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

Taxonomic note

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.
Dowsett, R. J.; Forbes-Watson, A. D. 1993. Checklist of birds of the Afrotropical and Malagasy regions. Tauraco Press, Li
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2016	Near Threatened	D2
2013	Near Threatened	D2
2012	Endangered	D
2008	Endangered	D1
2006	Endangered
2004	Endangered
2000	Endangered
1996	Critically Endangered
1994	Critically Endangered
1988	Threatened

Migratory status	not a migrant	Forest dependency	does not normally occur in forest
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	14 km2	medium
Number of locations	6-10	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2000-2700 mature individuals	medium	estimated	2012
Population trend	increasing	good	estimated	1998-2008
Generation length	4.4 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: In 1999, the population was estimated to be no fewer than 150 individuals, and it remained at this level until 2004 at least (A. Cristinacce and C. Jones in litt. 2005). The population has since risen rapidly to number over 3,000 (3,100-3,900) individuals by 2010 (Steward 2010, C. Jones in litt. 2010, V. Tatayah in litt. 2011) and close to 4,000 by 2012 (V. Tatayah in litt. 2012). The population is therefore estimated at 3,000-4,000 individuals, assumed to include c.2,000-2,700 mature individuals. It has been noted that the current methodology for censusing this species (Showler 2002, Steward 2010) was designed for low population densities and could now over-estimate numbers (P. Steward in litt. 2013).

Trend justification: Surveys suggest that the population was stable between 1999 and 2004 (A. Cristinacce and C. Jones in litt. 2005), but has since risen rapidly to number over 3,000 (3,100-3,900) individuals by 2010 (Steward 2010, C. Jones in litt. 2010, V. Tatayah in litt. 2011) and close to 4,000 by 2012 (V. Tatayah in litt. 2012).

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

Country/Territory	IBA Name
Mauritius	Rodrigues mainland

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Introduced vegetation		suitable	resident
Shrubland	Subtropical/Tropical Dry	suitable	resident
Shrubland	Subtropical/Tropical Moist	major	resident
Altitude	200 - 390 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Past, Likely to Return		Minority (<50%)		No decline		Past Impact
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Past, Likely to Return		Minority (<50%)		No decline		Past Impact
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Past, Likely to Return		Minority (<50%)		Slow, Significant Declines		Past Impact
		Stresses Ecosystem degradation, Ecosystem conversion
Climate change & severe weather	Droughts	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Unknown		Past Impact
		Stresses Ecosystem degradation, Reduced reproductive success, Species mortality
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		Majority (50-90%)		Unknown		Past Impact
		Stresses Ecosystem degradation, Reduced reproductive success, Species mortality
Human intrusions & disturbance	Work & other activities	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Species disturbance
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		No decline		Low Impact: 5
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus norvegicus	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		No decline		Low Impact: 5
		Stresses Reduced reproductive success
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

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Recommended citation
BirdLife International (2024) Species factsheet: Rodrigues Warbler Acrocephalus rodericanus. Downloaded from https://datazone.birdlife.org/species/factsheet/rodrigues-warbler-acrocephalus-rodericanus 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.