The Alarming Case of the Missing Insects – Repeating Islands
Their findings were alarming: Compared with the 1970s, the surveys from 2011 to 2013 turned up 98 percent less insect biomass in ground traps, 83 percent less in sweep nets, and 65 percent less in canopy traps. The scientists also found close to 60 percent less anoles, a diverse family of lizards that eat insects.
The debate is about the cause(s), not the actual numbers of insects in the rain forests of Puerto Rico. There are documented drops of insect numbers that are very similar all around the world, so this is not an isolated incident, nor are the long term drops in numbers due to hurricanes.