KEY TAKEAWAYS
AWWIC has sufficient data, with enough geographic coverage, for investigators to pose reasonable hypotheses about the impacts of wind energy on bat species in the U.S. These hypotheses can be re-evaluated as data from additional PCM studies are added to AWWIC.
Findings indicate substantial variation in collision risk among bat species with most fatalities concentrated among a few species. Three species of migratory tree bat accounted for 72% of all bat fatality incidents in AWWIC, and the eight bat species with the highest number of fatalities accounted for 96% of all fatality incidents.
Species composition of fatalities and adjusted fatality estimates vary substantially across geographic regions. Evaluation of this variation may improve our knowledge of why some bats in some regions have apparent high collision risk.
Accurate cumulative assessments of wind energy’s impacts on bats need to account for the geographic variation in numbers and variation among species in collision fatalities.
Findings indicate substantial variation in collision risk among bat species with most fatalities concentrated among a few species. Three species of migratory tree bat accounted for 72% of all bat fatality incidents in AWWIC, and the eight bat species with the highest number of fatalities accounted for 96% of all fatality incidents.
Species composition of fatalities and adjusted fatality estimates vary substantially across geographic regions. Evaluation of this variation may improve our knowledge of why some bats in some regions have apparent high collision risk.
Accurate cumulative assessments of wind energy’s impacts on bats need to account for the geographic variation in numbers and variation among species in collision fatalities.
- American Wind Wildlife Institute (AWWI). 2020. Summary of Bat Fatality Monitoring Data Contained in AWWIC (2nd Edition). Washington, DC. [PDF]
- American Wind Wildlife Institute (AWWI). 2020. AWWI Technical Report: 2nd Edition: Summary of Bat Fatality Monitoring Data Contained in AWWIC. Washington, DC. [PDF]
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