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  Windenergie und Fledermäuse
Das englische Abstract der nebenstehenden Untersuchung zu den Auswirkungen von Windenergieanlagen in der Schweiz: "In this study we evaluated the occurrence of bat mortality caused by wind turbines in Switzerland. From about 20 existing wind turbines in year 2007 we selected five medium to large sized turbines in two hilly regions of Switzerland. Between June and October we searched 10 times in regular intervals for carcasses on the ground (total 50 controls) in a circle of up to 40m distance to the tower. We measured detectability and bait removal rates by experiments at every site (using 12 dummy bats and 10 dead mice per site, respectively). Two bat carcasses were found at two sites, one of the migrating species N. leisleri in August, another in September, belonging to the non-migrating species P. pipistrellus. The detectability was 74 ± 13% (mean ± SD). The removal rate was 72 ± 25% in the first 2-3 days and an average of 91% in the control intervals of 15 days. Estimates of seasonal bat mortality, corrected for season, detectability and removal rate, revealed an average of 8.2 (range 4.9 – 11.4) dead bats per turbine and season. This study demonstrates the occurrence of bat mortality caused by wind turbines in Switzerland. However the estimated mortality per season remains in international comparisons small to medium at the studied sites. The mortality of individuals of endangered and protected species is a serious issue, but most important, the long-term effect on populations is difficult to assess. In the case of the investigated wind turbines the negative impact on bats does not generally preclude the development of wind energy sites in Switzerland. We recommend avoiding sites in and near woodlands. The abundance of local and migratory bats at planned sites should be evaluated, obligatory in the case of larger wind parks and at exposed sites (ridge tops, mountain passes, river valleys), in order to consider adequately bat conservation."

Leuzinger, Y., Lugon, A. & Bontadina, F. 2008. Éolienne en Suisse - Mortalité de chauves-souris. Rapport inédit sur mandat de l'OFEV et l'OFEN, 37 pages. (pdf, 2.4 MB)

Website des Bundesamtes für Umwelt BAFU

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