Nesasio solomonensis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Strigiformes Strigidae

Scientific Name: Nesasio solomonensis (Hartert, 1901)
Common Name(s):
English Fearful Owl
Spanish Búho de las Salomón
Nesasio solomensis Collar and Andrew (1988) ssp. solomensis (Hartert, 1901) — Collar and Andrew (1988)
Taxonomic Source(s): del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
Identification information: 38 cm. Massive forest owl. Golden eyes framed by prominent creamy eyebrows, otherwise warm brown. Streaked dark underparts and barred dark upperparts. Similar spp. Solomons Islands Hawk-owl Ninox jacquinoti is much smaller (25-30 cm) with plainer facial mask, dark eyes and faintly patterned underparts. Voice Similar to clear human cry, increasing in volume and tone, given as series at 10 second intervals. Hints Rarely seen unless a local guide knows of regular roost or nest-sites.

Assessment Information [top]

Red List Category & Criteria: Vulnerable C2a(i) 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., Hafe, M. & Webb, H.
Facilitator/Compiler(s): Derhé, M., Dutson, G., Mahood, S., O'Brien, A., Stattersfield, A. & North, A.
This enigmatic species is classified as Vulnerable on the basis of a small subpopulations on three island which are declining through habitat degradation. However, its total population size and habitat requirements are poorly known.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Nesasio solomonensis is endemic to Bougainville in Papua New Guinea and Choiseul and Santa Isabel in the Solomon Islands. There are also possible reports from Buka. It is presumed to be a species of low population density as it is rarely seen and no more than one bird has been heard calling from any location. All records are from old-growth forest.

Countries occurrence:
Papua New Guinea; Solomon Islands
Additional data:
Continuing decline in area of occupancy (AOO):Yes
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:45500
Continuing decline in extent of occurrence (EOO):YesExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:11-100Continuing decline in number of locations:Yes
Extreme fluctuations in the number of locations:No
Upper elevation limit (metres):700
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:In a well-studied area at Tirotonga on Isabel, three nests were about 2 km apart (G. Dutson pers. obs. 1998, M. Hafe verbally 1998), which would extrapolate to an approximate total population of c.3,000 pairs, but it appears to be unusually common in this area (G. Dutson pers. obs. 1998). Elsewhere, there have been records only of singles or single pairs. It is plausible that the subpopulations on the three islands each number less than 1,000 mature individuals.

Trend Justification:  Forest loss and degradation are suspected to be causing this species to decline at a moderate rate.
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:2-100Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No
No. of individuals in largest subpopulation:1-89

Habitat and Ecology [top]

Habitat and Ecology:This large owl is the top predator along with Sanford's Fish-eagle Haliaeetus sanfordi and is reported to feed mostly on northern common cuscus Phalanger orientalis (Diamond 1975a, Webb 1992). Cuscus were introduced to these islands in prehistoric times; presumably the owl previously fed on the giant arboreal rats which are now very rare across their range (Flannery 1995). Its distribution may now mirror that of P. orientalis which is heavily hunted for food in some districts (Webb 1992). All records are from old-growth lowland and hill forest, usually in primary forest but also in adjacent secondary forest and forest edge to at least 2,000 m (Gardner 1987, Webb 1992, G. Dutson pers. obs. 1998, Dutson 2011). Three nests on Isabel were on ephiphyte-covered branches of huge fig trees, one was in primary forest, the other two in forest edge close to many gardens (Webb in litt. 1996, G. Dutson pers. obs. 1998)

Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):5.4
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): This species is threatened by large-scale logging and deforestation in the lowlands, which has increased in intensity in recent years, and most of the lowlands of Choiseul and Santa Isabel have been logged or have logging concessions (Katovai et al. 2015). It may also be less common in areas where rural communities over-hunt prey species P. orientalis (Dutson 2011).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
CITES Appendix II. No conservation measures known.

Conservation Actions Proposed
Survey to determine population densities in primary and logged forest, hunted and unhunted areas and at various altitudes. Monitor population trends around Tirotonga. Research diet and breeding success at Tirotonga. Lobby for tighter controls of commercial logging, especially on Choiseul. Discuss possibilities of large-scale community-based conservation areas on all three islands. Promote this species as a figurehead species for community-based conservation and ecotourism initiatives.

Citation: BirdLife International. 2016. Nesasio solomonensis. The IUCN Red List of Threatened Species 2016: e.T22689539A93236256. . Downloaded on 22 April 2018.
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