In 2013 they spotted something alarming [in broad-spectrum insect sampling].
When they returned to one of their earliest trapping sites from 1989, the
total mass of their catch had fallen by nearly 80%. Perhaps it was a
particularly bad year, they thought, so they set up the traps again in 2014.
The numbers were just as low. Through more direct comparisons, the
group-which had preserved thousands of samples over 3 decades-found dramatic
declines across more than a dozen other sites.

http://www.sciencemag.org/news/2017/05/where-have-all-insects-gone
http://tinyurl.com/m5hkw9m

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