Figure 3. Proportion of species along the productivity gradient found to persist in the presence (light blue data) vs absence (dark purple data) of neighbors. Neighbors have an overall facilitative effect when the blue line is above the purple line and a competitive effect when the purple line is above the blue line. Productivity is represented by a green-red vegetation index, where less productive sites are towards the left. Proportions are based on a maximum number of four species (the number of focal species used in our experiment). Points are the raw data jittered for interpretability, lines and 95% confidence bands are fitted from our models. These data were fit to a model that also included data on persistence in the absence of neighbors, presented separately (Fig. 2) to streamline interpretation; the blue data is common to both figures.