Aim. Climate is usually regarded as the main determinant of plant species’ distributions. However, past human use of species for food also may have influenced distributions. We hypothesized that human-mediated dispersal has resulted in food plants occupying more of their potential geographic range. We also hypothesized that key ecological traits could predispose a species to occupy more of its potential climatic geographic range and be selected by humans for food. Location. The Sonoran Desert of southwestern North America. Time period. Present day. Major taxa studied. Food plants. Methods. We used ethnobotanical and data from large botanical ecoinformatics databases to estimate realized (dispersal- and climate-constrained) and potential (climate-constrained) ranges for food plants and their used and un-used congeners. Results. We found that food plants fill more of their potential geographic ranges than their un-used congeners. We also found that succulence and annual growth interacted with food usage to increase range filling. Main conclusions. Human food use has expanded the distribution of many plant species in the Sonoran Desert.
|Date made available
|May 3 2021