R Script and Data for Propagules, disturbance lower invasibility - revision

We manipulated soil disturbance and propagule pressure in three habitat types (aspen forest, shrub vegetation, prairie grassland) and examined their impact on the germination success of three pairs of phylogenetically similar native and non-native plant species (Bromus ciliatus/B. inermis, Elymus trachycaulus/Agropyron cristatum, Poa secunda/P. pratensis) for three months after seed addition.