Grazing and Fire: How Human Activity Reshapes the Southern Atlantic Forest

It is well established that human activity leads to biodiversity loss, but new research quantifies exactly how these disturbances reshape the subtropical Atlantic Forest. By utilising a robust database covering three forest formations and varying successional stages, scientists analysed the factors driving changes in species composition.

The study focused on beta-diversity—a term describing how species make-up varies between different locations. While the researchers found that overall diversity patterns were primarily explained by species richness (53.3%) and environmental factors like precipitation seasonality, anthropogenic factors played a notable role. Crucially, the specific human impact varied by ecosystem.

In Araucaria forests, the modelling showed that livestock grazing was a key predictor of diversity patterns. Conversely, in Evergreen Forests, fire frequency played a decisive role alongside elevation and temperature range. These variations suggest that distinct ecological histories dictate how a forest responds to stress. The findings highlight that conservation strategies cannot be uniform; they must be tailored to the specific anthropogenic, or human-caused, pressures affecting each forest type to ensure long-term resilience.