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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Changes in the breeding bird populations at Lake Constance - results from semi-quantitative grid censuses in 1980, 1990, and 2000.
Auteurs :	Hans-Guenther Bauer, Auteur ; Markus Peintinger, Auteur ; Georg Heine, Auteur ; Ulrich Zeidler, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (126(2) 2005)
Article en page(s) :	141-160
Résumé :	,Population trends in breeding birds at Lake Constance (SW-Germany/Switzerland/Austria; 1120-km(2)) are examined using line-transect data of 303 tetragons from three census periods (1980-1981, 1990-1992, and 2000-2002). In total, 159 breeding species were recorded, 154 of which in-the most-recent census period. Altogether, 52 species showed significant population Or (re-)settled in the area, 52 significantly declined (or were lost as breeding species), in a further 16 species significant areal changes (mostly expansions) could be found, the remaining species showing no significant trends. Most dramatic declines occurred in gr0lind-nesting birds of farmlands,and wet meadows (and also forests), where formerly abundant species such as Skylark and Grey Partridge also showed a massive reduction in area of occupancy. A further decline was noted in long-distance migrants which now comprise well below 10% of all breeding territories recorded, On the other hand, the percentage of residents increased, and the majority of bird species of wetlands as well as some urban species were found to have larger populations (and areas of occupancy). The data convey a general trend of a reduction in the number of bird species and individuals recorded per unit square (tetrad), and support the hypothesis that the study area has suffered from a loss in bird biomass.

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