Marsh Warbler Acrocephalus palustris   [Bechstein, 1798]

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Date created: 23-January-2017

Order: Passeriformes Family: Sylviidae
BTO Codes: MW, MARWA EURING No: 12500
Number in Britain: 50 records/year
Conservation Status:
European: Least Concern
Global: Least Concern (Details)
Status in UK: (A)  Scarce Migrant Breeder, Passage Visitor
Subspecies: Monotypic
Length: 13 cm Wingspan: 20 cm Weight: M/F: 13 g    
Scientific name from: Gr.: akros=pointed + kephale=head and L.: palus=a marsh
World Distribution: BREEDS: c Europe, Near East, WINTERS: e Africa
Habitat: Scrub, grassland
Diet: Insects and spiders also snails and occ. berries
TitBit: Like many other Acrocephalus warblers, the Marsh warbler is a good songster, and an individual bird can sing for extended periods, sometimes up to an hour continuously, and mimics the songs of birds from both its breeding and wintering range.  
Identification Tips:
  Images from IBC or search flickr
  Videos from IBC
  Sound from xeno-canto
Crossley ID photos

Population and Distribution

Population Trend: No population trend available
Distribution: Atlas Mapstore   
British Population Size:
    Passage: 50 individuals
    Summer: 5 to . Pairs in
    First Record: Hampshire, 1863
    Latest Survey: Musgrove, A. et al. ((2013)) British Birds 106:64-100
    Conservation Status: RED because Recent Breeding Population Decline (1981-2010), Recent Winter Population Decline (1981-2010), Recent Breeding Range Decline (1981-2010), Recent Winter Range Decline (1981-2010),
   Previous Assessments: 2009-2014 RED     2002-2007 RED     1996-2001 RED  
   Races of Concern:
UK Biodiversity Action Plan (Lead Partner: RSPB, Wildlife Trusts)
Habitat Occupancy (in the Breeding Season):
    No habitat data from BBS
European Population Size:
    Summer: 2.2 to 3.8 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), Bern(III), Bonn(II), NERC (41)
Survey Results:

Breeding and Survival

Egg Size: 19 x 14 mm Egg Weight: 1.9 g (of which 6 % is shell)
Number of Nest Records: 1
Clutch Size: 4 - 5 eggs
Incubation: 12- 14 days   by the: Male + Female
Fledging: 10 - 11days as: Altricial, naked
First Clutches Laid: Does not breed in Britain, or too few Nest Records
Number of Broods: 1
Number Ringed: Annual Totals
Adult Survival: No data
Juvenile Survival: No data
Age at First Breeding: Typical Lifespan: No data
Maximum Age from Ringing: 7 years 10 months 22 days (set in 1993)
Read a summary of Ringing Recoveries


Ring Size: A
Wing Length Adult: 70.5 ± 1.7 Range 67 - 73 mm, N =53
Juvenile: 68.3 ± 1.6 66 - 71 mm, N =21
Male: Insufficient Data
Female: Insufficient Data
Weight Adult: 12.87 ± 1.10 Range 11.40 - 15.00 g , N =49
Juvenile: 12.70 ± 2.37 9.75 - 17.55 g , N =20
Male: Insufficient Data
Female: Insufficient Data
British Trust for Ornithology (2005) Ringing Scheme data

Other Names

Gaelic: Ceileiriche-fèithe Welsh: Telor y Gwerni
Danish: Kærsanger Dutch: Bosrietzanger
Finnish: Luhtakerttunen French: Rousserolle verderolle
German: Sumpfrohrsänger Hungarian: Énekes nádiposzáta
Icelandic: Seljusöngvari Irish: Ceolaire Corraigh
Italian: Cannaiola verdognola Norwegian: Myrsanger
Polish: Lozówka Portuguese: Felosa-palustre
Spanish: Carricero políglota Swedish: Kärrsångare

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