Beta diversity patterns in Andean rodents: current and historical factors as drivers of turnover and nestedness.

This article focuses on the spatial patterns and drivers of rodent beta diversity along the Andes Mountains, a region known for its high species richness and complex geological history. Using geographic range data for 432 rodent species, the study analyzes beta diversity components—turnover (species replacement) and nestedness (species loss)—across three Andean segments: Northern Andes, Central Andes, and Southern Andes. Results show that beta diversity decreases from north to south, with turnover dominating overall but nestedness contributing significantly in the Southern Andes, likely due to historical glaciation effects. The study finds that spatial factors primarily explain beta diversity patterns, with varying contributions from climate and historical processes across segments, reflecting the Andes' orogenic history and environmental heterogeneity.