"Eva Knop’s team from the Institute of Ecology and Evolution at the University of Bern, shows for the first time, that nocturnal pollinators can be affected by artificial light leading to a disruption of the pollination service they provide. “So far, nocturnal pollinators have been largely neglected in the discussion of the worldwide known pollinator crisis”... The study has now been published in the magazine “Nature”...Additional information here. The Nature abstract is here.
The team investigated a total of 100 cabbage thistles, which were growing on five meadows experimentally illuminated with LED street lamps, and five meadows without artificial light. The illuminated plants were visited much more rarely by pollinating insects at night, than the unlit plants. The decline in pollinators had a significant influence on the reproduction of the cabbage thistles: at the end of the test phase, the average number of fruits per plants was around 13% lower. “The pollination during the day obviously cannot compensate for the losses in the night”, says Knop."