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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Habitat selection of Aquatic Warbler Acrocephalus paludicola in Poland: Consequences for conservation of the breeding areas (1999)
Auteurs :	Janusz Kloskowski, Auteur ; Jaroslaw Krogulec, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (120(2) 1999)
Article en page(s) :	113-120
Résumé :	In parallel to the countrywide census of Aquatic Warblers Acrocephalus paludicola in Poland in 1997, data on breeding habitat characteristics were collected. Using multivariate statistics, the habitat features could be ordered along two gradients: from open areas with rare, coarse-grained patches of shrubs to those dominated by scattered shrubs, and from flat grass fen with shallow water to distinctly tufty, deeper flooded, and reed-dominated areas. These two gradients generally correspond to two successional processes in wetlands occupied by Aquatic Warblers: (a) colonisation by shrubs due to lowering of the water table and abandonment of agricultural use, and (b) invasion of reed associations in the vicinity of drainage channels. Densities of singing Aquatic Warbler male were negatively correlated with the first gradient, but there was no significant relationship with the second. Reed associations are inhabited by Aquatic Warblers in Western Pommerania, where reeds are harvested every year, whereas singing male were only occasionally recorded in this habitat in other parts of Poland, where no industrial reed exploitation occurs. Areas occupied by Aquatic Warbler and unoccupied, closely associated habitats differed with regard to both gradients. This indicates that breeding habitat suitability may be the most important factor limiting Aquatic Warbler populations. We conclude that overgrowing of open wetlands by shrub and reed vegetation is the principal reason for breeding habitat loss in Poland. Conservation measures are discussed, including those associated with low-intensity agricultural use of the wetlands comprising Aquatic Warbler breeding grounds.

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