EN
Western Bristlebird Dasyornis longirostris



Taxonomy

Taxonomic source(s)
Christidis, L. and Boles, W.E. 2008. Systematics and Taxonomy of Australian Birds. CSIRO Publishing, Collingwood, Australia.
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
- B2ab(ii,iii,v) B1ab(ii,iii,v)+2ab(ii,iii,v); C2a(i); D1

Red List history
Year Category Criteria
2022 Endangered B2ab(ii,iii,v)
2016 Endangered B1ab(iii,v)
2012 Endangered B1ab(iii,v)
2008 Vulnerable C2a(i); D2
2004 Vulnerable
2000 Vulnerable
1996 Endangered
1994 Endangered
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type Land-mass type - Australia
Average mass -
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 9,940 medium
Extent of Occurrence breeding/resident (km2) 240 good
Number of locations 2-15,5 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 500-700, 600 medium estimated 2020
Population trend Decreasing medium inferred -
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 - - -
Percentage in largest subpopulation 1-89 - - -
Generation length (yrs) 3.89 - - -

Population justification:

Monitoring in the Waychinicup-Manypeaks to Two Peoples Bay area in 2019 resulted in the location of a total of 196 pairs (39% of the number estimated in 2001; Comer et al. 2020). The Fitzgerald River National Park subpopulation numbered c.125 pairs in 2005 (Burbidge et al. 2010), but there have been fires since (2007, 2019) in the areas they occupied at that time (McNee et al. 2021). Overall the population is estimated in the range of 500-700 mature individuals with a best estimate of 600 (Comer et al. 2021).

Trend justification: Fires have affected several populations in the last decade and birds appear to have been lost from some sites, e.g. Twertup Track in Fitzgerald River National Park (AH Burbidge unpublished). In 2014 there were estimated to be 363 pairs of Western Bristlebirds in two subpopulations: 203 pairs Two Peoples Bay-Bluff Creek and <150 pairs Fitzgerald River National Park (Department of Parks and Wildlife 2014). Fires in 2015 at Mount Gardner and Mt Manypeaks in 2015 and 2020 will have reduced the number, which also happened in 2005 and 2006, largely as a result of wildfire, when they declined from about 600 pairs to 200325 (Comer & McNee 2001, Tiller et al. 2006). Monitoring in the Waychinicup-Manypeaks to Two Peoples Bay area in 2019 resulted in the location of a total of 196 pairs (39% of the number estimated in 2001; Comer et al. 2020). The Fitzgerald River National Park subpopulation numbered c.125 pairs in 2005 (Burbidge et al. 2010), but there have been fires since (2007, 2019) in the areas they occupied at that time (McNee et al. 2021). Thus, overall, the population is inferred to have declined over the last three generations.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Australia Fitzgerald River
Australia Two Peoples Bay and Mount Manypeaks

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Shrubland Temperate major resident
Altitude 0 - 50 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
Past, Unlikely to Return Majority (50-90%) No decline Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching - Agro-industry grazing, ranching or farming Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) No decline Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion
Climate change & severe weather Droughts Timing Scope Severity Impact
Ongoing Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Climate change & severe weather Temperature extremes Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Felis catus Timing Scope Severity Impact
Ongoing Majority (50-90%) Unknown Unknown
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Phytophthora cinnamomi Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Unspecified species Timing Scope Severity Impact
Ongoing Majority (50-90%) Unknown Unknown
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Vulpes vulpes Timing Scope Severity Impact
Ongoing Majority (50-90%) Unknown Unknown
Stresses
Species mortality
Natural system modifications Fire & fire suppression - Increase in fire frequency/intensity Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Species mortality

Recommended citation
BirdLife International (2022) Species factsheet: Dasyornis longirostris. Downloaded from http://www.birdlife.org on 01/10/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 01/10/2022.