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Seychelles Warbler Acrocephalus sechellensis

IUCN Red List Criteria

Near Threatened (criteria nearly met) D2 

IUCN Red List history

Year Category
2015 Near Threatened
2012 Vulnerable
2008 Vulnerable
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
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) 3 medium
Number of locations 5 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 3000 good Estimated 2014
Population trend Increasing good Estimated -
Number of subpopulations 5 - - -
Largest subpopulation - - -
Generation length (yrs) 7.6 - - -
Population justification: In 2007, the population probably numbered over 2,500 birds (G. Rocamora in litt. 2007), roughly equivalent to a minimum of 1,700 mature individuals. Since 2007 the population has increased strongly with c. 2,800 adults in 2014 (N. Shah in litt. 2014) and c. 3,000 adults in August 2015 (D. S. Richardson in litt. 2015).
Trend justification: A population of 58 birds translocated to Denis in May and June 2004 had increased to 75 by August 2005 (Richardson et al. 2006), whilst the number of birds on Cousin increased from 323 in 1997 (Komdeur et al. 1997) to 371 in September 2005 (Richardson et al. 2006). The species is increasing as a result of habitat management and translocations, with the population recently estimated to be c. 3,000 adults (D. S. Richardson in litt. 2015).

Country/Territory distribution

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

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Seychelles Aride Island Special Reserve site factsheet
Seychelles Cousin Island Special Reserve site factsheet
Seychelles Cousine island site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Shrubland Subtropical/Tropical Moist Major resident
Altitude 0 - 0 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Agro-industry farming Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) No decline Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion
Climate change & severe weather Droughts Timing Scope Severity Impact
Past, Likely to Return Majority (50-90%) No decline Past Impact
Stresses
Ecosystem degradation, Reduced reproductive success
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Domestic Cat (Felis catus) Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) No decline Past Impact
Stresses
Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Domestic Cat (Felis catus) Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) Rapid Declines Past Impact
Stresses
Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Domestic Dog (Canis familiaris) Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) Rapid Declines Past Impact
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Goat (Capra hircus) Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) Rapid Declines Past Impact
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Plasmodium relictum Timing Scope Severity Impact
Ongoing Unknown Unknown Unknown
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Plasmodium relictum Timing Scope Severity Impact
Ongoing Whole (>90%) Unknown Unknown
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Unspecified Rattus Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) Rapid Declines Past Impact
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Problematic native species/diseases / Foudia sechellarum Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Problematic native species/diseases / Foudia sechellarum Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Problematic native species/diseases / Unspecified SCINCIDAE Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Problematic native species/diseases / Unspecified species Timing Scope Severity Impact
Ongoing Majority (50-90%) No decline Low Impact: 5
Stresses
Reduced reproductive success

Recommended citation
BirdLife International (2016) Species factsheet: Acrocephalus sechellensis. Downloaded from http://www.birdlife.org on 03/05/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 03/05/2016.

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 (Oustalet, 1877)
Population size 3000 mature individuals
Population trend Increasing
Distribution size (breeding/resident) 3 km2
Country endemic? Yes
Links to further information
- Summary information on this species