LC
Isabelline Warbler Iduna opaca



Taxonomy

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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
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
Species attributes

Migratory status full migrant Forest dependency Low
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 2,710,000
Extent of Occurrence non-breeding (km2) 3,830,000
Number of locations -
Fragmentation -
Population and trend
Estimate 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 - - -
Largest subpopulations - - -
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 distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Algeria N Extant Yes
Benin N Extant Yes
Burkina Faso N Extant Yes
Cameroon N Extant Yes
Chad N Extant Yes
Côte d'Ivoire N Extant Yes
Gambia N Extant Yes
Ghana N Extant Yes
Guinea N Extant Yes
Guinea-Bissau N Extant Yes
Liberia N Extant Yes
Libya N Extant Yes
Mali N Extant Yes
Mauritania N Extant Yes
Morocco N Extant Yes
Niger N Extant Yes
Nigeria N Extant Yes
Senegal N Extant Yes
Sierra Leone N Extant Yes
Spain N Extant Yes
Togo N Extant Yes
Tunisia N Extant Yes
Western Sahara N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
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 (2019) Species factsheet: Iduna opaca. Downloaded from http://www.birdlife.org on 16/09/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 16/09/2019.