VU
Gizo White-eye Zosterops luteirostris



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
- - D1

Red List history
Year Category Criteria
2022 Vulnerable D1
2016 Endangered C2a(i,ii)
2012 Endangered C2a(i,ii)
2008 Endangered C2a(ii)
2004 Endangered
2002 Endangered
2000 Critically Endangered
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency Medium
Land mass type Average mass -
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 80 medium
Extent of Occurrence breeding/resident (km2) 80
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 250-999, 500-750 medium estimated 2000
Population trend Stable poor 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 1 - - -
Percentage in largest subpopulation 100 - - -

Population justification: The species is described as locally common (Dutson 2011). An approximate population density of 46 birds/km2 was estimated in the 1990s (Buckingham et al. 1995). In 2020, 26 km2 of forest on its tiny range island (35 km2) was estimated to persist (Global Forest Watch [2021], using Hansen et al. [2013] data and methods disclosed therein). Even if 100% of forest was occupied, the population would number only 1,200 birds, equating to c.800 mature individuals. The population size is therefore placed in the band of 250-999 mature individuals, with a best estimates of 500-750 that assumes that most, but not all, of available habitat is occupied.

Trend justification: There are no robust data on the population trend of this species. Habitat trends over the past ten years are inferred to be stable based on the fact that only 2% of forest in its range has been lost over the past decade (Global Forest Watch [2021], using Hansen et al. [2013] data and methods disclosed therein) and the species is at least to some extent tolerant of secondary habitats (although perhaps only where there is adjacent forest). Consequently, while there may be some localised habitat degradation, the population is suspected to be stable, but this requires confirmation.


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

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

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Plantations suitable resident
Forest Subtropical/Tropical Moist Lowland major breeding
Altitude 0 - 200 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Scale Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Shifting agriculture Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation

Recommended citation
BirdLife International (2022) Species factsheet: Zosterops luteirostris. Downloaded from http://www.birdlife.org on 02/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 02/12/2022.