Female flashing at night declines under LEDs, study suggests
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BALTIMORE — The glow of LED lights might throw off the flirtations of fireflies, new tests suggest.
Females of the big dipper species (Photinus pyralis) don’t flash back at twinkling males quite as often as expected when forced to court under artificial light, says ecologist Ariel Firebaugh of the University of Virginia in Charlottesville. And these less flashy females didn’t end up mating. (In natural twilight, five out of 28 fireflies did.) Likewise, artificial light in the lab reduced female flash responses to a fake male (a Christmas tree bulb brightening in a male’s rhythm). Yet LED illumination outdoors didn’t seem to curtail males’ flirt-flashing. Light pollution may unsettle the female response, Firebaugh suggested August 11 at the annual meeting of the Ecological Society of America.
There have been few, if any, other experiments testing details of how artificial light at night affects fireflies’