LC
Vanikoro White-eye Zosterops gibbsi



Taxonomy

Taxonomic note

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.
Dutson, G. 2008. A new species of White-eye Zosterops and notes on other birds from Vanikoro, Solomon Islands. Ibis 150: 698-706.
Dutson, G. 2008. A new species of White-eye Zosterops and notes on other birds from Vanikoro, Solomon Islands. Ibis 150: 698-706.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2016 Least Concern
2012 Least Concern
2009 Least Concern
2008 Not Recognised
2004 Not Recognised
2000 Not Recognised
1994 Not Recognised
1988 Not Recognised
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 260 good
Number of locations 1 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals poor suspected 2009
Population trend Increasing poor observed -
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 - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 3.5 - - -

Population justification: The species was common above 700 m on Vanikoro where it was recorded at a density of 25 individuals in 1.5 ha, but it was much less common in the lowlands. Vanikoro has a total area of 173 km2, much of which remains forested. Crude interpretation of this data suggests the population can be cautiously estimated to fall within the band 20,000-49,999 individuals.

Trend justification: The only plausible threat to the species posed by introduced rats Rattus spp. has been evident for decades but the species remains relatively common. There are no repeat counts to assess trends, but congeners on other Melanesian islands occur at comparable densities on rat-free and rat-infested islands so the population of this species is suspected to be stable.


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 Vanikoro

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 0 - 800 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Reduced reproductive success

Recommended citation
BirdLife International (2022) Species factsheet: Zosterops gibbsi. Downloaded from http://www.birdlife.org on 07/10/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 07/10/2022.