may have been overly optimistic (Imberti and Matus 2023). Visits to a number of known sites over nearly 30 years indicate that the populations there are overall stable, despite some short-term fluctuations in numbers (Imberti and Matus 2023, Imberti et al. 2023). In the absence of evidence for any declines, the population is currently suspected to be stable, albeit at low numbers.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Argentina extant native yes yes yes
Chile extant native yes
Falkland Islands (Malvinas) extant vagrant yes
Uruguay extant vagrant yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Argentina Caldenal del Sudoeste de Buenos Aires
Argentina Meseta Lago Strobel
Argentina Parque Nacional Perito Moreno y Reserva Provincial San Lorenzo
Argentina Meseta Lago Buenos Aires
Argentina Laguna Nimez y costa aledaña del Lago Argentino
Argentina Meseta del Asador (o Aguila)
Argentina Reserva Costa Atlántica de Tierra del Fuego y zonas adyacentes
Chile Estancia San Gregorio
Argentina Estepas arbustivas del Sur de Buenos Aires
Chile Bahía Lomas
Chile Monumento Natural Laguna de los Cisnes
Argentina Estuario del Río Coyle
Argentina Desembocadura del Río Gallegos

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Temperate major breeding
Marine Coastal/Supratidal Coastal Brackish/Saline Lagoons/Marine Lakes major non-breeding
Wetlands (inland) Permanent Freshwater Lakes (over 8ha) major breeding
Wetlands (inland) Permanent Freshwater Marshes/Pools (under 8ha) major breeding
Altitude 0 - 1200 m Occasional altitudinal limits  

Threats & impact
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
Indirect ecosystem effects, Ecosystem degradation, Ecosystem conversion, Reduced reproductive success
Climate change & severe weather Droughts Timing Scope Severity Impact
Ongoing Majority (50-90%) Unknown Unknown
Stresses
Ecosystem degradation, Reduced reproductive success
Energy production & mining Renewable energy Timing Scope Severity Impact
Future Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Species mortality
Human intrusions & disturbance Recreational activities Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Canis familiaris Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Species mortality
Pollution Domestic & urban waste water - Sewage Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation
Pollution Garbage & solid waste Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation
Pollution Industrial & military effluents - Oil spills Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2024) Species factsheet: Pluvianellus socialis. Downloaded from https://datazone.birdlife.org/species/factsheet/magellanic-plover-pluvianellus-socialis on 29/02/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org on 29/02/2024.