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.
Critically Endangered | Endangered | Vulnerable |
---|---|---|
- | - | A2c |
Year | Category | Criteria |
---|---|---|
2022 | Vulnerable | A2c |
2016 | Vulnerable | A2c |
2015 | Vulnerable | A2c |
2013 | Near Threatened | A2c; C2a(ii) |
2012 | Near Threatened | A2c;C2a(ii) |
2010 | Vulnerable | C1 |
2008 | Near Threatened | A2c; A3c; A4c; B2a+b(i,ii,iii,iv,v); C1 |
2004 | Near Threatened | |
2000 | Lower Risk/Least Concern | |
1996 | Vulnerable | |
1994 | Vulnerable | |
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) | 41,800 km2 | medium |
Severely fragmented? | no | - |
Estimate | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
Population size | 2600-14000, 11000 mature individuals | medium | estimated | 2020 |
Population trend | decreasing | medium | inferred | 1981-2010 |
Rate of change over the past 10 years/3 generations (longer of the two periods) | 30-49% | - | - | - |
Generation length | 3.15 years | - | - | - |
Number of subpopulations | 3 | - | - | - |
Population justification: The population of Carpentarian Grasswrens is estimated at 2,600–14,000 individuals based on a density estimate of two mature birds per 2 km2 breeding territory. The number of breeding territories comes from the combined area of 'probable habitat', as defined by a habitat suitability model (H Stoetzel unpublished), within convex hulls measured independently for each subpopulation. However, these estimates are based on limited search effort, particularly in the north of the species' range where the extent of occurrence boundary is uncertain.
Trend justification:
Major fires in 2011 and 2012 reduced the AOO and are thought to have caused the population to decline by >30%–50% within the last ten years. The decline in the area occupied is thought to be reflected in a decline in population. Between 2008 and 2013, the species' extent of occurrence was estimated to have declined by around 33%, and its area of occupancy by around 35%, with the bulk of these declines being attributed to the severe fires in 2011 and 2012 (Harrington & Murphy 2015). Though these fires eliminated grasswrens from large areas which have not yet been recolonised, such widespread fire events have not occurred since. A longer-term trend of increasing fire extent (Russell-Smith 2001) is likely to have been affecting the population since the removal of Aboriginal land management, justifying the species to be retrospectively assessed as Near Threatened in 2000 and 2010.
Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Australia | extant | native | yes |
Country/Territory | IBA Name |
---|---|
Australia | Boodjamulla |
Australia | Buckley River |
Australia | Wollogorang |
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Rocky areas (eg. inland cliffs, mountain peaks) | major | resident | |
Savanna | Dry | major | resident |
Shrubland | Subtropical/Tropical Dry | major | resident |
Altitude | 0 - 500 m | Occasional altitudinal limits |
Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
---|---|---|---|---|---|---|---|---|---|
Climate change & severe weather | Other impacts | Timing | Scope | Severity | Impact | ||||
Future | Majority (50-90%) | Slow, Significant Declines | Low Impact: 4 | ||||||
|
|||||||||
Energy production & mining | Mining & quarrying | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
|||||||||
Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Cenchrus ciliaris | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
|||||||||
Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Felis catus | Timing | Scope | Severity | Impact | ||||
Ongoing | Unknown | Unknown | Unknown | ||||||
|
|||||||||
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 | ||||||
|
Recommended citation
BirdLife International (2024) Species factsheet: Carpentarian Grasswren Amytornis dorotheae. Downloaded from
https://datazone.birdlife.org/species/factsheet/carpentarian-grasswren-amytornis-dorotheae 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.