Moths in cities have learned to avoid man-made light
The globally increasing light pollution has negative effects on organisms and entire ecosystems. The consequences are especially hard on nocturnal insects, since their attraction to artificial light sources generally ends fatal. A new study by Swiss zoologists from the Universities of Basel and Zurich now shows that urban moths have learned to avoid light. The journal Biology Letters has published their results.
Some insects are attracted by light while others shy away from it. Proverbial is the attraction light has on moths. Street lamps and other artificial light sources often become death traps for nocturnal insects such as moths. Either they die through direct burning or through increased exposure to predators. Mortality of urban insects can thus be 40- to 100- fold higher than in rural populations.
Artificial light affects the ecosystem of insects by interfering with their natural day-night cycle and influencing behavior patterns such as feeding and reproduction. Swiss Zoologists have now studied whether moths in the Basel region have already evolutionary adapted to the changed light conditions.
City moths are less attracted to light
Under the assumption that natural selection would favor moths with less propensity to fly to light in urban areas, the researchers examined the small ermine moth Yponomeuta cagnagella. For the experiment they collected larvae in the Basel region in areas with low light pollution such as the village Kleinlützel and in areas which have been exposed to heavy light pollution, such as Allschwil or Basel City.
Moths at light bulb image via Shutterstock.
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