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LC
Vanikoro White-eye Zosterops gibbsi

Justification
Although this species has a very small global range, it does not qualify as Vulnerable under the range size criterion because the population and range size appear to be stable. The population size has been crudely estimated and falls outside the threshold for listing as Vulnerable (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

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

Taxonomic note
Zosterops gibbsi was described as new to science by Dutson (2008).

Distribution and population
This species is known only from the island of Vanikoro, situated 118 km from the main Santa Cruz Islands, Solomon Islands. Based upon reported densities the population probably numbers in the tens of thousands, and while there have been no repeat counts to assess population trends it is assumed to be stable.

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.

Ecology
The species is apparently commonest in lowland coastal forest including secondary growth and in hill forest above 350 m. It was the commonest species above 700 m where 21 individuals were recorded in an area of 1.5 ha. The species gleans arthropods from tree leaves and branches and feeds on small fruits.

Threats
The species appears to be tolerant to some degree of forest degradation and is unlikely to be detrimentally impacted by logging in the near future. The most plausible threat is posed by introduced species, but it apparently coexists with introduced rats Rattus spp. and other invasives are unlikely to colonise the island owing to the current lack of commercial traffic.

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

Further web sources of information
Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Bird, J.

Contributors
Dutson, G.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2014) Species factsheet: Zosterops gibbsi. Downloaded from http://www.birdlife.org on 29/12/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 29/12/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Least Concern
Family Zosteropidae (White-eyes)
Species name author Dutson, 2008
Population size mature individuals
Population trend Increasing
Distribution size (breeding/resident) 200 km2
Country endemic? Yes
Links to further information
- Additional Information on this species