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Résumé :
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On the basis of a few examples of breeding birds the article descibes the changes in density that have occurred in the southern parts of the Allgau (Bavaria, Germany) over the last 150 years. Of the 135 species that have been recorded as regulary breeding since 1975 12% show a significantly declining and 7% a rising tendency. Of 9 sharply declining species (Lapwing, Common Snipe, Skylark, Tree Pipit, Whinchat, Redstart, Whitethroat, Icterine Warbler and Yellowhammer) and of those breeding birds that arrived only in the 20th century such as the Tufted Duck, Collared Dove, Fieldfare and Scarlet Rosefinch the chronological development and the present status are documented.
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