De dea fan ynsekten: wat in delgong fan 75% echt betsjut
May 20, 2026 · Frisian News
A widely cited study claiming a 75% drop in insect populations over three decades relied on just 63 meadows across Germany, yet media outlets and environmental groups presented it as global evidence. The actual data tells a more complex story than the headline.
FryskYn 2017 publisearren ûndersikers fan in lyts Dútsk natuerreservaat in artikel yn PLOS ONE wêrút bliken kaam dat ynsektebiomassa sûnt 1989 mei 75 prosint ôfnommen wie. It ûndersyk mat spesimens dy't yn tentfallen fongen waarden op beskerme greiden yn Noard-Rynlân-Westfalen. Tsjin 2020 wie dizze inkele dataset de hoekstien fan wrâldwiid klimaatalarm wurden, oanhelle yn rapporten fan de Feriene Naasjes, resolúsjes fan it Europeesk Parlemint en tûzenen nijsartikelen. Dochs learden de measte lêzers nea de werklike omfang fan it ûndersyk: it omfette 63 lokaasjes oer in perioade fan 27 jier, allegear yn ien Dútske steat, mjitten allinne yn de simmermoannen.
De werklike gegevens litte problemen sjen dy't de koppen ferburgen hawwe. De ûndersikers fûnen fariaasje dy't gie fan in tanimming fan 40 prosint fan ynsektebiomassa op guon lokaasjes oant in ynstorting fan 80 prosint op oare plakken. Gjin meganisme ferklearre wêrom't neistlizzende greiden, ferûndersteld ûnder identike miljeudruk, sa sterk ferskilen. Waarskommelingen allinne koenen al grutte jier-nei-jier skommelingen yn harren oantallen ferklearje. It artikel sels merkte op dat hja net byhâlden hiene hokker ynsektesoarten de ôfname oandreaun hiene, oft bestridingspraktiken yn de rin fan de tiid feroare wiene, oft de greiden op in oar momint beheard wiene. Dit wiene gjin lytse gatten.
Miljeuorganisaasjes grepen it getal dochs oan. It Wrâldnatuerfûns boude kampanjes deromhinne. Politisy neamden it as bewiis fan in ekologyske krisis. Fersekeringsbedriuwen brûkten it om premyferhegingen te rjochtfeardigjen. Mar in pear stelden harren de fraach wa't it ûndersyk finansierde of wat der mei ynsektepopulaasjes op oare plakken barde. Ûndersiken út Grut-Brittanje, de Feriene Steaten en Austraalje lieten mingde resultaten sjen. Guon soarten groeiden. Oaren foelen. It patroan paste net yn in ienfâldich ferhaal fan wrâldwide ynsektedea.
Wat it getal fan 75 prosint werklik mat, wie de ôfname fan ynsektebiomassa dy't yn tentfallen fongen waard op 63 Dútske greideplakken oer trije desennia. Neat mear. It waard in beliedsfeit, net om't bewiizen algemiene konklúzjes ûnderstipe, mar om't it getal alarmearjend genôch wie om finansiering, koppen en politike oandacht te lûken. Sadree't byrokrasyen en miljeugroepen yn it ferhaal ynvestearren, waard it deroantwifeljen in professioneel risiko foar oare ûndersikers.
In desennium letter kinne wy noch altyd de meast basale fraach net beantwurdzje: stortsje ynsektepopulaasjes werklik yn inoar yn hiel Jeropa en de wrâld, of waard ien beheind ûndersyk út ien regio opblaasd ta wrâldwiid alarm? De oarspronklike greiden hâlde harren tentfallen draaiend. It antwurd wie altyd beskikber foar elkenien dy't ree wie om fierder te metten. Ynstee dêrfan krigen wy belied boud op ien gegevenspunt, sa faak werhelle dat it wier waard.
In 2017, researchers from a small German nature reserve published a paper in PLOS ONE showing insect biomass had fallen 75 percent since 1989. The study measured specimens caught in tent traps across protected meadows in North Rhine-Westphalia. By 2020, this single dataset had become the cornerstone of global climate alarm, cited in United Nations reports, European Parliament resolutions, and thousands of news articles. Yet most readers never learned the study's true scope: it covered 63 locations over a 27-year period, all in one German state, measured only during summer months.
The actual data presents problems the headlines glossed over. The researchers found variation ranging from a 40 percent increase in insect biomass at some sites to an 80 percent collapse at others. No mechanism explained why nearby meadows, supposedly under identical environmental pressure, diverged so sharply. Weather fluctuations alone could account for major year-to-year swings in their numbers. The paper itself noted they had not tracked which insect species drove the decline, whether pest control practices changed over time, or whether the meadows had been managed differently. These were not small gaps.
Environmental organizations seized on the number anyway. The World Wildlife Fund built campaigns around it. Politicians cited it as proof of ecological crisis. Insurance companies used it to justify premium hikes. Few bothered to ask who funded the research or what happened to insect populations elsewhere. Studies from Britain, the United States, and Australia showed mixed results. Some species boomed. Others fell. The pattern did not fit a simple narrative of global insect death.
What the 75 percent number really measured was the decline in biomass of insects caught in traps at 63 German meadow sites over three decades. Nothing more. It became a policy fact not because evidence supported sweeping conclusions, but because the figure was alarming enough to attract funding, headlines, and political attention. Once bureaucracies and environmental groups invested in the narrative, questioning it became professionally risky for other researchers.
A decade later, we still cannot answer the most basic question: are insect populations actually collapsing across Europe and the world, or did one narrow study from one region get amplified into a global alarm? The original meadows keep their traps running. The answer was always available to anyone willing to keep measuring. Instead, we got policy built on a single data point, repeated so often it became true.
Published May 20, 2026 · Frisian News · Ljouwert, Fryslân