| Titre : | Birds breeding in reedbeds at the southern Baltic Sea coast: What effect does reed harvesting have on population densities? |
| Auteurs : | Jan Kube, Auteur ; Sandra Probst, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (120(1) 1999) |
| Article en page(s) : | 27-38 |
| Résumé : | Densities of breeding bird populations were determined in 1998 in brackish water reedbeds on the island of Ruegen, German Baltic Sea coast. In order to determine potential effects of reed harvesting, we measured various parameters of the reed vegetation in mid April on seven study plots (ca. 10 ha each). Bird territories were mapped during April-June. Reedbeds that had been harvested up to two years prior to this study were easily recognised by their high density of seed-producing Phragmites plants and lack of a herbal layer. On harvested plots the average stem diameter was significantly lower than on unharvested plots, the density of stems per unit area was slightly higher. Ten nonpasserine waterbird species and four typical reed-dwelling passerines were found breeding. Overall breeding success was extremely low, mostly due to predation by wild boar Sus scrofa and fox Vulpes vulpes. Bearded Reedlings Panurus biarmicus nested only in mature reedbeds that had not been harvested for at least 3 years, Marsh Warblers Acrocephalus palustris nested only in unharvested low reeds. Over 80 % of Reed Warbler A. scirpaceus and Reed Bunting Emberiza schoeniclus territories were located in reedbeds not subject to prior harvest. Population density of Reed Warbler was negatively related to the proportion of reed area harvested during the previous winter. Reed Bunting was the only species that appeared to profit from reed harvest, probably due to its preference for edge habitats. The results show that on the island of Rugen reed harvesting renders the habitat unsuitable for bird species typical of this habitat for at least two to three years. Modifications of the presently employed reed havesting schedule are proposed. |
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