Aquatic Warbler Acrocephalus paludicola


Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: # _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
- - A2c

Red List history
Year Category Criteria
2016 Vulnerable A2c
2013 Vulnerable A2c
2012 Vulnerable A2c
2008 Vulnerable A2c
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

Migratory status full migrant Forest dependency Does not normally occur in forest
Land mass type Land-mass type - continent
Average mass -

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 578,000 medium
Extent of Occurrence non-breeding (km2) 1,320,000 medium
Extent of Occurrence breeding/resident (km2) 1,500 medium
Number of locations 11-100 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 22000-32000 good estimated 2009
Population trend Decreasing medium suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations 2-100 - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 4.4 - - -

Population justification: The global population is estimated at 11,000-16,000 singing males (M. Flade in litt. 2012), equivalent to 22,000-32,000 mature individuals or 33,000-48,000 individuals in total. The European population is estimated at 9,000-13,800 calling or lekking males, which equates to 18,000-27,600 mature individuals or 27,000-41,400 individuals (BirdLife International 2015).

Trend justification: The majority of Aquatic Warblers now breed in Europe, where data collated for the European Red List of Birds (BirdLife International 2015) estimated that populations are continuing to decrease by 30-49% in 13.2 years (three generations). Outside Europe remaining populations are small and considered at high risk of extinction.

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Algeria N Extant Yes
Andorra U Extant Yes
Austria N Extinct Yes
Belarus N Extant Yes
Belgium N Extant Yes
Bulgaria N Extant Yes
Burkina Faso U Extant Yes Yes
Croatia N Extant
Cyprus V Extant
Czechia N Extant Yes
Denmark V Extant
Egypt V Extant
Estonia V Extant
Finland V Extant
France N Extant Yes
Germany N Extant Yes Yes
Ghana N Extant Yes
Greece V Extant
Hungary N Extinct Yes
Ireland V Extant
Israel V Extant
Italy N Extant Yes
Kazakhstan V Extant
Latvia N Extant Yes
Lithuania N Extant Yes
Luxembourg N Extant Yes
Mali U Extant Yes
Malta V Extant
Mauritania N Extant Yes
Montenegro N Extinct Yes
Morocco N Extant Yes
Netherlands N Extant Yes
North Macedonia V Extant
Norway V Extant
Poland N Extant Yes
Portugal N Extant Yes
Romania N Extant Yes
Russia N Possibly Extinct Yes
Russia (Central Asian) N Possibly Extinct Yes
Russia (European) N Possibly Extinct Yes
San Marino U Extant Yes
Senegal N Extant Yes
Serbia N Extinct Yes
Slovakia N Extinct Yes
Slovenia N Extant Yes
Spain N Extant Yes
Sweden V Extant
Switzerland N Extant Yes
Tunisia V Extant
Turkey V Extant
Ukraine N Extant Yes
United Kingdom N Extant Yes
Western Sahara N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Belarus Balota Dzikoje
Belarus Yaselda
Belarus Sporovo
Belarus Balota Zvaniec
Belarus Mid Prypiac'
Belarus Vyhanaščanskija baloty
Belarus Haradzienskaja Svislač
Lithuania Zuvintas Biosphere Reserve
Lithuania Nemunas delta regional Park
Lithuania Kauno Marios water reservoir & eastern coastal zone
Lithuania Flooded coastal meadows near Tyrai bog
Bulgaria Dolni Bogrov-Kazichene
Bulgaria Mechka Fish-ponds
Bulgaria Strandzha
Slovenia Sečovlje saltpans
Poland Biebrza river valley
Poland Bubnow Marsh
Poland Chelm calcareous marshes
Poland Warta River Mouth
Poland Delta of the Swina river
Poland Marshy Valley of the Narew River
Poland Ner River Valley
Poland Szczecin lagoon
Poland Rozwarowo Marshes
Poland Lower Odra river valley
Poland Miedwie site
Poland Nietlice marshes
Poland Upper Narew River Valley
Poland Narew river gaps
Poland Rakutowskie swamps
Hungary Hortobágy and Tisza-to
Russia (European) Watershed of Bityug and Tsna rivers
Russia (European) Nizhnekamskaya flood-plain
Russia (European) Kamsko-Yayvenski wetland
Russia (European) Bel'skaya flood-plain
Spain Chingudi-Bidasoa estuary
Spain Costa da Morte
Ukraine Supij marsh
Ukraine Shats'ki lakes
Ukraine Korotchenkivs'ki meadows
Ukraine Pryp'yat' river valley
Ukraine Stokhod river valley
Ukraine Turiya river valley
Ukraine Vovk river valley
France Sologne Bourbonnaise
France Domaine d'Orx
France Réserve Naturelle du courant d'Huchet
France Marais de la Baie d'Audierne
France Estuaire et embouchure de la Seine
France Estuaire de la Gironde : marais de la rive nord
France Marais de Brière
France Marais poitevin et baie de l'Aiguillon
Italy River Po: from the mouth of Adda river to Ostiglia
Italy Valli di Argenta
Italy Ponziane islands
Italy Simeto mouth and middle course and Biviere di Lentini
Czechia Hermansky stav-Odra-Poolsi wetlands
Germany Lower Oder valley
Germany Peenetal (Peenetalmoor and Anklamer Stadtbruch)
Germany Barnbruch
Germany Danube valley: Regensburg-Vilshofen
Germany Danube valley: Neu-Ulm - Lauingen incl. Faiminger Stausee, Donau-Moos, and Gundelfinger Moos
Germany Wagbach lowlands
Ukraine Svydovets protected area
Belarus Sporaŭskaje balota
Ukraine Styr' river valley (Kolky village)
Ukraine Udaj river valley
Ukraine Syra Pogonya mire
Mauritania Gâat Mahmoûdé
Russia (European) Neman river Delta and the coast of the Curonian Bay
Belarus Al'manskija baloty
Belarus Prostyr
Belarus Biarezina-Hajna
Belarus Servač
Belarus Lelchitsy-Ubort
Russia (Central Asian) Yarovskoe marsh
Russia (Central Asian) Bol'shie Chertany Lake
Latvia Liepaja lake
France Marais entre Crau et Grand Rhône: Meyranne, Chanoine, Plan de Bourg et Salins du Caban
France Bassin d'Arcachon et Banc d'Arguin
France Etang de Lindre
France Val de Chiers et environs de Spincourt
France Etangs Montpellierains
France Etang du Bagnas
France Camargue
France Estuaire de la Charente
France Anse de Fouras, baie d'Yves et marais de Rochefort
France Ile d'Oléron, marais de Brouage-Saint-Agnant
France Anse du Fiers d'Ars en Ré
France Estuaire de la Loire
France Lac de Grand-Lieu
France Baie de Bourgneuf et marais breton
France Basses Vallées Angevines
Russia (Central Asian) Busly lake
Ukraine Urochysche Mushevo
United Kingdom Marazion Marsh
Italy River Mincio and Bosco Fontana
Poland Wizna Swamps
Poland Szyszla River Valley
Netherlands Duinen Ameland
United Kingdom Weymouth Wetlands
Germany Greifswalder Bodden
Luxembourg Valley of the Syre
Luxembourg Upper Valley of the Alzette
Luxembourg Haff Réimech
Poland Siemianowka Reseirvoir
Belarus Dzivin - Vialiki Lies
Lithuania Flooded coastal meadows near Svencele raised-bog
Lithuania Flooded meadows near Sausgalviai settlement
Kazakhstan Iskrinskie Pine Forests
Poland Woniesc reservoir
Poland Kampinos forest
Poland Nida Rivar Valley
Poland Polesie
Poland Middle Bug river valley
Belarus Ščara floodplain
Spain Tierra de Campos steppes
Spain Carrión-Frómista
Spain Salburua
Spain Ría de Villaviciosa
Spain Esteiro do Miño
Spain Páramo Bajo de León
Italy Sentina

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Pastureland suitable breeding
Artificial/Terrestrial Pastureland suitable non-breeding
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands major breeding
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands major non-breeding
Altitude 0 - 200 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Agro-industry farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Ecosystem degradation, Ecosystem conversion
Biological resource use Gathering terrestrial plants - Unintentional effects (species is not the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Ecosystem degradation
Climate change & severe weather Droughts Timing Scope Severity Impact
Ongoing Unknown Unknown Unknown
Ecosystem degradation
Natural system modifications Dams & water management/use - Large dams Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Ecosystem degradation

Purpose Primary form used Life stage used Source Scale Level Timing
Pets/display animals, horticulture - - International Non-trivial Recent

Recommended citation
BirdLife International (2021) Species factsheet: Acrocephalus paludicola. Downloaded from on 25/10/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from on 25/10/2021.