Data Zone
Taxonomic note
Iduna opaca (del Hoyo and Collar 2016) was previously listed as Hippolais opaca.
Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: #http://www.aerc.eu/DOCS/Bird_taxa_of _the_WP15.xls#.
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.
Ottosson, U.; Bensch, S.; Svensson, L.; Waldenström, J. 2005. Differentiation and phylogeny of the olivaceous warbler Hippolais pallida species complex. Journal of Ornithology 146: 127-136.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2016 | Least Concern | |
| 2014 | Least Concern | |
| 2012 | Least Concern | |
| 2009 | Least Concern | |
| 2008 | Least Concern | |
| 2007 | Least Concern | |
| 2004 | Not Recognised | |
| 2000 | Not Recognised | |
| 1994 | Not Recognised | |
| 1988 | Not Recognised |
| Migratory status | full migrant | Forest dependency | low |
| Land mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 2,710,000 | |
| Extent of Occurrence non-breeding (km2) | 3,830,000 | |
| Number of locations | - | |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | unknown | not applicable | not applicable | 0 |
| Population trend | decreasing | 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 | - | - | - | |
| Percentage in largest subpopulation | - | - | - | |
| Generation length (yrs) | 4 | - | - | - |
Population justification: The global population size has not been quantified, but the species is reported to be locally common (BirdLife International 2004). The European population is estimated at 5,200 pairs, which equates to 10,400 mature individuals (BirdLife International 2015). However Europe only forms c.10% of the global range. It is described as 'rather common' within much of its North African range (Svensson and Christie 2013).
Trend justification: The European population is estimated to be decreasing by less than 25% in 12 years (three generations) (BirdLife International 2015).
| Country/Territory | Presence | Origin | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Algeria | extant | native | yes | |||
| Benin | extant | native | yes | |||
| Burkina Faso | extant | native | yes | |||
| Cameroon | extant | native | yes | |||
| Chad | extant | native | yes | |||
| Côte d'Ivoire | extant | native | yes | |||
| Gambia | extant | native | yes | |||
| Ghana | extant | native | yes | |||
| Guinea | extant | native | yes | |||
| Guinea-Bissau | extant | native | yes | |||
| Liberia | extant | native | yes | |||
| Libya | extant | native | yes | |||
| Mali | extant | native | yes | |||
| Mauritania | extant | native | yes | |||
| Morocco | extant | native | yes | |||
| Niger | extant | native | yes | |||
| Nigeria | extant | native | yes | |||
| Senegal | extant | native | yes | |||
| Sierra Leone | extant | native | yes | |||
| Spain | extant | native | yes | |||
| Togo | extant | native | yes | |||
| Tunisia | extant | native | yes | |||
| Western Sahara | extant | native | yes |
| Country/Territory | IBA Name |
|---|
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Terrestrial | Arable Land | suitable | breeding |
| Artificial/Terrestrial | Plantations | suitable | breeding |
| Artificial/Terrestrial | Rural Gardens | suitable | breeding |
| Artificial/Terrestrial | Subtropical/Tropical Heavily Degraded Former Forest | suitable | non-breeding |
| Forest | Temperate | suitable | breeding |
| Shrubland | Mediterranean-type Shrubby Vegetation | suitable | breeding |
| Shrubland | Subtropical/Tropical Dry | suitable | breeding |
| Shrubland | Subtropical/Tropical Dry | suitable | non-breeding |
| Altitude | 0 - 2000 m | Occasional altitudinal limits |
Recommended citation
BirdLife International (2023) Species factsheet: Iduna opaca. Downloaded from
http://datazone.birdlife.org/species/factsheet/isabelline-warbler-iduna-opaca on 07/06/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://datazone.birdlife.org on 07/06/2023.
