Dartford Warbler Curruca undata


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#.
Cramp, S. and Simmons, K.E.L. (eds). 1977-1994. Handbook of the birds of Europe, the Middle East and Africa. The birds of the western Palearctic. Oxford University Press, Oxford.
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.

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

Red List history
Year Category Criteria
2016 Near Threatened A2b+3b+4b
2012 Near Threatened A2b+3b+4b
2008 Near Threatened A2b; A3b; A4b
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

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) 3,110,000 medium
Extent of Occurrence non-breeding (km2) 4,180,000 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 1200000-2999999 medium estimated 2015
Population trend Decreasing medium 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) 20-29 - - -
Decline (10 years/3 generation past and future) 20-29 - - -
Number of subpopulations - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 4.1 - - -

Population justification: In Europe (which covers c.85% of the breeding range), the breeding population is estimated to be 629,000-1,454,000 breeding pairs, based on 491,500-875,000 pairs in Spain, a new estimate of 25,000-50,000 pairs in France (Issa and Muller 2015), 100,000-500,000 pairs in Portugal, 10,000-30,000 pairs in Italy, c.20-30 pairs in Andorra and 2,900-3,600 pairs in the United Kingdom (BirdLife International 2015). This equates to approximately 1,255,000-2,910,000 mature individuals and 1,880,000-4,365,000 individuals.

Trend justification: Data from the Spanish common bird monitoring scheme (SACRE) suggest that the species may have declined by an average of 4.6% (95% CI: 6.2-3.1) per year during 1998-2011 (V. Escandell in litt. 2012), with declines occurring in all regions (and hence not simply attributable to a northwards shift in the species's range, as predicted under climate change scenarios). The European Red List of Birds estimated the population to be decreasing at a rate approaching 30% in 12.3 years or three generations (BirdLife International 2015). The population trend for the species produced by the Pan-European Common Bird Monitoring Scheme suggests that it declined by 32% over the period 1980-2012 and by 24% over the period 2003-2012 (EBCC 2016). Whilst populations in Portugal and the United Kingdom are increasing, declines have been reported for both France and Italy. The overall population trend is estimated to be decreasing at a rate of 20-29% over three generations.

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Algeria N Extant Yes
Andorra N Extant Yes
Belgium V Extant Yes
Croatia V Extant Yes
Czechia V Extant Yes
France N Extant Yes
Germany V Extant Yes
Gibraltar (to UK) N Extant Yes
Greece V Extant Yes
Ireland V Extant Yes
Italy N Extant Yes
Libya V Extant Yes
Malta N Extant Yes
Montenegro V Extant
Morocco N Extant Yes
Netherlands V Extant Yes
Portugal N Extant Yes
Serbia V Extant
Spain N Extant Yes
Sweden V Extant Yes
Switzerland V Extant Yes
Tunisia N Extant Yes
Turkey V Extant Yes
United Kingdom N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Portugal Ria de Aveiro
Portugal Murta dam
Portugal Malcata mountains
Spain North and east coasts of Minorca and island of Aire
France Réserve Naturelle du courant d'Huchet
France Iles Chausey
France Baie du Mont Saint Michel et Ile des Landes
France Marais de la Baie d'Audierne
France Etangs de Leucate et Lapalme
France Gorges de la Vis et cirque de Navacelles
France Etangs Montpellierains
France Cordon lagunaire de Sète à Agde
France Etangs de Vendres, Pissevache et Lespignan
France Gorges du Rieutord-Fage-Cagnasses
France Petite Camargue fluvio-lacustre
France Crau
France Salins d'Hyères et de Pesquiers
France Vallée de la Loire : gorges de la Loire
France Champ de Tir du Poteau
France Estuaire de la Gironde : marais du Blayais
France Falaise du Bessin
France Baie des Veys et Marais du Cotentin
France Baies de Morlaix et de Carantec
France Ile d'Ouessant
France Brenne centrale
France Brenne: Forêt de la Petite-Brenne
France Brenne: Forêt de Lancosme
France Golfe de Porto, presqu'île de Scandola et golfe de Galeria
France Vallée du Régino
France Etang d'Urbino et zones humides périphériques
France Iles Finocchiarola et côte de Tamarone à Centuri
France Vallée du Verghello
France Massifs de Fontainebleau et zones humides adjacentes
France Montagne de la Clape
France Etangs Narbonnais
France Hautes Corbières
France Basses Corbières
France Massif des Albères
France Massif du Canigou-Carança
France Gorges du Gardon
France Hautes garrigues du Montpellierais
France Minervois
France Etangs de Canet et de Villeneuve-de-la-Raho et embouchure du Tech
France Montagnes de Marcou, de l'Espinouse et du Caroux
France Gorges de la Dourbie et causses avoisinants
France Camargue
France Chaîne des Alpilles
France Montagne Sainte-Victoire
France Iles Marseillaises: Maire, Jarron, Jarre, Riou, Calseraigne, Congloue et Pomègues
France Massif du Petit Lubéron
France Plateau de Valensole
France Plaine des Maures
France Préalpes de Grasse
France Le Pinail, Forêt de Moulière et bois du Défens
France Marais de Brière
France Marais poitevin et baie de l'Aiguillon
United Kingdom Avon Valley
United Kingdom Chesil Beach and the Fleet
United Kingdom Dorset Heaths and Forests
United Kingdom East Devon Heaths
United Kingdom Poole Harbour
United Kingdom Thames Basin Heaths
United Kingdom New Forest
United Kingdom Wealden Heaths
United Kingdom Ashdown Forest
United Kingdom Exmoor Coast and Heaths
United Kingdom Haldon Forest
Italy Eolie islands
Italy Cuglieri coast
Italy Cape Caccia and Conte port
Italy Gargano promontory
Italy Tuscan Archipelago
Italy Mount Beigua
Italy Circeo National Park
Italy Coast between Marina di Camerota and Policastro Bussentino
Italy Egadi islands
Italy Cape San Marco
Italy Alpi Apuane
Italy Arezzo heathlands
Italy Argentario
Italy Farma valley
Italy Uccellina mountains, Trappola marshes and Ombrone mouth
Italy Orbetello lagoon and Burano lake
Italy Furlo gorge and Mount Catria
Andorra Pirineo de Andorra
Italy Sinis and Oristano wetlands
Portugal Serra de Penha Garcia e Campina de Toulões
Portugal Serra de Monchique
Portugal Luzianes
France Arjuzanx
France Rade de Lorient
France Etang de Biguglia
France Anse de Fouras, baie d'Yves et marais de Rochefort
France Bonne Anse
France Cap Sizun
France Cap Frehel
France Forêt d'Orléans: massifs d'Ingrannes et de Lorris
France Iles Cerbicale
France Forêts domaniales de Corse
France Vallée d'Asco
France Vallée de la Restonica
France Iles Sanguinaires
France Parc National des Cévennes
France Gorges du Tarn et de la Jonte
France Iles d'Hyères
France Plateau de l'Arbois, garrigues de Lancon et chaîne des Côtes
France Region de Pressac, étang de Combourg
France Marais et forêt d'Olonne
France Forêt du Gavre
France Basse Ardêche
Italy Peloritani mountains
Italy Finalese
Italy Asinara island, Piana island and Stintino peninsula
Italy Madonie
Spain La Cabrera mountain range
Spain Peña Labra and Cordel mountain ranges
Spain Fausilla mountains
Spain Rosarito and Navalcán reservoirs-La Iglesuela (Tietar valley)
Spain El Rebollar

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Plantations suitable resident
Grassland Subtropical/Tropical Dry suitable non-breeding
Marine Intertidal Salt Marshes (Emergent Grasses) suitable non-breeding
Shrubland Mediterranean-type Shrubby Vegetation major resident
Shrubland Temperate suitable resident
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Livestock farming & ranching - Agro-industry grazing, ranching or farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Ecosystem degradation
Agriculture & aquaculture Wood & pulp plantations - Agro-industry plantations Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Ecosystem conversion
Climate change & severe weather Temperature extremes Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Species mortality
Human intrusions & disturbance Recreational activities Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Species disturbance
Natural system modifications Fire & fire suppression - Trend Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Ecosystem degradation

Recommended citation
BirdLife International (2022) Species factsheet: Curruca undata. Downloaded from http://www.birdlife.org on 07/10/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 07/10/2022.