Gran Canaria Blue Chaffinch Fringilla polatzeki


Taxonomic note
Fringilla teydea and F. polatzeki (del Hoyo and Collar 2016) were previously lumped as F. teydea following AERC TAC (2003); Cramp et al. (1977-1994); Sibley and 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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- D D1+2

Red List history
Year Category Criteria
2016 Endangered D
Species attributes

Migratory status not a migrant Forest dependency Medium
Land mass type Average mass 30.29999924 g
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 60 medium
Number of locations 2 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 50-249 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 1 - - -
Largest subpopulations 100 - - -
Generation length (yrs) 5.7 - - -

Population justification: The total population is estimated to be 237-387 individuals, with 207-337 at Inagua (35 km2) and 30-50 at Cumbre (18 km2) (Carrascal 2016, Delgado et al. 2016). As some of the birds recorded by the annual monitoring scheme at Inagua are probably not breeding individuals, it is prudent to use the lower estimate when assessing its extinction risk. This implies a minimum total population of 237 birds in 2016 (207 at Inagua and 30 at Cumbre). These form part of the same subpopulation, as colour-marked birds from Inagua were first found breeding at Cumbre, before captive-reared birds were released there to reinforce the wild population.

Trend justification: The results of the annual monitoring scheme show clearly that the species population is currently increasing, and can best be described as having fluctuated within a fairly narrow range over most of the last twenty years (Carrascal et al. 2016). Although the devastating fire in 2007 caused the population to halve in 2008, it subsequently recovered rapidly, with numbers back up to pre-fire levels by 2011, and around 50% higher again by 2016.

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Spain N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Temperate major resident
Altitude 700 - 1800 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Species mortality
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) Rapid Declines Past Impact
Ecosystem degradation, Inbreeding
Human intrusions & disturbance Timing Scope Severity Impact
Ongoing Minority (<50%) No decline Low Impact: 4
Species disturbance
Invasive and other problematic species, genes & diseases Problematic native species/diseases - Named species - Dendrocopos major Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Reduced reproductive success
Natural system modifications Fire & fire suppression - Increase in fire frequency/intensity Timing Scope Severity Impact
Ongoing Minority (<50%) Very Rapid Declines Medium Impact: 7
Ecosystem degradation

Purpose Primary form used Life stage used Source Scale Level Timing
Pets/display animals, horticulture - - International Non-trivial Recent

Recommended citation
BirdLife International (2018) Species factsheet: Fringilla polatzeki. Downloaded from http://www.birdlife.org on 18/07/2018. Recommended citation for factsheets for more than one species: BirdLife International (2018) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 18/07/2018.