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Bats and wind energy in woodland III

Project title: Additional research on the impacts of WT on bats in woodland

Focus

  • Do the roosts and hunting habitats of bats move after the construction of wind turbines?
  • Do bats adopt typical compensation measures?
  • Recommendations for standards for the selection of wind energy site

Contact

Freiburger Institut für angewandte Tierökologie (FRINAT) GmbH
Dunantstr. 9, 79110 Freiburg

Johanna Hurst
hurst(at)avoid-unrequested-mailsfrinat.de
Tel.: +49 761 208 999 63

Dr. Robert Brinkmann
brinkmann(at)avoid-unrequested-mailsfrinat.de

 

 

Funding

FKZ 3518 86 1000
Departmental research plan 2018
Term: November 2018 – October 2022

The continued environmentally compatible expansion of renewable energies is progressing. Sites in woodland, for example, are being increasingly developed for wind energy. There is still a need for research on the impacts of wind turbines on various species in woodlands. This project looks into how sensitive woodland bat species such as Bechstein's bat and the brown long-eared bat react to the operation of wind turbines in the core area of their nursery colonies. In addition, studies were carried out at wind farms already in existence and at a reference site.

The aim of the research is to find out whether bat colonies suffer significant disturbance due to the operation of wind turbines in woodlands and whether wind turbines cause loss of habitat beyond the actual cleared area. Disturbance effects of this kind cannot be ruled out, particularly for passive acoustic gleaning species such as the brown long-eared bat and Bechstein's bat. For these species, operation of wind turbines could lead to the colony centres being moved away from the turbines and avoidance of a considerable area of woodland around the turbines which would therefore be lost as a hunting habitat. In this case, compensatory measures would have to be planned covering a larger area.

The following research questions need to be answered in detail:
•    After the construction of wind turbines, do the colony centres and/or activity areas of bat colonies move due to disturbance effects? How far away from the turbines can these effects still be detected?
•    Are typical compensatory measures (e.g. putting up bat boxes) accepted by the colonies? How might the effectiveness of the measures be increased?
•    Under what conditions (e.g. distance of the colony from the WT sites) can it be assumed that a local population will be endangered or significantly disturbed by the construction and operation of wind turbines?

Methods

For the after surveys, sites will be used where before surveys of the brown long-eared bat have already taken place in the precursor project during two years. At these sites (a planned wind farm and a reference site), roost and habitat use as well as colony sizes will be intensively investigated in two consecutive years and compared with the results before the construction of the wind farm.

In addition, colonies of the Bechstein's bat will be investigated in two existing wind farms using similar methods. As one of these wind farms has been in existence for a long time, this study also makes it possible to determine long-term effects on bat colonies. However, as there are no comparable surveys available for these investigations prior to the construction of the wind farm, it will instead be checked whether the use of space and roosts corresponds to the pattern to be expected based on the habitat configuration. In addition, it will be examined whether the operation of the wind farm influences the behaviour of the bats.

Work packages

Work packages

  1. After-studies of two colonies of Bechstein's bat in existing wind farms in woodland.
  2. Additional after-studies on colonies of the brown long-eared bat in an established wind farm and a reference area.
  3. Further development of country-wide recommendations for before-studies and measures at wooldand sites

Project partners

Project partners

Project management

Freiburger Institut für angewandte Tierökologie (FRINAT) GmbH
Dunantstr. 9, 79110 Freiburg

Johanna Hurst
hurst(at)avoid-unrequested-mailsfrinat.de
Tel +49 761 208 999 63

Dr. Robert Brinkmann
brinkmann(at)avoid-unrequested-mailsfrinat.de

Funding authority

Federal Agency for Nature Conservation (BfN)
II 1.1 Zoological species protection

Ruth Petermann
Ruth.Petermann(at)avoid-unrequested-mailsBfN.de

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