LC
Hose's Broadbill Calyptomena hosii



Taxonomy

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
2023 Least Concern
2016 Near Threatened A2c+3c+4c
2012 Near Threatened A2c+3c+4c
2008 Near Threatened A2c; A3c; A4c
2004 Near Threatened
2000 Lower Risk/Near Threatened
1994 Lower Risk/Least Concern
1988 Near Threatened
Species attributes

Migratory status not a migrant Forest dependency high
Land-mass type shelf island
Average mass -
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 601,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size unknown - - -
Population trend decreasing poor inferred 2010-2023
Rate of change over the past 10 years/3 generations (longer of the two periods) 5-9% - - -
Rate of change over the future 10 years/3 generations (longer of the two periods) 5-15% - - -
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 5-9% - - -
Generation length 4.14 years - - -
Number of subpopulations 1 - - -
Percentage of mature individuals in largest subpopulation 100% - - -

Population justification: The population size of this species has not been quantified. However, forest in its mapped range covers c.140,000 km2, such that its population is likely to be relatively large, even if only a small proportion of this is occupied. In some areas (especially Sabah) the species appears to be rather scarce, however in Sarawak it can be locally very common (Mann 2008, Bruce 2020, eBird 2022).

Trend justification: Although there is little doubt that this species' preference for submontane forest buffers it from the worst of Sundaic forest loss, nonetheless it is likely to be impacted, especially at the lower limits of its elevational range. Vast swathes of habitat do remain however, especially in Kalimantan. In the three generations (12.4 years; Bird et al. 2020) to 2021, forest cover in this species' range was reduced by 5-6% (Global Forest Watch 2022, based on data from Hansen et al. [2013] and methods disclosed therein). This is thought to be broadly representative of population declines, which may in fact be steeper than remote sensing data alone suggest. The population decline is therefore suspected to have been equivalent to 5-9% in the past three generations and, based on slightly accelerated (equivalent to 7-8% losses) deforestation between 2016 and 2021, to 5-15% in the next three generations.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Indonesia extant native yes
Malaysia extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Indonesia Betung Kerihun
Indonesia Kayan Mentarang
Indonesia Ulu Telen
Malaysia Baleh headwaters
Malaysia Danum-Linau
Malaysia Dulit Range
Malaysia Hose-Laga mountains
Malaysia Kelabit Highlands
Malaysia Lanjak Entimau Wildlife Sanctuary
Malaysia Mount Kinabalu
Malaysia Mulu - Buda Protected Area
Malaysia Trus Madi Range
Malaysia Usun Apau plateau

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 600 - 1220 m Occasional altitudinal limits (max) 1680 m

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%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Wood & pulp plantations - Small-holder plantations Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2024) Species factsheet: Hose's Broadbill Calyptomena hosii. Downloaded from https://datazone.birdlife.org/species/factsheet/hoses-broadbill-calyptomena-hosii on 23/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 23/12/2024.