cross-posted from: https://slrpnk.net/post/34794749

• A team of researchers looked at changes in tree richness across the lowland and montane forests of the Andes and Amazon over the last four decades.
• While their results didn’t show an overall shift in any one direction, they found that tree richness changed significantly across the six subregions: forests in the central Andes, Guyana Shield and central-eastern Amazon have been losing species, while the northern Andes and western Amazon showed increased tree richness.
• Changes in the seasonality of precipitation, total rainfall, temperature, as well as the degree of forest fragmentation are key drivers for tree richness: forests that warmed more since 1971 lost species faster than those moderately warming; but regionally, precipitation plays a bigger role than temperature in richness changes.
• Forests with a higher number of trees and landscape integrity gain species, so limiting deforestation across the Andes–Amazon ecosystems can protect tree richness, in particular the northern Andes, which could serve as a key refuge for species that can no longer survive the warming Amazon.