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

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2023	Near Threatened	B1b(iii)+2b(iii)
2016	Vulnerable	D2
2012	Vulnerable	D2
2008	Vulnerable	D2
2004	Vulnerable
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Threatened

Migratory status	not a migrant	Forest dependency	medium
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	28 km2	medium
Area of Occupancy (breeding/resident)	28 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	3000 mature individuals	medium	estimated	2006
Population trend	unknown	medium	-	-
Generation length	3.07 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: This species is described as common and widely distributed throughout Nauru (Buden 2008). Buden (2008) estimated the population at 5,000 individuals, roughly equivalent to 3,000 mature individuals.

Trend justification: Habitat loss and degradation in the past may not have majorly affected this species and it can utilise any scrubby vegetation (Buden 2008). However, a number of plausible threats remain and in the absence of an up-to-date evaluation of the population, the population trend is considered unknown.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Nauru	extant	native	yes

Country/Territory	IBA Name
Nauru	Anibare Bay Escarpment

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Plantations	suitable	resident
Artificial/Terrestrial	Rural Gardens	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	suitable	resident
Shrubland	Subtropical/Tropical Moist	suitable	resident
Altitude	0 - 60 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Climate change & severe weather	Storms & flooding	Timing		Scope		Severity		Impact
		Future		Minority (<50%)		Negligible declines		No/Negligible Impact: 2
		Stresses Ecosystem degradation
Energy production & mining	Mining & quarrying	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 - Named species	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Reduced reproductive success
Residential & commercial development	Housing & urban areas	Timing		Scope		Severity		Impact
		Past, Likely to Return		Minority (<50%)		Unknown		Past Impact
		Stresses Ecosystem degradation

---

Recommended citation
BirdLife International (2024) Species factsheet: Nauru Reed-warbler Acrocephalus rehsei. Downloaded from https://datazone.birdlife.org/species/factsheet/nauru-reed-warbler-acrocephalus-rehsei 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.