Data Zone
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.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2021 | Least Concern | |
| 2018 | Least Concern | |
| 2016 | Least Concern | |
| 2012 | Least Concern | |
| 2009 | Least Concern | |
| 2008 | Least Concern | |
| 2007 | Near Threatened | |
| 2004 | Not Recognised | |
| 2000 | Not Recognised | |
| 1994 | Not Recognised | |
| 1988 | Not Recognised |
| Migratory status | full migrant | Forest dependency | Does not normally occur in forest |
| Land mass type |
Land-mass type - continent |
Average mass | 11 g |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 3,910,000 | medium |
| Extent of Occurrence non-breeding (km2) | 2,370,000 | medium |
| Number of locations | - | |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | 17000000 | poor | estimated | 2019 |
| Population trend | Decreasing | medium | inferred | - |
| 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 | - | - | - | |
| Percentage in largest subpopulation | - | - | - |
Population justification: The global population is estimated to number 17 million mature individuals (Partners in Flight 2019).
Trend justification: The species has been undergoing a moderate decline at an average rate of 1.1% per year between 1970 and 2017 (Partners in Flight 2019). Short-term trends suggest that the population has declined by 21% over the past ten years (Pardieck et al. 2018). However, population size estimates fluctuate between years and the trend estimate is biased towards end point values; therefore it is here assumed that the overall rate of decline does not approach the threshold for Vulnerable.
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Canada | N | Extant | Yes | |||
| Mexico | N | Extant | Yes | Yes | ||
| USA | N | Extant | Yes | Yes | Yes | Yes |
| Country/Territory | IBA Name |
|---|---|
| Mexico | Nacimiento Río Sabinas-Sureste de la Sierra de Santa Rosa |
| Mexico | Presa Venustiano Carranza |
| Mexico | Presa el Tulillo |
| Mexico | Cuatro Ciénegas |
| Mexico | El Manantial |
| Mexico | Janos - Nuevo Casas Grandes |
| Mexico | Pradera de Tokio |
| Canada | Kilpoola Lake Area |
| Canada | Chopaka Customs |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Grassland | Temperate | major | non-breeding |
| Shrubland | Temperate | major | breeding |
| Altitude | 0 - 2000 m | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Bromus tectorum | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
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| Natural system modifications | Fire & fire suppression - Increase in fire frequency/intensity | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
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Recommended citation
BirdLife International (2022) Species factsheet: Spizella breweri. Downloaded from
http://www.birdlife.org on 26/06/2022.
Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 26/06/2022.
