This project was conducted during 2008. We used an experimental approach to test the impact of HPS lights on bat commuting behaviour along hedgerows
within the vicinity of lesser horseshoe bat (Rhinolophus hipposideros) roosts. Lesser horseshoe bats use hedgerows and other linear
landscape features as commuting routes to travel through the landscape to reach foraging areas. Connectivity of such features within the
landscape is therefore important for this species. Flight paths awere identified using AnaBat II and SD1 ultrasonic detectors
(Titley Electronics, Ballina, New South Wales, Australia) which record relative bat activity and species diversity. Hedges were then illuminated
using two portable street lights to test for changes in species diversity and activity before and after illumination.Our street lights have been
obtained under guidance from the Institution for Lighting Professionals (ILP) to ensure that they closely
match those used on the streets.
We found that HPS lights caused a significant reduction in the commuting activity of lesser horseshoe bats, causing avoidance behaviour.
The results of this study were published in Current Biology (2009). You can find a link to the
paper on our publications page.