Western Olivaceous Warbler (Iduna opaca) | Details

Western Olivaceous Warbler Iduna opaca

Current view: Data table and detailed info

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	-

Range

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	2,710,000 km²
Extent of Occurrence (non-breeding)	3,830,000 km²
Severely fragmented?	no	-

Population

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	estimated	-
Generation length	4 years	-	-	-

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	Presence	Origin	Breeding visitor	Non-breeding visitor
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

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 (2024) Species factsheet: Western Olivaceous Warbler Iduna opaca. Downloaded from https://datazone.birdlife.org/species/factsheet/western-olivaceous-warbler-iduna-opaca on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/12/2024.