Night lighting swaps out moths for flies in mountain meadows
Lu N, Wang Y, Cai W, Chen Y, Yin L
Pollinators
The porch light or streetlamp you leave on doesn't just attract a few moths to your window, it can quietly rewrite which insects pollinate the flowers in your yard and favor less effective pollinators over specialists that evolved for the job.
Researchers set up lights at night in a high-altitude meadow on the Tibetan Plateau and watched what happened to the insects visiting flowers. Moths, the main nighttime pollinators, nearly stopped showing up, while flies moved in to fill some of the gap. Strangely, even daytime pollinators shifted their behavior too, with bees, moths, and beetles declining and flies increasing, showing that a few hours of artificial light can ripple through an entire ecosystem's pollination patterns, day and night.
Key Findings
Nocturnal Lepidoptera (mostly moths) visitation dropped 57.5% under artificial light, driving a 35.4% decline in total nighttime visits and a 64.7% drop in network nestedness
Diptera (flies) visitation rose 179.6% at night and 46.3% during the day, partially offsetting losses from other pollinator groups
Daytime effects emerged too: Hymenoptera, Lepidoptera, and Coleoptera visits fell by 20.0%, 51.8%, and 61.7% respectively, while network connectance rose 16.1%, even though total daytime visitation and plant community composition stayed unchanged
chevron_right Technical Summary
Artificial outdoor lighting at night scrambles who pollinates alpine flowers, cutting moth visits sharply while boosting flies, and these nighttime disruptions spill over to change daytime pollination too. Even without changing which plants grow there, light pollution rewires the whole web of pollinator relationships.
Abstract Preview
Original paper
Artificial Light at Night Alters Both of Nocturnal and Diurnal Pollination Networks in Alpine Meadows.
Artificial light at night (ALAN) is an increasingly pervasive driver of global change that disrupts natural diel rhythms and alters species interactions. However, its effects on plant-pollinator ne...
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