Zosterops splendidus 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Zosteropidae

Scientific Name: Zosterops splendidus Hartert, 1929
Common Name(s):
English Ranongga White-eye, Ganongga White-eye, Splendid White-eye
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.
Identification information: 12 cm. Small, bright, warbler-like bird. Broad silvery eye-ring contrasts with dark olive head and bright yellow underparts. Upperparts dark olive with greenish wash extending over breast-sides and fainter along flanks. Bill black and legs orange-yellow. Similar spp. Female Olive-backed Sunbird Nectarinia jugularis has long decurved bill and no eye-ring. Voice Short, simple melodic song and loud cheu contact calls. Hints Best located when singing in early morning.

Assessment Information [top]

Red List Category & Criteria: Vulnerable C2a(ii) ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Dutson, G. & Filardi, C.
Facilitator/Compiler(s): Derhé, M., Dutson, G., Ekstrom, J., Mahood, S. & Stattersfield, A.
This species is considered to be Vulnerable on the basis of its small, declining population. However, the estimations of population size and structure are based on very poor data, and evidence of a higher population may lead to reclassifying as Near Threatened.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Zosterops splendidus is endemic to Ranongga (= Ganongga) in the Solomon Islands. It appeared to be fairly common in most suitable habitat on three day-trips to this island in the 1990s (Gibbs 1996, G. Dutson pers. obs. 1998, Hornbuckle 1999)

Countries occurrence:
Solomon Islands
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:180
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):No
Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:In 1998, 17 birds were recorded in six hours (G. Dutson pers. obs. 1998). During a two-day netting session (targeting white-eyes) in forest edge in 2004, three birds were captured across eight mist-nets; and during a two-day netting session in secondary growth adjacent to gardens in 2005, six birds were captured across six mist-nets (C. Filardi in litt. 2012). This can be extrapolated to a total population of a few thousand birds if the habitats visited were representative of the overall island, and the population is estimated here to number 2,500-9,999 mature individuals.

Trend Justification:  There are no data on population trends; however, it is suspected to be in decline, owing to forest loss and degradation.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:2500-9999Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:No
No. of subpopulations:1Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:Yes
No. of individuals in largest subpopulation:100

Habitat and Ecology [top]

Habitat and Ecology:It appears to be common in forest and forest edge, but also old-growth forest and regrowth and thickets with scattered old trees (Gibbs 1996, G. Dutson pers. obs. 1998, Dutson 2011). As with the allopatric Ghizo White-eye Z. luteirostris, it may be able to tolerate a wide range of degraded natural habitats. However, observations in 1998 suggested it may not survive in cleared and scrubby habitats far away from forest or without remnant large trees (G. Dutson pers. obs. 1998). It sometimes feeds in flowers of coconuts (Dutson 2011).

Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):3.5
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Forest is largely restricted to steep slopes and rocky, hilly areas on Ranongga and is slowly being cleared for gardens. Gardens are used to grow food for the nearby urban market of Ghizo as well as for Ranongga villages. However, following the tsunami in 2007, the island has been raised by c.2 m, providing suitable areas for gardening that were previously underwater (C. Filardi in litt. 2012). Much of the remaining forest is on terrain unsuitable for gardening, although trees are likely to be felled for local timber demand (G. Dutson pers. obs. 1998).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
There are some community-based conservation projects on Ranongga.

Conservation Actions Proposed
Assess rates and causes of forest clearance. Support sustainable forest-use programmes. Publicise this species as endemic to Ranongga.

Citation: BirdLife International. 2016. Zosterops splendidus. The IUCN Red List of Threatened Species 2016: e.T22714180A94405043. . Downloaded on 22 April 2018.
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