Abstract
1. Recently documented insect declines have caused major concerns and an increased interest in studies using long‐term population‐monitoring data.2. Samples from a 12.2‐m suction trap were used to examine trends in phenology and abundance of Diptera over four decades.3. The timing of peak flight has advanced by an average of 17 days, from 23 July in 1974 to 6 July in 2014.4. The abundance of flies has decreased by 37% over the studied period (from April to September), and peak abundance has decreased by 48%. The flight period has started earlier in recent years, and in 2014, the number of flies was higher in spring until the 31st of May than in 1974. Possible causes and impacts of these changes are discussed.
Highlights
Studies suggest that there has been a recent decline in both the biomass (Hallmann et al, 2017; Macgregor et al, 2019) and diversity of insects (Seibold et al, 2019)
While most studies suggest that the overall effects of habitat loss and degradation, as well as of pesticide use, are negative, the effects that climate change can have on different organisms cannot be described so
Many organisms demonstrate substantial phenological trends over time, which are often attributed to climate change (Robinet & Roques, 2010)
Summary
Studies suggest that there has been a recent decline in both the biomass (Hallmann et al, 2017; Macgregor et al, 2019) and diversity of insects (Seibold et al, 2019). Multiple reasons for this have been proposed, but the main causes are likely to be habitat loss and degradation, environmental toxins, and climate change (Wagner, 2020). While most studies suggest that the overall effects of habitat loss and degradation, as well as of pesticide use, are negative, the effects that climate change can have on different organisms cannot be described so .
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