EN
Noisy Scrub-bird Atrichornis clamosus



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
- B1ab(iii,v)+2ab(iii,v) B1ab(iii,v)+2ab(iii,v); C2a(i)

Red List history
Year Category Criteria
2022 Endangered B1ab(iii,v)+2ab(iii,v)
2016 Endangered B1ab(i,ii,iii,v)+2ab(i,ii,iii,v)
2012 Endangered B1ab(iii,v)+2ab(iii,v)
2008 Vulnerable D2
2006 Vulnerable
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency Medium
Land mass type Land-mass type - Australia
Average mass -
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 707 medium
Extent of Occurrence breeding/resident (km2) 290
Number of locations 5 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 1100-1600, 1380 good estimated 2020
Population trend Stable good 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) 4.35 - - -

Population justification: Noisy Scrub-bird numbers are currently about 1,380 mature individuals (Burbidge et al. 2018, Comer et al. 2020) based on a ratio of 2.5 individuals for each territorial male (Danks et al. 1996).

Trend justification: The population increased exponentially from about 1983 to 2001 but fires in that year, 2004 and 2015 severely reduced the population on each occasion: on the mainland, there were 569 singing males in 1999, 733 in 2001, 278 in 2005, 379 in 2011, about 520 in 2015 and 415 in 2019 (estimated 1037 mature individuals) (Comer 2002; Comer et al. 2005, 2020; Danks and Comer 2006; Burbidge et al. 2018). In 2019, there were 137 singing males on Bald Island (estimated 342 mature individuals) (Comer et al. 2020). Reasons for a 75% population decline on Mt Gardner since 1994 are not well understood, but the pattern is not correlated with territory size, marginal declines in rainfall or fire impacts (Roberts et al. 2020). Most of this decline has been in the last decade – 70% since 2011 (Comer et al. 2020). Overall, there has been a 28% decline since 2001 but in the last three generations monitoring indicates a change in trajectory with the population increasing by about 10%. There is a high probability, however, that fire will cause population declines in the next three generations based on the increasing frequency of droughts and heat waves in the region (Comer et al. 2021).


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 Two Peoples Bay and Mount Manypeaks

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Temperate major resident
Rocky areas (eg. inland cliffs, mountain peaks) suitable resident
Shrubland Temperate major resident
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands suitable resident
Wetlands (inland) Permanent Rivers/Streams/Creeks (includes waterfalls) suitable resident
Altitude 0 - 500 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 Minority (<50%) Slow, Significant Declines 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 Minority (<50%) Slow, Significant Declines Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion
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 Storms & flooding Timing Scope Severity Impact
Past, Likely to Return Minority (<50%) Slow, Significant Declines Past Impact
Stresses
Ecosystem degradation, Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Felis catus Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Natural system modifications Dams & water management/use - Abstraction of surface water (agricultural use) Timing Scope Severity Impact
Past, Unlikely to Return Minority (<50%) Slow, Significant Declines Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion
Natural system modifications Fire & fire suppression - Increase in fire frequency/intensity Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Species mortality

Recommended citation
BirdLife International (2022) Species factsheet: Atrichornis clamosus. Downloaded from http://www.birdlife.org on 04/10/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 04/10/2022.