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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Occurence and population sizes of rare and scarce breeding birds in Germany 1997-2003.
Auteurs :	Martin Boschert, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (126(1) 2005)
Article en page(s) :	1-51
Résumé :	The population sizes of 78 rare or scarce breeding bird species in Germany are presented for the years 1997 to 2003. Additionally, 16 further species are listed of which breeding attempts or observations during the breeding season have been recorded in Germany since 1997. The paper is the result of a survey carried out by ornithological organisations and nature conservation agencies of the German federal states under the leadership of the DDA (Dachverband Deutscher Avifaunisten). The survey encompasses 94 species which have less than 1000 breeding pairs in Germany or are confined to limited areas (including colonial breeders). For 78 of these 94 species the survey yielded sufficient data to warrant statements on population trends Since the mid- 1990s. Two of the 78 species did not breed during the years 1997-2003, twelve others bred in only one federal state. 32 species (41%) showed positive population trends, 14 of them in excess of 50%. 33 species (42%) showed no significant change, 13 (17%) decreased. Reasons for the population changes have not changed since the last survey and are attributed to anthropogenic and climate-induced habitat changes, reduced persecution and intensive landscape management and protection projects. Species with increasing population trends are for example Black Stork and White Stork, several raptor species such as White-tailed Eagle, Osprey or Peregrine Falcon and some seabirds like Gannet, Guillemot, Razorbill or Kittiwake with the only breeding site in Germany on Helgoland. While the Cormorant seems to profit from a general increase in water eutrophication and accelerated turnover rates, in contrast, species like Goosander or Red-crested Pochard profit from a reduced eutrophication with corresponding changes in their preferred food. The situation in Germany is extremely critical for Dunlin, Ruff, Aquatic Warbler and Woodchat Shrike, and critical for example for Kentish Plover and (particularly outside the Alps) for Black Grouse. 17 species lost major parts of their breeding range, e.g. Short-eared Owl, on the other hand, 25 species could recently expand their range or re-occupy lost ground.

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