Data Zone
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.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2021 | Near Threatened | B1a+2a |
| 2016 | Near Threatened | D2 |
| 2015 | Near Threatened | D2 |
| 2012 | Vulnerable | D2 |
| 2008 | Vulnerable | D2 |
| 2004 | Vulnerable | |
| 2000 | Vulnerable | |
| 1996 | Vulnerable | |
| 1994 | Vulnerable | |
| 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 (km2) | 1,200 | medium |
| Extent of Occurrence breeding/resident (km2) | 40 | |
| Number of locations | 5 | - |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | 3000 | good | estimated | 2014 |
| Population trend | Increasing | good | estimated | - |
| Decline (3 years/1 generation past) | - | - | - | |
| Decline (5 years/1 generation past) | - | - | - | |
| Decline (10 years/1 generation past) | - | - | - | |
| Decline (10 years/3 generation future) | - | - | - | |
| Decline (10 years/3 generation past and future) | - | - | - | |
| Number of subpopulations | 5 | - | - | - |
| Percentage in largest subpopulation | - | - | - | |
| Generation length (yrs) | 7.5 | - | - | - |
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 2016 (D. S. Richardson in litt. 2016).
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 | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Seychelles | N | Extant | Yes |
| Country/Territory | IBA Name |
|---|---|
| Seychelles | Aride Island Special Reserve |
| Seychelles | Cousin Island Special Reserve |
| Seychelles | Cousine island |
| Seychelles | Denis Island |
| Seychelles | Frégate island |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Subtropical/Tropical Mangrove Vegetation Above High Tide Level | suitable | resident |
| Forest | Subtropical/Tropical Swamp | suitable | resident |
| Shrubland | Subtropical/Tropical Moist | major | resident |
| Altitude | Occasional altitudinal limits |
| 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 | ||||||
|
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| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Acridotheres tristis | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | No decline | Low Impact: 5 | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Plasmodium relictum | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | No decline | Low Impact: 5 | ||||||
|
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| 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 | ||||||
|
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| Invasive and other problematic species, genes & diseases | Problematic native species/diseases - Named species | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | No decline | Low Impact: 5 | ||||||
|
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Recommended citation
BirdLife International (2023) Species factsheet: Acrocephalus sechellensis. Downloaded from
http://www.birdlife.org on 05/02/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 05/02/2023.
