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Providing evidence to improve practice

Individual study: Street lighting disturbs commuting bats

Published source details

Stone E.L., Jones G. & Harris S. (2009) Street lighting disturbs commuting bats. Conservation Biology, 19, 1123-1127

This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Avoid illumination of bat commuting routes Bat Conservation

A replicated, controlled study in 2008 along eight hedgerows in the south of the UK (Stone et al 2009) found that unlit hedges had higher activity of lesser horseshoe bats Rhinolophus hipposideros, and bats were active earlier in the evening, than along hedges illuminated with streetlights. Unlit hedges had significantly higher lesser horseshoe bat activity (average 79 bat passes) than hedges illuminated with streetlights (average 7–10 bat passes). Lesser horseshoe bats were also active significantly earlier on nights when hedges were unlit (average 30 minutes after sunset) than on nights when they were illuminated with streetlights (79 minutes after sunset). Each of eight hedges was illuminated with two portable high pressure sodium streetlights (average 53 lux). In April–July 2008, observations and bat detector recordings were made for seven nights at each of eight sites with a silent unlit control treatment for one night, a noise treatment on the second night (with the generator powering the lights), four nights with the lit treatment and a final night with a repeat of the noise treatment.

(Summarised by Anna Berthinussen)