Dartford Warbler Sylvia 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 -
Extent of occurrence (EOO)

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 -
Fragmentation -
Population and trend
Estimate 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 - - -
Largest subpopulations - - -
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
France Baie des Veys et Marais du Cotentin
France Basses Corbières
France Chaîne des Alpilles
France Champ de Tir du Poteau
France Gorges de la Dourbie et causses avoisinants
France Hautes Corbières
France Hautes garrigues du Montpellierais
France Iles Chausey
France Le Pinail, Forêt de Moulière et bois du Défens
France Marais de la Baie d'Audierne
France Massif du Petit Lubéron
France Massifs de Fontainebleau et zones humides adjacentes
France Minervois
France Montagne Sainte-Victoire
France Plaine des Maures
France Vallée du Régino
Italy Arezzo heathlands
Italy Asinara island, Piana island and Stintino peninsula
Italy Eolie islands
Italy Madonie
Italy Peloritani mountains
Italy Tuscan Archipelago
Portugal Luzianes
Portugal Serra de Monchique
Portugal Serra de Penha Garcia e Campina de Toulões
Spain El Rebollar
Spain Fausilla mountains
Spain La Cabrera mountain range
Spain Peña Labra and Cordel mountain ranges
Spain Rosarito and Navalcán reservoirs-La Iglesuela (Tietar valley)
United Kingdom Ashdown Forest
United Kingdom Dorset Heaths and Forests
United Kingdom East Devon Heaths
United Kingdom Haldon Forest
United Kingdom New Forest
United Kingdom Poole Harbour
United Kingdom Thames Basin Heaths
United Kingdom Wealden Heaths

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 (2020) Species factsheet: Sylvia undata. Downloaded from http://www.birdlife.org on 28/03/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 28/03/2020.