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 |
continent |
Average mass | 11 g |
Estimate | Data quality | |
---|---|---|
Extent of Occurrence (breeding/resident) | 3,910,000 km2 | medium |
Extent of Occurrence (non-breeding) | 2,370,000 km2 | medium |
Severely fragmented? | no | - |
Estimate | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
Population size | 17000000 mature individuals | poor | estimated | 2019 |
Population trend | decreasing | medium | inferred | 1998-2008 |
Generation length | 2.31 years | - | - | - |
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 | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Canada | extant | native | yes | |||
Mexico | extant | native | yes | yes | ||
USA | extant | native | yes | yes | yes | yes |
Country/Territory | IBA Name |
---|---|
Mexico | Cuatro Ciénegas |
Mexico | El Manantial |
Mexico | Nacimiento Río Sabinas-Sureste de la Sierra de Santa Rosa |
Mexico | Presa el Tulillo |
Mexico | Presa Venustiano Carranza |
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 | ||||||
|
|||||||||
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 | ||||||
|
Recommended citation
BirdLife International (2024) Species factsheet: Brewer's Sparrow Spizella breweri. Downloaded from
https://datazone.birdlife.org/species/factsheet/brewers-sparrow-spizella-breweri on 19/12/2024.
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 19/12/2024.