White LED light intensity, but not colour temperature, interferes with mate?finding by glow?worm (Lampyris noctiluca L.) males

Artificial light at night is an increasing threat to nocturnal biodiversity. Aside from the overall increase in emission, replacement of old monochromatic streetlighting by broad emission spectrum LED lights may be additional threat. Studies evaluating impacts these artificial on European common glow-worm (Lampyris noctiluca L.) are scarce. This study examines effects upward facing white mate seeking activity male glow-worms. Therefore we used traps with dummy females along a distance gradient different intensities and colour temperature (cold warm white) counted number males attracted per trap. We found that negatively impacted males’ ability locate females, previously unreported low levels, while did not affect outcomes. More research pollution their underlying mechanisms needed evaluate this emerging widespread mating success population persistence Our has important implications for conservation as showed lights, which increasingly large scale other outdoor lighting, have strong negative finding glow-worms, even levels. furthermore demonstrated does mitigate lowered attraction under light.