VU
Laysan Finch Telespiza cantans



Taxonomy

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
- - D2

Red List history
Year Category Criteria
2018 Vulnerable D2
2016 Vulnerable D2
2012 Vulnerable D2
2008 Vulnerable D2
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 4 medium
Number of locations 2 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 1500-7000 medium estimated 2012
Population trend Stable medium suspected -
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 2 - - -
Largest subpopulations - - -
Generation length (yrs) 4.9 - - -

Population justification: The species's population fluctuates widely, probably averaging around 5,000 birds. Carrying capacity for the species has been estimated at 10,000 individuals (M. Morin in litt. 2012), and so its population is best placed in the band 2,500-9,999 individuals. This equates to 1,667-6,666 mature individuals, rounded here to 1,500-7,000 mature individuals.

Trend justification: The current trend is unclear. Large fluctuations were recorded over the period 1968-1990, but this may be partly due to the varying methods and seasons of censuses (Morin and Conant 1994). There has been a dramatic increase in the numbers on Southeast Island, in Pearl and Hermes Reef Atoll, since the successful invasion of golden crown beard Verbesina encelioides, which provides nesting habitat and food. The negative impacts of Verbesina on seabirds dictates that it be removed from the atoll in spite of its benefits to the species (S. Conant in litt. 2003). The population of T. cantans crashed after the first efforts to control Verbesina, but the abundance of Verbesina has since increased (S. Conant in litt. 2007). The overall population is judged to have experienced unquantified fluctuations over the last ten years.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
USA Northwestern Hawaiian Islands

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Subtropical/Tropical Dry major resident
Shrubland Subtropical/Tropical Dry major resident
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Gathering terrestrial plants - Unintentional effects (species is not the target) Timing Scope Severity Impact
Past, Likely to Return Majority (50-90%) Rapid Declines Past Impact
Stresses
Ecosystem degradation
Climate change & severe weather Droughts Timing Scope Severity Impact
Past, Likely to Return Whole (>90%) Causing/Could cause fluctuations Past Impact
Stresses
Ecosystem degradation, Reduced reproductive success, Species mortality
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Rapid Declines Medium Impact: 6
Stresses
Ecosystem degradation, Reduced reproductive success, Species mortality
Climate change & severe weather Storms & flooding Timing Scope Severity Impact
Ongoing Whole (>90%) Causing/Could cause fluctuations Medium Impact: 7
Stresses
Ecosystem degradation, Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Plasmodium relictum Timing Scope Severity Impact
Future Whole (>90%) Rapid Declines Medium Impact: 6
Stresses
Reduced reproductive success, 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
Ecosystem degradation
Invasive and other problematic species, genes & diseases Viral/prion-induced diseases - Avipoxvirus Timing Scope Severity Impact
Future Whole (>90%) Rapid Declines Medium Impact: 6
Stresses
Reduced reproductive success, Species mortality

Recommended citation
BirdLife International (2019) Species factsheet: Telespiza cantans. Downloaded from http://www.birdlife.org on 18/09/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 18/09/2019.