https://phys.org/news/2018-07-tropical-treetops-sensitive-species.html

"Tropical forests are among the most productive places on Earth—they account for about 30 percent of terrestrial productivity," said study author Stephanie Pau, an assistant professor in the Department of Geography. "These forests are vulnerable to climate change and climbing temperatures."

Tropical species like those in the canopies of Barro Colorado Island evolved to survive within a narrow range of equatorial temperatures, and are therefore hypothesized by scientists to be especially sensitive to minute temperature change.