wow this would be a neat twist if true - we all defaulted to the negative explanation of having killed them all where a much more positive explanation might be that we're no longer luring them to their deaths at the leading edge of automobiles?
I guess it is most likely some combination of the above, but if there's any evidence it would be a neat reframing
Colorado: "Insect biomass declined by ∼47% and abundance declined by ∼61.5% over the last 35 years."
https://esajournals.onlinelibrary.wiley.com/doi/10.1002/ecs2...
Germany: "More than 75 percent decline over 27 years in total flying insect biomass in protected areas" https://journals.plos.org/plosone/article?id=10.1371/journal...
Puerto Rico: "dry weight biomass of arthropods captured in sweep samples had declined 4 to 8 times, and 30 to 60 times in sticky traps." https://www.pnas.org/doi/10.1073/pnas.1722477115