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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Breeding habitat, abundance and conservation status of the Aquatic Warbler Acrocephalus paludicola in Belarus (1999)
Auteurs :	Alexander Kozulin, Auteur ; Martin Flade, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (120(2) 1999)
Article en page(s) :	97-111
Résumé :	More than half of the entire population of the globally threatened Aquatic Warbler is concentrated in the south-west of Belarus. When the Belarusian population was discovered in 1995-1997, a strong decline due to mire destruction by drainage and abandonment was still in progress. Since 1995, nearly all potential Aquatic Warbler sites have been investigated and studies on population development, habitat structure, breeding success and diet of the species have been initiated. Belarus holds a population of 7,300 - 13,000 singing male at 12 sites, but more than 95 % of the population are concentrated in six large fen mire tracts. The major habitat factors affecting population density were identified (Tab. 2 and 3). The Aquatic Warbler is a true stenotopic species preferring exclusively particular fen mire types which are characterised by mesotrophic to poor eutrophic level, constant water table near the soil surface, medium vegetation height and density, and high coverage of the mire surface by green mosses. Many or most of Aquatic Warbler pairs seem to produce two broods within the breeding saison, but fluctuations in numbers and movements between different sites within one breeding saison are frequent, depending on water table changes (Tab. 8). The density is also affected by burning: after spring fires the density drops to a minimum level and is restored completely only two years after fire (Tab. 7). We estimate from retrospective balance of fen mire areas, that the population size of Aquatic Warbler must have suffered a decline by more than 90 % within the last 30 years. Other factors threatening the species are changes in water regime, water pollution and eutrophication, overgrazing, early hay-cutting, unsuitable methods of spring burning, and vegetation succession (overgrowing with shrubs or reeds) due to abandonment of hydrologically altered fen mires. Finally, consequences for conservation and research are summarised (chapter 6).

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