LC
Visayan Rhabdornis Rhabdornis rabori



Taxonomy

Taxonomic note

Rhabdornis inornatus and R. rabori (del Hoyo and Collar 2016) were previously lumped as R. inornatus following Sibley & Monroe (1990, 1993).

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
- - -

Red List history
Year Category Criteria
2022 Least Concern
2016 Vulnerable C2a(i)
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) 24,000 medium
Extent of Occurrence breeding/resident (km2) 3,000
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals not applicable not applicable 0
Population trend Stable 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 2-50 - - -
Percentage in largest subpopulation - - -

Population justification: There is approximately 1,650 km2 of forest cover at suitable elevations for the species (Global Forest Watch [2021], using data from Hansen et al. [2013] and methods disclosed therein). Although no density data exist for R. rabori, a congener (R. mystacilis) has been estimated to occur at densities of 75 birds/km2 (Evans et al. 1991); consequently, it is considered highly unlikely, even accounting for this species' apparent comparative scarcity, that the population falls below 10,000 mature individuals.

Trend justification: The population was previously inferred to be in decline because of forest loss and fragmentation. While this species has undoubtedly lost habitat in its range in the past (especially on Negros, where almost all forest below 1,000 m was cleared by the 20th century), recent remote sensing data (Global Forest Watch [2021], using data from Hansen et al. [2013] and methods disclosed therein) indicate that over the last 10 years, forest loss in this species' range has been c.0.5-1.0%, which is too slow to infer a continuing decline, especially considering its apparent tolerance of small-scale degradation. In the absence of any other identified threats to the species, the population is therefore suspected to be stable.


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

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

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Moist Montane major resident
Altitude 800 - 1800 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Agro-industry farming 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
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, Ecosystem conversion

Recommended citation
BirdLife International (2022) Species factsheet: Rhabdornis rabori. Downloaded from http://www.birdlife.org on 08/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 08/12/2022.