Quantcast
Environmental News for a Healthier Planet and Life

Help Support EcoWatch

Insect Populations on Land Are Down 25%, Study Shows

Science
A red admiral butterfly stands on a flower in an urban garden in the city center on August 9, 2018 in Berlin, Germany. Sean Gallup / Getty Images

If you haven't noticed as many bees, butterflies and fireflies as you used to, there's a good reason for that.


It turns out that insects that live on land have seen their population decline 9 percent every decade, which means we have lost nearly one-fourth of them over the last 30 years and 50 percent of them over the last 75 years, according to a new analysis published in Science, as Newsweek reported.

"And because it's a mean, there are places where it is much worse than that," Dr. Roel van Klink, an ecologist at the German Center for Integrative Biodiversity Research, told the BBC.

"Insect declines happen in a quiet way and we don't take notice from one year to the next. It's like going back to the place where you grew up. It's only because you haven't been there for years that you suddenly realize how much has changed, and all too often not for the better," added van Klink from the Newsweek story.

The losses were strongest in the West and Midwest in the U.S. and in Europe, especially in Germany, according to the BBC.

The analysis looked at 166 long-term surveys from almost 1,700 sites between 1925 and 2018. It found that some insects were not following the trend. In fact, freshwater insects like mosquitoes and midges were increasing their numbers by about 11 percent per decade, which is likely due to conservation efforts to clean up polluted rivers and lakes. However, as The Guardian noted, these bugs make up only 10 percent of insect species and do not pollinate crops.

"Insect populations are like logs of wood that are pushed under water. They want to come up, while we keep pushing them further down. But we can reduce the pressure so they can rise again," said van Klink in a CNN report. "The freshwater insects have shown us this is possible. It's just not always easy to identify the causes of declines, and thus the most effective measures to reverse them. And these may also differ between locations."

The researchers said the study is by no means complete, and there is an urgent need to accelerate the study of insect populations to paint a clearer picture. The rapid decline of insects worldwide has concerned scientists. Insects are among the most abundant and diverse species on the planet. They serve vital functions in preserving ecosystems, from aerating the soil to pollination and recycling of nutrients, the BBC reported.

The researchers would like to see data from understudied areas like South America, South Asia and Africa, where there is virtually none. They said that the rapid destruction of wild habitats in these places for farming and urbanization is likely to have drastically reduced insect populations, according to The Guardian.

Professor Dave Goulson from the University of Sussex, who was not involved in the new analysis, told The Guardian, "People should be as concerned as ever about insects. It is great news that some aquatic insects seem to be increasing, probably from a very low level. But the bulk of insects are terrestrial and this new study confirms what was already clear: they have been declining for many decades."

The researchers do not take much heart from the increase in freshwater insect populations.

"The area of freshwater we have on earth is just a small percentage of the total land mass, so the numbers of freshwater insects will never be able to compensate for the terrestrial insects," van Klink related to the BBC.


EcoWatch Daily Newsletter

Mourners after a mass burial of coronavirus victims in Brazil, which now has the world's second largest outbreak after the U.S. Andre Coelho / Getty Images

The total number of confirmed coronavirus cases passed six million Sunday, even as many countries begin to emerge from strict lockdowns.

Read More Show Less
Pexels

By Daniel Yetman

Bleach and vinegar are common household cleaners used to disinfect surfaces, cut through grime, and get rid of stains. Even though many people have both these cleaners in their homes, mixing them together is potentially dangerous and should be avoided.

Read More Show Less
During a protest action on May 30 in North Rhine-Westphalia, Datteln in front of the site of the Datteln 4 coal-fired power plant, Greenpeace activists projected the lettering: "Climate crisis - Made in Germany" onto the cooling tower. Guido Kirchner / picture alliance / Getty Images

Around 500 climate activists on Saturday gathered outside the new Datteln 4 coal power plant in Germany's Ruhr region, to protest against its opening.

Read More Show Less
Dr. Mark Brunswick (2R), Vice President of Regulatory Affairs and Quality, walks through the lab at Sorrento Therapeutics in San Diego, California on May 22. ARIANA DREHSLER / AFP / Getty Images

By Julia Ries

Around the world, there have been several cases of people recovering from COVID-19 only to later test positive again and appear to have another infection.

Read More Show Less

By Samantha Hepburn

In the expansion of its iron ore mine in Western Pilbara, Rio Tinto blasted the Juukan Gorge 1 and 2 — Aboriginal rock shelters dating back 46,000 years. These sites had deep historical and cultural significance.

Read More Show Less
Meadow Lake wind farm in Indiana. Anthony / CC BY-ND 2.0

By Tara Lohan

The first official tallies are in: Coronavirus-related shutdowns helped slash daily global emissions of carbon dioxide by 14 percent in April. But the drop won't last, and experts estimate that annual emissions of the greenhouse gas are likely to fall only about 7 percent this year.

Read More Show Less

Trending

Andrey Nikitin / iStock / Getty Images Plus

By Adrienne Santos-Longhurst

Plants are awesome. They brighten up your space and give you a living thing you can talk to when there are no humans in sight.

Turns out, having enough of the right plants can also add moisture (aka humidify) indoor air, which can have a ton of health benefits.

Read More Show Less