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

Taxonomic note

Passerculus henslowii (del Hoyo and Collar 2016) was previously placed in the genus Ammodramus following AOU (1998 & supplements); Sibley & Monroe (1990, 1993).

 

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2018	Least Concern
2016	Near Threatened	A2bc+3bc+4bc
2012	Near Threatened	A2bc+3bc+4bc
2008	Near Threatened	A2b,c; A3b,c; A4b,c
2004	Near Threatened
2000	Lower Risk/Least Concern
1994	Lower Risk/Near Threatened
1988	Near Threatened

Migratory status	full migrant	Forest dependency	Does not normally occur in forest
Land mass type	Land-mass type - continent	Average mass	12.800000190734863 g

	Estimate	Data quality
Extent of Occurrence breeding/resident (km2)	2,030,000	medium
Extent of Occurrence non-breeding (km2)	1,490,000	medium
Number of locations		-
Fragmentation		-

	Estimate	Data quality	Derivation	Year of estimate
No. of mature individuals	390000	medium	estimated	2016
Population trend	Increasing	poor	estimated	-
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)		-	-	-
Number of subpopulations		-	-	-
Largest subpopulations		-	-	-
Generation length (yrs)	3.9	-	-	-

Population justification: Rosenberg et al. (2016) estimate the population size to be 390,000 mature individuals.

Trend justification: This species has undergone a non-significant annual increase of 2.68% (6.85% increase to 2.35% decrease) between 2005 and 2015 based on data from the Breeding Bird Survey (Sauer et al. 2017). Longer term trends from Christmas Bird Count data show an annual increase of 9.55% between 1966 and 2017 (T. Meehan in litt. 2018).

Country/Territory	Occurrence status	Presence	Resident	Breeding	Non-breeding	Passage
Canada	N	Extant		Yes
USA	N	Extant	Yes

Country/Territory	IBA Name
USA	Bark Camp Barrens Wildlife Management Area
USA	Big Oaks National Wildlife Refuge
USA	Chinook Fish and Wildlife Area and Chinook Mine
USA	Confidential
USA	Confidential
USA	Cypress Creek National Wildlife Refuge
USA	Goose Lake Prairie State Park
USA	Hillenbrand Fish and Wildlife Area
USA	Iroquois County State Conservation Area
USA	Kankakee Sands Project and surrounding natural areas
USA	Lynnville-Squaw Creek Mine Complex
USA	Midewin National Tallgrass Prairie
USA	Mississippi Sandhill Crane National Wildlife Refuge
USA	Mount Zion (Piney Tract)
USA	Prairie Ridge State Natural Area - Jasper and Marion Units
USA	Pratt's Wayne/Phillip State Park Grassland Complex
USA	Pyramid State Park
USA	Universal Mine
USA	Warren Prairie Natural Area

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Pastureland	suitable	non-breeding
Artificial/Terrestrial	Pastureland	suitable	breeding
Grassland	Temperate	major	non-breeding
Grassland	Temperate	major	breeding
Wetlands (inland)	Bogs, Marshes, Swamps, Fens, Peatlands	suitable	non-breeding
Wetlands (inland)	Bogs, Marshes, Swamps, Fens, Peatlands	suitable	breeding
Altitude		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%)		Unknown		Unknown
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Scale Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Unknown		Unknown		Unknown
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Wood & pulp plantations - Agro-industry plantations	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion
Natural system modifications	Fire & fire suppression - Supression in fire frequency/intensity	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Ecosystem degradation
Natural system modifications	Fire & fire suppression - Trend Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation
Pollution	Agricultural & forestry effluents - Type Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Unknown		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, Species mortality
Transportation & service corridors	Utility & service lines	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Species mortality

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Recommended citation
BirdLife International (2019) Species factsheet: Passerculus henslowii. Downloaded from http://www.birdlife.org on 17/02/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/02/2019.