The evolutionary assembly of forest communities along environmental gradients: recent diversification or sorting of pre-adapted clades? [article]

Alexander G. Linan, Jonathan A. Myers, Christine E. Edwards, Amy E. Zanne, Stephen A. Smith, Gabriel Arellano, Leslie Cayola, William Farfan-Rios, Alfredo F. Fuentes, Karina Garcia-Cabrera, Sebastián Gonzales-Caro, Maria Isabel Loza (+6 others)
2020 bioRxiv   pre-print
Historical biogeographic events such as mountain orogeny are associated with the creation of environmental gradients, giving rise to the assembly of communities of species observed today. However, key gaps remain in our understanding of the relative importance of different eco-evolutionary processes acting as drivers of community assembly across environmental gradients. In this study, we test two non-exclusive hypotheses of the eco-evolutionary processes that shape tree communities across the
more » ... nities across the Central Andean elevational gradient: Communities are assembled via 1) immigration and ecological sorting of pre-adapted clades, and 2) recent adaptive diversification along the elevational gradient. We used species surveys in the Bolivian and Peruvian Andes and a novel phylogenetic framework to test the relative importance of these hypotheses. Although adaptive diversification has previously been observed in specific clades, immigration and sorting of clades pre-adapted to montane habitats is the primary mechanism shaping communities across elevations.
doi:10.1101/2020.12.22.424032 fatcat:u7cvxr7rr5dl7l3egh6ogh6jle