Erfassungsstandards für Fledermäuse bei Windkraftprojekten in Wäldern

Standardised and referenced acoustic monitoring reliably estimates bat fatalities at wind turbines: comments on ‘Limitations of acoustic monitoring at wind turbines to evaluate fatality risk of bats’

“…What happens when rotor diameters increase but turbine height does not and, in consequence, rotor tips reach closer to the ground? Answers could be drawn from detailed information on the vertical distribution of bats which is, so far, available from studies at meteorological towers and cranes (Hurst et al 2017, Roemer et al 2017, 2019, Wellig et al 2018) – we suggest that the vertical distribution of bats at wind turbines should be a future focus in research. Voigt et al (2021) present a schematic concept on the effect of the vertical distribution of bats on their detectability by recorders installed in the nacelle (fig.…”

“…One reason is that bat activity in the detection range of a microphone installed below the turbine nacelle is much higher than the average in the entire rotor‐swept zone, resulting in adequate information to estimate the number of collisions. The reasons for this are, at least in Europe, the decrease in the total activity of all species with the height above ground (Hurst et al 2017, Wellig et al 2018, Bach et al 2020), and the concentration of bats around the nacelle as compared to in free air space at the same height (Cryan et al 2014, Behr et al 2015). However, more important than detection range are the standardisation and referencing of acoustic recordings to infer collisions from bat activity at the nacelle (e.g.…”