Fireflies or lightning bugs are soft-bellied beetles known widely for their use of bioluminescence – the biochemical emission of light – to communicate and to attract mates.  There are more than 2,000 species of these beetles globally.  They can be found in temperate and tropical climates, like marshes or wet, wooded areas, all throughout the world.   

But if you are seeing fewer fireflies each summer, you’re not

alone.  Like many insects, firefly

populations are under duress from threats like pesticides, pollution, and

habitat loss.  But fireflies are also

facing another threat unique to luminous bugs: light pollution.  Light pollution is making it harder for

fireflies to reproduce because the artificial light is outshining their mating

signals. 

Male fireflies light up to signal availability and female fireflies

respond with patterned flashes to indicate they’re interested.  But artificial bright light from things like

billboards, streetlights, buildings, and homes, is interfering with the

fireflies reproduction communications. 

The study, by researchers at Tufts University and the IUCN, warned that these threats facing fireflies could lead them globally to extinction. 

The researchers also point to habitat loss as another major threat to

fireflies.  Firefly populations are

especially vulnerable because they need special conditions to complete their

life cycle.  Mangrove forests and marshes

around the world are being removed in favor of cash crops like palm oil.   

Insects like fireflies are crucial components of many ecosystems where

they perform important functions, like aerating soil, pollinating plants, and

controlling pests.  Firefly larvae feed

on snails, slugs and mites, and many fireflies are effective pollinators. 

We can’t afford for fireflies to go dark. 

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Web Links

A Global Perspective on Firefly Extinction Threats

Fireflies Have a Mating Problem: The Lights Are Always On

Photo, posted June 5, 2010, courtesy of Matt MacGillivray via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.