Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Insects: Largest study to date confirms declines on land, but finds recoveries in freshwater – Highly variable trends


A worldwide compilation of long-term insect abundance studies shows that the number of land-dwelling insects is in decline. On average, there is a global decrease of 0.92% per year, which translates to approximately 24% over 30 years. At the same time, the number of insects living in freshwater has increased on average by 1.08% each year.

Despite these overall averages, local trends are highly variable. These are the results from the largest study of insect change to date, now published in the journal Science. The study was led by researchers from the German Centre for Integrative Biodiversity Research (iDiv), Leipzig University (UL) and Martin Luther University Halle-Wittenberg (MLU).

Over the past few years, a number of studies have been published that show dramatic declines in insect numbers through time. The most prominent, from nature reserves in Western Germany, suggested remarkable declines of flying insect biomass (>75% decrease over 27 years).

This was published in 2017 and sparked a media storm suggesting a widespread “insect apocalypse”. Since then, there have been several follow-up publications from different places across the world, most showing strong declines, others less so, and some even showing increases.

But so far, no one has combined the available data on insect abundance trends across the globe to investigate just how widespread and severe insect declines are. Until now.

Largest data compilation to date

An international team of scientists collaborated to compile data from 166 long-term surveys performed at 1676 sites worldwide, between 1925 and 2018, to investigate trends in insect abundances (number of individuals, not species). The complex analysis revealed a high variation in trends, even among nearby sites.

For example, in countries where many insect surveys have taken place, such as Germany, the UK and the US, some places experienced declines while others quite close by indicated no changes, or even increases.

However, when all of the trends across the world were combined, the researchers were able to estimate how total insect abundances were changing on average across time.

They found that for terrestrial insects (insects that spend their whole lives on land, like butterflies, grasshoppers and ants), there was an average decrease of 0.92% per year.

Insects disappear quietly

First author Dr Roel van Klink, a scientist at iDiv and UL, said: “0.92% may not sound like much, but in fact it means 24% fewer insects in 30 years’ time and 50% fewer over 75 years. 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 realise how much has changed, and all too often not for the better.”

Insect declines were strongest in some parts of the US (West and Midwest) and in Europe, particularly in Germany. For Europe in general, trends became on average more negative over time, with the strongest declines since 2005.

Fewer insects in the air

When reporting about “insect decline”, the mass media have often referred to the “windscreen phenomenon”: people’s perception that there are fewer insects being splattered on the windscreens of their cars now compared to some decades ago. The new study confirms this observation, at least on average.

Last author Jonathan Chase, professor at iDiv and MLU, said: “Many insects can fly, and it’s those that get smashed by car windshields. Our analysis shows that flying insects have indeed decreased on average. However, the majority of insects are less conspicuous and live out of sight – in the soil, in tree canopies or in the water.”

For the new study, the researchers also analysed data from many of these hidden habitats. This showed that on average, there are fewer insects living in the grass and on the ground today than in the past – similar to the flying insects. By contrast, the number of insects living in tree canopies has, on average, remained largely unchanged.

Freshwater insects have recovered

At the same time, studies of insects that live (part of) their lives under water, like midges and mayflies, showed an average annual increase of 1.08%. This corresponds to a 38% increase over 30 years. This positive trend was particularly strong in Northern Europe, in the Western US, and since the early 1990s, in Russia. For Jonathan Chase this is a good sign.

He said: “These numbers show that we can reverse these negative trends. Over the past 50 years, several measures have been taken to clean up our polluted rivers and lakes in many places across the world. This may have allowed the recovery of many freshwater insect populations. It makes us hopeful that we can reverse the trend for populations that are currently declining.”

Roel van Klink added: “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. 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.”

No simple solutions

Ann Swengel, co-author of the study, has spent the last 34 years studying butterfly populations across hundreds of sites in Wisconsin and nearby states in the US. She stresses how complex the observed abundance trends are and what they mean for effective conservation management:

“We’ve seen so much decline, including on many protected sites. But we’ve also observed some sites where butterflies are continuing to do well. It takes lots of years and lots of data to understand both the failures and the successes, species by species and site by site. A lot is beyond the control of any one person, but the choices we each make in each individual site really do matter.”

Habitat destruction most likely causes insect declines

Although the scientists were unable to say for certain exactly why such trends – both negative and positive – emerged, they were able to point to a few possibilities. Most importantly, they found that destruction of natural habitats – particularly through urbanisation – is associated with the declines of terrestrial insects. Other reports, such as the IPBES Global Assessment, also noted that land-use change and habitat destruction are a main cause of global biodiversity change.

This new study was made possible by iDiv’s synthesis centre sDiv. It is currently the most comprehensive analysis of its kind. It depicts the global status of insects and shows where insect protection is most urgently needed.

Wissenschaftliche Ansprechpartner:

Dr Roel van Klink (speaks English, German and Dutch)
Postdoctoral researcher at iDiv’s synthesis centre sDiv
German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig
Phone: +49 1520 3117216

Prof Dr Jonathan Chase (speaks English)
German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig
Martin Luther University Halle-Wittenberg


Roel van Klink, Diana E. Bowler, Konstantin B. Gongalsky, Ann B. Swengel, Alessandro Gentile and Jonathan M. Chase (2020) Meta-analysis reveals declines in terrestrial but increases in freshwater insect abundances. Science, 368(6489)

Weitere Informationen:

Media release on dramatic decline in insect numbers in Western Germany, which is mentioned in this media release:

Global Assessment Report of the Intergovernmental Science-Policy Panel on Biodiversity and Ecosystem Services (IPBES), which is mentioned in this media release:

Volker Hahn | idw - Informationsdienst Wissenschaft

More articles from Studies and Analyses:

nachricht How to design city streets more fairly
18.05.2020 | Mercator Research Institute on Global Commons and Climate Change (MCC) gGmbH

nachricht Statistical method developed at TU Dresden allows the detection of higher order dependencies
07.02.2020 | Technische Universität Dresden

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Biotechnology: Triggered by light, a novel way to switch on an enzyme

In living cells, enzymes drive biochemical metabolic processes enabling reactions to take place efficiently. It is this very ability which allows them to be used as catalysts in biotechnology, for example to create chemical products such as pharmaceutics. Researchers now identified an enzyme that, when illuminated with blue light, becomes catalytically active and initiates a reaction that was previously unknown in enzymatics. The study was published in "Nature Communications".

Enzymes: they are the central drivers for biochemical metabolic processes in every living cell, enabling reactions to take place efficiently. It is this very...

Im Focus: New double-contrast technique picks up small tumors on MRI

Early detection of tumors is extremely important in treating cancer. A new technique developed by researchers at the University of California, Davis offers a significant advance in using magnetic resonance imaging to pick out even very small tumors from normal tissue. The work is published May 25 in the journal Nature Nanotechnology.

researchers at the University of California, Davis offers a significant advance in using magnetic resonance imaging to pick out even very small tumors from...

Im Focus: I-call - When microimplants communicate with each other / Innovation driver digitization - "Smart Health“

Microelectronics as a key technology enables numerous innovations in the field of intelligent medical technology. The Fraunhofer Institute for Biomedical Engineering IBMT coordinates the BMBF cooperative project "I-call" realizing the first electronic system for ultrasound-based, safe and interference-resistant data transmission between implants in the human body.

When microelectronic systems are used for medical applications, they have to meet high requirements in terms of biocompatibility, reliability, energy...

Im Focus: When predictions of theoretical chemists become reality

Thomas Heine, Professor of Theoretical Chemistry at TU Dresden, together with his team, first predicted a topological 2D polymer in 2019. Only one year later, an international team led by Italian researchers was able to synthesize these materials and experimentally prove their topological properties. For the renowned journal Nature Materials, this was the occasion to invite Thomas Heine to a News and Views article, which was published this week. Under the title "Making 2D Topological Polymers a reality" Prof. Heine describes how his theory became a reality.

Ultrathin materials are extremely interesting as building blocks for next generation nano electronic devices, as it is much easier to make circuits and other...

Im Focus: Rolling into the deep

Scientists took a leukocyte as the blueprint and developed a microrobot that has the size, shape and moving capabilities of a white blood cell. Simulating a blood vessel in a laboratory setting, they succeeded in magnetically navigating the ball-shaped microroller through this dynamic and dense environment. The drug-delivery vehicle withstood the simulated blood flow, pushing the developments in targeted drug delivery a step further: inside the body, there is no better access route to all tissues and organs than the circulatory system. A robot that could actually travel through this finely woven web would revolutionize the minimally-invasive treatment of illnesses.

A team of scientists from the Max Planck Institute for Intelligent Systems (MPI-IS) in Stuttgart invented a tiny microrobot that resembles a white blood cell...

All Focus news of the innovation-report >>>



Industry & Economy
Event News

Dresden Nexus Conference 2020: Same Time, Virtual Format, Registration Opened

19.05.2020 | Event News

Aachen Machine Tool Colloquium AWK'21 will take place on June 10 and 11, 2021

07.04.2020 | Event News

International Coral Reef Symposium in Bremen Postponed by a Year

06.04.2020 | Event News

Latest News

Algorithms, gold and holographic references boost biomolecule diffraction

27.05.2020 | Information Technology

Diabetes mellitus: A risk factor for early colorectal cancer

27.05.2020 | Health and Medicine

Ultra-thin fibres designed to protect nerves after brain surgery

27.05.2020 | Health and Medicine

Science & Research
Overview of more VideoLinks >>>