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A European starling takes a look at things from its perch in the Netherlands. (Photo: Bas Kers (NL)/cc/flickr)

A European starling takes a look at things from its perch in the Netherlands. (Photo: Bas Kers (NL)/cc/flickr)

'Alarm Bells Are On': New Study Links Neonics to Bird Declines

New study finds scope of ecological damage caused by widely used insecticides worse than thought

Andrea Germanos

A class of insecticides linked to the decline of bees may be even more ecologically damaging than previously thought, possibly causing declines in birds as well.

The new findings by researchers from the Netherlands were published Wednesday in the journal Nature.

The researchers looked at one neonicotinoid or "neonic" called imidacloprid, and found that where the concentrations of that insecticide were more than 20 nanograms per liter, bird populations dropped by 3.5 per cent on average annually.

"In ten years it's a 35% reduction in the local population, it's really huge," study co-author Hans de Kroon from Radboud University told BBC News. "It means the alarm bells are on straight away."

The scientists suspect that the imidacloprid builds up and can persist for years in the soil, killing insects that the birds depend on for food, therefore leading to their decline.

"Our results suggest that the impact of neonicotinoids on the natural environment is even more substantial than has recently been reported and is reminiscent of the effects of persistent insecticides in the past," the study reads.

The new study comes on the heels of an analysis by a global team of scientists which found "clear evidence" that neonics—the most widely used insecticides in the world—pose threats to bees, other pollinators, earthworms and ecosystems across the globe.

"Our study really makes the evidence complete that something is going on here," de Kroon told the Guardian. "We can’t go on like this any more. It has to stop."

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