Insects react sensitively when temperature and precipitation deviate from the long-term average. In an unusually dry and warm winter, their survival probabilities are reduced; in a wet and cold spring, hatching success is impaired. A cool, wet summer hampers bumblebees and other flying insects to reproduce and forage.
and accumulations of unfavorable weather anomalies in the course of climate change can be important drivers of global insect decline. Only insect populations with a large number of individuals, as found in sufficiently large and high-quality habitats, appear to be able to survive under such adverse conditions.report plead for more high-quality habitats. These are characterized by plants that are typical of near-natural habitats, by high structural richness or extensive use.
The study that caused the biggest stir came from a group led by Dutch researcher Caspar A. Hallmann in 2017, in which data from the Krefeld Entomological Association was analyzed. The study revealed that the insect biomass in German nature reserves decreased by more than 75% between 1989 and 2016. The first task was to clarify whether there was actually much more insect biomass than usual in 2022. This was confirmed."We found a biomass that was almost as high on average as the maximum values from the Hallmann study. And our 2022 maximum was higher than all values Hallmann had ever determined—this value, by the way, comes from the forest of the University of Würzburg," says the JMU professor.
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