Species fact sheet by Global Register of Migratory Species - www.groms.de
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Acrocephalus paludicola (Vieillot, 1817)
Synonym:
Family: Muscicapidae
Order: Passeriformes
English: Aquatic warbler
French: Phragmite aquatique
Spanish: Carricerín
German: Seggenrohrsänger (There's a German version of this page!)
Norwegian: Vannsanger (There's a Norwegian version of this page!)
Migration: intercontinental
Migration details: “Locally scarce summer migrant of western Palearctic, from eastern Germany and Poland east across western and central Russia to western Siberia and south to Hungary. Winters in subtropical to tropical climatic zones of West Africa.”
Baker K, 1997, Warblers of Europe, Asia and North Africa, p. [...], Christopher Helm Ltd, London
“Local summer visitor Germany, Poland, Czechoslovakia, ? Austria (has bred), Hungary, Romania, European USSR; winters west tropical Africa (wintering grounds little known). Scarce migrant UK, Channel Is., France (has bred), Belgium (has bred), Netherlands (has bred), Germany (formerly bred), Switzerland, Italy. Vagrant Eire (12), Spain (44), Luxembourg, Denmark (15), Norway (6), Sweden (17), Finland (3), Malta, Romania (outside breeding areas), Yugoslavia (may breed), Greece, Bulgaria, Turkey, Cyprus, Jordan, north-west Africa, Canary Is., Azores.”
Parmenter T, Byers C, 1991, A guide to the Warblers of the Western Palaearctic, p. [...], Bruce Coleman Books, Uxbridge, Middlesex
Regions: Europe, North Africa, North Asia, Sub-Saharan Africa, West & Central Asia

map about the distribution of Acrocephalus paludicola 

“The long-distant migrant Acrocephalus paludicola is known to breed in mid latitudes of the western Palearctic, in mainly continental lowlands. Serious habitat destruction due to drainage and intensive agriculture has led to extinction of breeding populations all over western Europe. The species' decline has been observed at a rate of 40% within the last ten years, and is predicted at a similar rate for the future. It is therefore considered as "Vulnerable" (VU) (Hilton-Taylor 2000) and listed in Appendix I and II of the CMS. The western breeding population is nowadays restricted to the far north-east of Germany and to Hungary and Poland - with the Polish Biebrza marshes as largest breeding site. Autumn migration commences in July, along a western route to major stopping-over areas in Holland, Belgium, France and the United Kingdom, prior to moving south to West-Africa (de By 1990). Recent surveys have discovered previously unknown populations in the eastern part of its range, (Hilton-Taylor 2000), but migratory routes and wintering sites of eastern populations remain unknown (Glutz von Blotzheim 1991).”
Riede, K. (2001): Global Register of Migratory Species. Weltregister wandernder Tierarten. Münster (Landwirtschaftsverlag), p. 227

"[The] Aquatic warbler is one of the few globally threatened species registered in Norway (IUCN). The Slevdalsvann is the only known resting place for migrating aquatic warblers in Norway. There has been registered a growing number of migrating aquatic warblers in the Slevdalsvann between 1938 and 1996."
Fylkesmannen i Vest-Agder (2001): Verneplan Slevdalsvannet (Farsund kommune, Vest-Agder), p. 38

(translated by Ansgar Tappenhölter)

Further detailed information from the GROMS-database

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by Ansgar Tappenhölter