Taxonomic note
Acrocephalus luscinius, A. hiwae, A. yamashinae, A. astrolabii and A. nijoi (del Hoyo and Collar 2016) were previously lumped as A. luscinius following Sibley & Monroe (1990, 1993).
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.
Critically Endangered | Endangered | Vulnerable |
---|---|---|
- | - | - |
Year | Category | Criteria |
---|---|---|
2023 | Extinct | |
2016 | Extinct | |
2012 | Not Recognised | |
2008 | Not Recognised | |
2004 | Not Recognised | |
2000 | Not Recognised | |
1994 | Not Recognised | |
1988 | Not Recognised |
Migratory status | not a migrant | Forest dependency | low |
Land-mass type | Average mass | 28 g |
Estimate | Data quality | |
---|---|---|
Severely fragmented? | no | - |
Estimate | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
Population size | unknown | - | - | - |
Population trend | medium | - | 2009-2026 | |
Generation length | 4.49 years | - | - | - |
Population justification: The last confirmed sighting of this species was made in 1969, having been said to still be ‘fairly common’ in parts of the Agana Swamp in 1967 or 1968 before rapidly disappearing from this, the species’ last site (Reichel et al. 1992). As with A. yamashinae the species was primarily restricted to wetland habitats, which suffered considerable disturbance (Reichel et al. 1992). It is likely that the introduced Brown Tree Snake Boiga irregularis delivered the final blow to the species following significant habitat loss from drainage and fires, potential impacts from pesticides and impacts of a variety of additional introduced species (Reichel et al. 1992, Kennerley and Pearson 2010).
Trend justification:
Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Guam (to USA) | extinct | native | yes |
Country/Territory | IBA Name |
---|
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Forest | Subtropical/Tropical Moist Lowland | suitable | resident |
Shrubland | Subtropical/Tropical Moist | suitable | resident |
Wetlands (inland) | Bogs, Marshes, Swamps, Fens, Peatlands | suitable | resident |
Wetlands (inland) | Permanent Freshwater Lakes (over 8ha) | suitable | resident |
Wetlands (inland) | Permanent Freshwater Marshes/Pools (under 8ha) | suitable | resident |
Altitude | 0 - 500 m | Occasional altitudinal limits |
Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
---|---|---|---|---|---|---|---|---|---|
Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Boiga irregularis | Timing | Scope | Severity | Impact | ||||
Past, Unlikely to Return | Whole (>90%) | Very Rapid Declines | Past Impact | ||||||
|
|||||||||
Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Capra hircus | Timing | Scope | Severity | Impact | ||||
Past, Unlikely to Return | Majority (50-90%) | Slow, Significant Declines | Past Impact | ||||||
|
|||||||||
Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Coccinia grandis | Timing | Scope | Severity | Impact | ||||
Past, Unlikely to Return | Majority (50-90%) | Slow, Significant Declines | Past Impact | ||||||
|
|||||||||
Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Felis catus | Timing | Scope | Severity | Impact | ||||
Past, Unlikely to Return | Minority (<50%) | Rapid Declines | Past Impact | ||||||
|
|||||||||
Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Named species | Timing | Scope | Severity | Impact | ||||
Past, Unlikely to Return | Majority (50-90%) | Rapid Declines | Past Impact | ||||||
|
|||||||||
Invasive and other problematic species, genes & diseases | Problematic native species/diseases - Varanus indicus | Timing | Scope | Severity | Impact | ||||
Past, Unlikely to Return | Minority (<50%) | Negligible declines | Past Impact | ||||||
|
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Natural system modifications | Dams & water management/use - Abstraction of surface water (unknown use) | Timing | Scope | Severity | Impact | ||||
Past, Unlikely to Return | Majority (50-90%) | Slow, Significant Declines | Past Impact | ||||||
|
|||||||||
Natural system modifications | Fire & fire suppression - Increase in fire frequency/intensity | Timing | Scope | Severity | Impact | ||||
Past, Unlikely to Return | Minority (<50%) | Slow, Significant Declines | Past Impact | ||||||
|
|||||||||
Pollution | Agricultural & forestry effluents - Herbicides and pesticides | Timing | Scope | Severity | Impact | ||||
Past, Unlikely to Return | Majority (50-90%) | Slow, Significant Declines | Past Impact | ||||||
|
Purpose | Scale |
---|---|
Pets/display animals, horticulture | international |
Recommended citation
BirdLife International (2024) Species factsheet: Guam Reed-warbler Acrocephalus luscinius. Downloaded from
https://datazone.birdlife.org/species/factsheet/guam-reed-warbler-acrocephalus-luscinius on 22/11/2024.
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 22/11/2024.