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Rodrigues Warbler Acrocephalus rodericanus

IUCN Red List Criteria

Near Threatened (criteria nearly met) D2 

IUCN Red List history

Year Category
2013 Near Threatened
2012 Endangered
2008 Endangered
2006 Endangered
2004 Endangered
2000 Endangered
1996 Critically Endangered
1994 Critically Endangered
1988 Threatened

Species attributes

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

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 21 medium
Number of locations 6-10 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 2000-2700 medium Estimated 2012
Population trend Increasing good -
Number of subpopulations 1 - - -
Largest subpopulation 2000-2700 - - -
Generation length (yrs) 4.4 - - -
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 distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Mauritius Native Extant       Yes

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Mauritius Rodrigues mainland site factsheet

Habitats & altitude

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  

Threats & impact

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 Decline 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 / Black Rat (Rattus rattus) 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 / Brown Rat (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 / Domestic Cat (Felis catus) Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Reduced reproductive success, Species mortality

Utilisation

Purpose Primary form used Life stage used Source Scale Level Timing
Pets Whole Adults and juveniles Wild International Non-trivial Recent

Recommended citation
BirdLife International (2014) Species factsheet: Acrocephalus rodericanus. Downloaded from http://www.birdlife.org on 24/10/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 24/10/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Near Threatened
Family Sylviidae (Old World warblers)
Species name author (Newton, 1865)
Population size 2000-2700 mature individuals
Population trend Increasing
Distribution size (breeding/resident) 21 km2
Country endemic? Yes
Links to further information
- Summary information on this species