Dartford Warbler Sylvia undata   [Boddaert, 1783]

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Order: Passeriformes Family: Sylviidae
BTO Codes: DW, DARWA EURING No: 12620
Number in Britain: 3200 Pairs (Summer)
Conservation Status:
UK: AMBER
European: 2 Concern, most in Europe; Depleted
Global: Near Threatened (Details)
Status in UK: (A)  Resident Breeder
Subspecies: dartfordiensis recorded in Britain (of 3 subsp. in the world)
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Length: 12 cm Wingspan: 16 cm Weight: M/F: 10 g    
Scientific name from: L.: silva=a wood and L.: undatus=wavy (from unda=a wave)
World Distribution: w Europe, nw Africa
Habitat: Scrub, heath
Diet: Arthropods, occ. fruit, mainly in low scrub
TitBit: Really a bird of Mediterranean climes, the Dartford Warbler suffers extremely from cold winters, following the severe winters of 1961/63, the breeding population collapsed from 450 pairs to just 10.  
Identification Tips:
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  Videos from IBC
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Crossley ID photos

Population and Distribution

Population Trend: No population trend available
Distribution: No distribution maps available
British Population Size:
    Summer: 3200 Pairs in 2006
    First Record: 1773
    Latest Survey: Wotton, S. et al. (2009) British Birds 102:230-246
    Conservation Status: AMBER because Species of European Concern, Localised Breeding Population,
   Previous Assessments: 2002-2007 AMBER     1996-2001 RED  
   Races of Concern: dartfordiensis AMBER (Rare or Localised)
Habitat Occupancy (in the Breeding Season):
    No habitat data from BBS
European Population Size:
    Summer: 1.9 to 3.7 million pairs   (Trend in Numbers)
Population Assesment from Birds in Europe
Distribution in Europe mapped by the EBCC Atlas
Listed on the Appendices/Schedules of: WCA(I,IV),WBD(I), Bern(III), Bonn(II)
Survey Results: Results from BirdTrack

Breeding and Survival

Egg Size: 17 x 13 mm Egg Weight: 1.4 g (of which 6 % is shell)
Number of Nest Records: 12
Clutch Size: 4 eggs
Incubation: 12- 14 days   by the: Female (occ. Male)
Fledging: 10 - 14days as: Altricial, naked
First Clutches Laid: Unavailable
Number of Broods: 2(3)
Number Ringed: Annual Totals
Adult Survival: 0.500 ± 0.083       
Juvenile Survival: No data
Age at First Breeding: Typical Lifespan: No data
Maximum Recorded Age: 3 years 8 months 8 days (set in 1986)
Read a summary of Ringing Recoveries

Biometrics

Ring Size: A
Wing Length Adult: 53.4 ± 1.5 Range 51 - 56 mm, N =198
Juvenile: 65.3 ± 1.4 63 - 67 mm, N =38
Male: 53.8 ± 1.4 52 - 56 mm, N =137
Female: 52.3 ± 1.4 50 - 54 mm, N =53
Weight Adult: 9.38 ± 0.67 Range 8.40 - 10.40 g , N =173
Juvenile: 12.28 ± 1.91 9.50 - 16.10 g , N =36
Male: 9.27 ± 0.60 8.35 - 10.10 g , N =120
Female: 9.59 ± 0.81 8.50 - 11.00 g , N =45
Source:
British Trust for Ornithology (2005) Ringing Scheme data

Other Names

 
Gaelic: Welsh: Telor Dartford
Danish: Provencesanger Dutch: Provençaalse grasmus
Finnish: Ruskokerttu French: Fauvette pitchou
German: Provencegrasmücke Hungarian: Bujkáló poszáta
Icelandic: Busksöngvari Irish: Ceolaire Fraoigh
Italian: Magnanina Norwegian: Provencesanger
Polish: Pokrzewka kasztanowata Portuguese: Felosa-do-mato
Spanish: Zarcero común Swedish: Provencesĺngare
Local Names: Furze Wren

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