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

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: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

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

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	204,000 km2	medium
Extent of Occurrence (non-breeding)	893,000 km2	medium
Severely fragmented?	no	-

	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	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

Country/Territory	IBA Name
Argentina	Caldenal del Sudoeste de Buenos Aires
Argentina	Desembocadura del Río Gallegos
Argentina	Estepas arbustivas del Sur de Buenos Aires
Argentina	Estuario del Río Coyle
Argentina	Laguna Nimez y costa aledaña del Lago Argentino
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	Reserva Costa Atlántica de Tierra del Fuego y zonas adyacentes
Chile	Bahía Lomas
Chile	Estancia San Gregorio
Chile	Monumento Natural Laguna de los Cisnes

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

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

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Recommended citation
BirdLife International (2024) Species factsheet: Magellanic Plover Pluvianellus socialis. Downloaded from https://datazone.birdlife.org/species/factsheet/magellanic-plover-pluvianellus-socialis on 25/11/2024.
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 25/11/2024.