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Activity of forest specialist bats decreases towards wind turbines at forest sites  

Author:  | Germany, Wildlife

Abstract

Worldwide, wind turbines are increasingly being built at forest sites to meet the goals of national climate strategies. Yet, the impact on biodiversity is barely understood. Bats may be heavily affected by wind turbines in forests, because many species depend on forest ecosystems for roosting and hunting and can experience high fatality rates at wind turbines.

We performed acoustic surveys in 24 temperate forests in the low mountain ranges of Central Germany to monitor changes in the acoustic activity of bats in relation to wind turbine proximity, rotor size, vegetation structure and season. Call sequences were identified and assigned to one of three functional guilds: open-space, edge-space and narrow-space foragers, the latter being mainly forest specialists.

Based on the response behaviour of bats towards wind turbines in open landscapes, we predicted decreasing bat activity towards wind turbines at forest sites, especially for narrow-space foragers.

Vertical vegetation heterogeneity had a strong positive effect on all bats, yet responses to wind turbines in forests varied across foraging guilds. Activity of narrow-space foragers decreased towards turbines over distances of several hundred metres, especially towards turbines with large rotors and during mid-summer months. The activity of edge-space foragers did not change with distance to turbines or season, whereas the activity of open-space foragers increased close to turbines in late summer.

Synthesis and applications. Forest specialist bats avoid wind turbines in forests over distances of several hundred metres. This avoidance was most apparent towards turbines with large rotors. Since forests are an important habitat for these bats, we advise to exclude forests with diverse vegetation structure as potential wind turbine sites and to consider compensation measures to account for habitat degradation associated with the operation of wind turbines in forests.

Julia S. Ellerbrok, Conservation Ecology, Department of Biology, University of Marburg, and Evolutionary Ecology, Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany

Anna Delius, Conservation Ecology, Department of Biology, University of Marburg, Germany

Franziska Peter, Natural Resource Conservation, University Kiel, Germany

Nina Farwig, Conservation Ecology, Department of Biology, University of Marburg, Germany

Christian C. Voigt, Evolutionary Ecology, Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany

Journal of Applied Biology: 09 July 2022, doi:10.1111/1365-2664.14249

Download original document: “Activity of forest specialist bats decreases towards wind turbines at forest sites

This material is the work of the author(s) indicated. Any opinions expressed in it are not necessarily those of National Wind Watch.

The copyright of this material resides with the author(s). As part of its noncommercial effort to present the environmental, social, scientific, and economic issues of large-scale wind power development to a global audience seeking such information, National Wind Watch endeavors to observe “fair use” as provided for in section 107 of U.S. Copyright Law and similar “fair dealing” provisions of the copyright laws of other nations. Queries e-mail.

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