Scientist Brad Lister returned to Puerto Rican rainforest after 35 years to find 98% of ground insects had vanished. A “bottom-up trophic cascade”, in which the knock-on effects of the insect collapse surge up through the food chain.
“I don’t think most people have a systems view of the natural world,” Lister said. “But it’s all connected and when the invertebrates are declining the entire food web is going to suffer and degrade. It is a system-wide effect.”
To understand the global scale of an insect collapse that has so far only been glimpsed, Lister says, there is an urgent need for much more research in many more habitats. “More data, that is my mantra,” he said.
The problem is that there were very few studies of insect numbers in past decades to serve as a baseline, but Lister is undeterred: “There’s no time like the present to start asking what’s going on.”