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

Taxonomic note

Acrocephalus caffer, A. musae and A. longirostris (del Hoyo and Collar 2016) were previously lumped as A. caffer following Sibley and 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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	D1

Red List history

Year	Category	Criteria
2020	Vulnerable	D1
2016	Endangered	B1ab(ii,iii,v);C2a(i)
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	medium
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	420 km2	medium
Area of Occupancy (breeding/resident)	456 km2
Number of locations	19-100	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	250-999 mature individuals	poor	estimated	2018
Population trend	stable	poor	estimated	1998-2008
Generation length	2.8 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The population was estimated to number a few hundred individuals by Monnet et al. (1993). Surveys in 2017-18 recorded a minimum of 181 breeding territories and estimated at least 372 adults, noting that they were unable to access all valleys where the species was previously recorded (Lazzari et al. 2018, SOP Manu 2019). The population size is placed in the band 250-999 mature individuals.

Trend justification: Surveys have been carried out in 39 valleys during 1986-91 (Monnet et al. 1993) and during 2017-18 (Lazzari et al. 2018, SOP-Manu 2019). The 1986-91 surveys recorded the species in 12 valleys and estimated the population to number a few hundred individuals (Monnet et al. 1993). The 2017-18 surveys detected the species in 19 valleys, including several valleys where the species was previously reported to be absent, and estimated a population size of at least 372 adults (Lazzari et al. 2018, SOP-Manu 2019). Due to access limitations, the 2017-18 survey did not cover one of the valleys previously surveyed, but all resurveyed valleys that were previously occupied were still occupied (SOP-Manu 2019). The 2017-2018 survey appeared to show a territorial expansion, but differences in survey methodologies, including the use of playback in the later survey, mean that the trend is uncertain and is precautionarily hypothesised to be stable (SOP-Manu 2019).

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

Country/Territory	IBA Name
French Polynesia	Vallée de la Papenoo

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Plantations	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Shrubland	Subtropical/Tropical Moist	major	resident
Altitude	50 - 700 m	Occasional altitudinal limits	(max) 1700 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Gathering terrestrial plants - Unintentional effects (species is not the target)	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		No decline		Low Impact: 5
		Stresses Species disturbance, Ecosystem degradation, Reduced reproductive success
Human intrusions & disturbance	Recreational activities	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Species disturbance, Ecosystem degradation, Ecosystem conversion
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Acridotheres tristis	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		No decline		Medium Impact: 6
		Stresses Competition
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Miconia calvescens	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		No decline		Low Impact: 5
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Pycnonotus cafer	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Competition
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus rattus	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		No decline		Low Impact: 5
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Wasmannia auropunctata	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Species disturbance, Ecosystem degradation, Reduced reproductive success
Transportation & service corridors	Roads & railroads	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Species disturbance, Ecosystem degradation, Ecosystem conversion

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