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

Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: http://www.aerc.eu/DOCS/Bird_taxa_of_the_WP15.xls.
Christidis, L. and Boles, W.E. 2008. Systematics and Taxonomy of Australian Birds. CSIRO Publishing, Collingwood, Australia.
Cramp, S. and Simmons, K.E.L. (eds). 1977-1994. Handbook of the birds of Europe, the Middle East and Africa. The birds of the western Palearctic. Oxford University Press, Oxford.
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.
Turbott, E.G. 1990. Checklist of the Birds of New Zealand. Ornithological Society of New Zealand, Wellington.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2024	Least Concern
2016	Least Concern
2012	Least Concern
2009	Least Concern
2008	Least Concern
2004	Least Concern
2000	Lower Risk/Least Concern
1994	Lower Risk/Least Concern
1988	Lower Risk/Least Concern

Migratory status	full migrant	Forest dependency	low
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	9,270,000 km2	medium
Extent of Occurrence (non-breeding)	20,100,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	1500000 mature individuals	good	estimated	2023
Population trend	stable	-	suspected	-
Generation length	3.16 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The species has a large estimated population size of 1,500,000 mature individuals (Partners in Flight 2023).

Trend justification: Considering its population trend over three generations (c. 10 years), the data presented in Smith et al. (2023) indicate a small increase of c. 6%, albeit with wide confidence intervals. This is broadly consistent with the c. 14% increase recorded by the Breeding Bird Survey (Ziolkowski et al. 2022). Data from Partners in Flight (2023) suggest that the population may have declined by c. 4%, again with wide confidence intervals. Since the 1980s, declines have been noted at some of the salt lakes where this species congregates on passage, probably associated with drought, but evidence for overall population decrease is inconclusive (Colwell and Jehl 2020). Overall, the species' global population trend is suspected to be stable.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Anguilla (to UK)	extant	vagrant
Antarctica	extant	vagrant
Antigua and Barbuda	extant	vagrant			yes
Argentina	extant	native
Australia	extant	vagrant
Bahamas	extant	vagrant
Barbados	extant	native			yes	yes
Belgium	extant	vagrant
Belize	extant	native
Bermuda (to UK)	extant	vagrant
Bolivia	extant	native
Bonaire, Sint Eustatius and Saba (to Netherlands)	extant	vagrant
Brazil	extant	native
Bulgaria	extant	vagrant
Canada	extant	native		yes		yes
Cayman Islands (to UK)	extant	vagrant
Chile	extant	native
Colombia	extant	native
Costa Rica	extant	native			yes
Côte d'Ivoire	extant	vagrant
Curaçao (to Netherlands)	extant	vagrant
Czechia	extant	vagrant
Denmark	extant	vagrant
Dominica	extant	vagrant
Dominican Republic	extant	vagrant
Ecuador	extant	native			yes
El Salvador	extant	native
Estonia	extant	vagrant
Falkland Islands (Malvinas)	extant	vagrant
Finland	extant	vagrant
France	extant	vagrant
Germany	extant	vagrant
Greece	extant	vagrant
Grenada	extant	vagrant
Guadeloupe (to France)	extant	vagrant				yes
Guatemala	extant	native
Haiti	extant	vagrant
Honduras	extant	native
Iceland	extant	vagrant
Ireland	extant	vagrant
Italy	extant	vagrant
Jamaica	extant	native			yes	yes
Japan	extant	vagrant
Latvia	extant	vagrant
Martinique (to France)	extant	vagrant
Mexico	extant	native
Montserrat (to UK)	extant	vagrant
Morocco	extant	vagrant
Namibia	extant	vagrant
Netherlands	extant	vagrant
New Zealand	extant	vagrant
Nicaragua	extant	native
Norway	extant	vagrant
Oman	extant	vagrant				yes
Panama	extant	native
Paraguay	extant	native
Peru	extant	native
Portugal	extant	vagrant
Puerto Rico (to USA)	extant	native			yes	yes
Sint Maarten (to Netherlands)	extant	vagrant
South Africa	extant	vagrant
South Georgia & the South Sandwich Islands	extant	vagrant
Spain	extant	vagrant
Sri Lanka	extant	uncertain
St Kitts and Nevis	extant	vagrant
St Lucia	extant	vagrant
St Pierre and Miquelon (to France)	extant	vagrant				yes
St Vincent and the Grenadines	extant	vagrant
Suriname	extant	native
Sweden	extant	vagrant
Trinidad and Tobago	extant	vagrant
Türkiye	extant	vagrant
Turks and Caicos Islands (to UK)	extant	vagrant
United Kingdom	extant	vagrant
United States Minor Outlying Islands (to USA)	extant	native
Uruguay	extant	native			yes
USA	extant	native		yes
Venezuela	extant	native
Virgin Islands (to UK)	extant	native			yes	yes
Virgin Islands (to USA)	extant	native			yes	yes

Country/Territory	IBA Name
Argentina	Reserva de Uso Múltiple Bañados del Río Dulce y Laguna Mar Chiquita
Ecuador	Humedales de Pacoa
Ecuador	Lagunas de Ecuasal-Salinas
Mexico	Lago de Texcoco
Paraguay	Lagunas Saladas - Riacho Yacaré
USA	Bear River Bay UT02
USA	Farmington Bay UT04
USA	Gilbert Bay/South Arm UT05
USA	Ogden Bay UT03

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Boreal	suitable	breeding
Grassland	Temperate	major	breeding
Marine Coastal/Supratidal	Coastal Brackish/Saline Lagoons/Marine Lakes	suitable	non-breeding
Marine Intertidal	Mud Flats and Salt Flats	suitable	non-breeding
Marine Intertidal	Salt Marshes (Emergent Grasses)	suitable	non-breeding
Wetlands (inland)	Bogs, Marshes, Swamps, Fens, Peatlands	major	breeding
Wetlands (inland)	Permanent Freshwater Lakes (over 8ha)	major	resident
Wetlands (inland)	Permanent Saline, Brackish or Alkaline Lakes	major	non-breeding
Wetlands (inland)	Seasonal/Intermittent Freshwater Lakes (over 8ha)	suitable	resident
Wetlands (inland)	Seasonal/Intermittent Saline, Brackish or Alkaline Lakes and Flats	suitable	non-breeding
Altitude	0 - 2500 m	Occasional altitudinal limits

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%)		No decline		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Ecosystem conversion
Energy production & mining	Mining & quarrying	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion
Natural system modifications	Dams & water management/use - Abstraction of surface water (agricultural use)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation
Natural system modifications	Dams & water management/use - Abstraction of surface water (commercial use)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation
Natural system modifications	Dams & water management/use - Abstraction of surface water (domestic use)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation
Pollution	Agricultural & forestry effluents - Herbicides and pesticides	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation, Species mortality
Pollution	Industrial & military effluents - Seepage from mining	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation

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Recommended citation
BirdLife International (2024) Species factsheet: Wilson's Phalarope Steganopus tricolor. Downloaded from https://datazone.birdlife.org/species/factsheet/wilsons-phalarope-steganopus-tricolor on 22/11/2024.
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 22/11/2024.