The methods they use to trap and count insects ( https://en.wikipedia.org//wiki/Malaise_trap https://en.wikipedia.org//wiki/Malaise_trap ) have been held consta

The methods they use to trap and count insects ( https://en.wikipedia.org//wiki/Malaise_trap https://en.wikipedia.org//wiki/Malaise_trap ) have been held constant for the last several decades, yet the decline continues ( https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0185809 https://journals.plos.org/plosone/article?id=10.1371/journal... ). I think it's to do with the predators that used to keep the grazers in check. They are fewer because we shot them in protection of or livestock. This lead to a swath of plant extinctions...