Journal Article Atacama Desert Research Support, Non-U.S. Gov't DNA, Ancient Maihueniopsis camachoi Research Support, U.S. Gov't, Non-P.H.S. adaptation ancient DNA biodiversity biogeography climate change convergent mechanisms desert plants eco-metabolomics elevational gradients enrichment analysis extreme ecosystems extreme environments facilitation fossil middens machine learning metabarcoding metabolism multi-species multiple species paleoecology plant metabolism plants positive interactions predictive metabolomics