VU
Woodpecker Finch Geospiza pallida



Taxonomy

Taxonomic note
Geospiza pallida (del Hoyo and Collar 2016) was previously placed in the genus Camarhynchus and listed as C. pallidus following SACC (2005 & updates); Sibley & Monroe (1990, 1993); Stotz et al. (1996).

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.
SACC. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.html#.
SACC. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - A2bc+3bc+4bc; B1ab(v)

Red List history
Year Category Criteria
2016 Vulnerable A2bc+3bc+4bc; B1ab(v)
2015 Vulnerable A2bc+3bc+4bc; B1ab(v)
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
Species attributes

Migratory status not a migrant Forest dependency Low
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 21,600 medium
Number of locations 6 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals unknown not applicable not applicable 0
Population trend Decreasing 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) 30-49 - - -
Decline (10 years/3 generation past and future) 30-49 - - -
Number of subpopulations - - -
Largest subpopulations - - -
Generation length (yrs) 3.8 - - -

Population justification: The global population size has not been quantified, but this species is described as 'uncommon' (Stotz et al. 1996). The population size on Santa Cruz in 2008 (largely confined to higher altitudes) was estimated at c. 12,000 singing males (Dvorak et al. 2012).

Trend justification: The population had been suspected to be stable in the absence of evidence for any declines or substantial threats. However a recent study by Dvorak et al. (2012) used quantitative census data to describe the distribution and abundance of the land birds of Santa Cruz, the second largest island in the Galápagos archipelago. The results revealed that the species had declined significantly between 1997 and 2010, with declines of >65% in the dry zone, >20% in Scalesia forest and >50% in the agricultural zone. Changes in insect abundance or availability could be driving the decline, although other factors such as habitat alteration and introduced species may also be influencing declines (Dvorak et al. 2012). No census data currently exists for the islands of Isabela and Santiago but given the level of habitat destruction and degradation by introduced herbivores on those islands (Henderson and Dawson 2009), similar declines are suspected.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Ecuador Áreas costeras de Fernandina y del occidente de Isabela
Ecuador Isla San Cristóbal
Ecuador Puerto Ayora
Ecuador Tierras altas de Isabela
Ecuador Tierras altas de Santa Cruz
Ecuador Tierras altas de Santiago

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Dry suitable resident
Shrubland Subtropical/Tropical Dry major resident
Altitude 0 - 1700 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Shifting agriculture Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem conversion
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Philornis downsi Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Unspecified species Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Indirect ecosystem effects, Ecosystem degradation
Invasive and other problematic species, genes & diseases Viral/prion-induced diseases - Avipoxvirus Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem conversion

Recommended citation
BirdLife International (2020) Species factsheet: Geospiza pallida. Downloaded from http://www.birdlife.org on 28/02/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 28/02/2020.