• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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.

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

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	9,940 km2	medium
Area of Occupancy (breeding/resident)	240 km2	good
Number of locations	2-15,5	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	500-700, 600 mature individuals	medium	estimated	2020
Population trend	decreasing	medium	inferred	1998-2008
Generation length	3.89 years	-	-	-
Number of subpopulations	2	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

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and birds appear to have been lost from some sites, e.g. Twertup Track in Fitzgerald River National Park (AH Burbidge unpublished).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 200–325 (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	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Australia	extant	native	yes

Country/Territory	IBA Name
Australia	Fitzgerald River
Australia	Two Peoples Bay and Mount Manypeaks

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Shrubland	Temperate	major	resident
Altitude	0 - 50 m	Occasional altitudinal limits

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

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Recommended citation
BirdLife International (2024) Species factsheet: Western Bristlebird Dasyornis longirostris. Downloaded from https://datazone.birdlife.org/species/factsheet/western-bristlebird-dasyornis-longirostris 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.