Three-quarters of flying insects in nature reserves across Germany have vanished in 25 years, with serious implications for all life on Earth, scientists say
The abundance of flying insects has plunged by three-quarters over the past 25 years, according to a new study that has shocked scientists.
Insects are an integral part of life on Earth as both pollinators and prey for other wildlife and it was known that some species such as butterflies were declining. But the newly revealed scale of the losses to all insects has prompted warnings that the world is on course for ecological Armageddon, with profound impacts on human society.
The new data was gathered in nature reserves across Germany but has implications for all landscapes dominated by agriculture, the researchers said.
The cause of the huge decline is as yet unclear, although the destruction of wild areas and widespread use of pesticides are the most likely factors and climate change may play a role. The scientists were able to rule out weather and changes to landscape in the reserves as causes, but data on pesticide levels has not been collected.
The fact that the number of flying insects is decreasing at such a high rate in such a large area is an alarming discovery, said Hans de Kroon, at Radboud University in the Netherlands and who led the new research.
Insects make up about two-thirds of all life on Earth [but] there has been some kind of horrific decline, said Prof Dave Goulson of Sussex University, UK, and part of the team behind the new study. We appear to be making vast tracts of land inhospitable to most forms of life, and are currently on course for ecological Armageddon. If we lose the insects then everything is going to collapse.
The research, published in the journal Plos One, is based on the work of dozens of amateur entomologists across Germany who began using strictly standardised ways of collecting insects in 1989. Special tents called malaise traps were used to capture more than 1,500 samples of all flying insects at 63 different nature reserves.