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 |
|---|---|---|
| A3bce+4abce; C1+2a(ii) | A3bce+4abce; C1+2a(i,ii); D | A2abce+3bce+4abce; B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v); C |
| Year | Category | Criteria |
|---|---|---|
| 2016 | Critically Endangered | A3bce+4abce; C1+2a(ii) |
| 2012 | Critically Endangered | C2a(ii) |
| 2009 | Critically Endangered | C2a(ii) |
| 2008 | Critically Endangered | |
| 2004 | Critically Endangered | |
| 2000 | Endangered | |
| 1996 | Critically Endangered | |
| 1994 | Critically Endangered | |
| 1988 | Threatened |
| Migratory status | not a migrant | Forest dependency | High |
| Land mass type | Average mass | 8 g |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 100 | medium |
| Extent of Occurrence breeding/resident (km2) | 32 | medium |
| Number of locations | 8 | - |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | 191-327 | good | estimated | 2012 |
| Population trend | Decreasing | 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) | 100 | - | - | - |
| Decline (10 years/3 generation past and future) | 100 | - | - | - |
| Number of subpopulations | 2 | - | - | - |
| Percentage in largest subpopulation | 1-89 | - | - | - |
| Generation length (yrs) | 3.5 | - | - | - |
Population justification: The population estimate of 191-327 mature individuals is derived from 160-296 mature individuals on the mainland (from Nichols et al. [2004] and Ormsby et al. [2012]) and a population of 46 individuals (roughly equivalent to 31 mature individuals) on Iles aux Aigrettes (Ferrière et al. 2015).
Trend justification: Surveys have revealed that the population size declined from an estimated 346 pairs in 1975 to c.200 pairs in 1993 and 93-148 pairs in 2001 (Nichols et al. 2004), and just 7-17% of nesting attempts successfully fledged one chick between 1998 and 2001, hence current rapid declines are likely to continue into the future. Maggs (2016) conducted a population viability analysis of this species and concluded that the population would go extinct within 50 years; this may even be the case within 3 generations as Maggs et al. (2015) extrapolated from current declines to project 14% declines per annum.
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Mauritius | N | Extant | Yes |
| Country/Territory | IBA Name |
|---|---|
| Mauritius | Black River Gorges National Park and surrounding areas |
| Mauritius | Macchabé - Brise Fer forest |
| Mauritius | Relict Forests of the Central Plateau |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Terrestrial | Plantations | major | non-breeding |
| Forest | Subtropical/Tropical Moist Montane | major | resident |
| Altitude | 200 - 600 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, Unlikely to Return | Majority (50-90%) | Negligible declines | Past Impact | ||||||
|
|||||||||
| Biological resource use | Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] | Timing | Scope | Severity | Impact | ||||
| Past, Unlikely to Return | Majority (50-90%) | Negligible declines | Past Impact | ||||||
|
|||||||||
| Climate change & severe weather | Habitat shifting & alteration | Timing | Scope | Severity | Impact | ||||
| Future | Whole (>90%) | Unknown | Unknown | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Ligustrum robustum | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Psidium cattleianum | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Pycnonotus jocosus | Timing | Scope | Severity | Impact | ||||
| Unknown | Unknown | Unknown | Unknown | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Rattus norvegicus | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Rattus rattus | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Problematic native species/diseases - Hypsipetes olivaceus | Timing | Scope | Severity | Impact | ||||
| Unknown | Unknown | Unknown | Unknown | ||||||
|
|||||||||
Recommended citation
BirdLife International (2023) Species factsheet: Zosterops chloronothos. Downloaded from
http://www.birdlife.org on 26/03/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 26/03/2023.
