Figure 4. Proportion of species whose distributions are shaped by limited (‘dispersal limitation’, dark red data), sufficient (‘species sorting’, gray data), or excess (‘sink populations’, light blue data) dispersal across the productivity gradient, as communities are connected by dispersal to form a larger metacommunity. Data shown separately for the (A) ‘with neighbors’ and (B) ‘without neighbors’ treatments, respectively. Dispersal outcomes of species are categorized as follows: ‘dispersal limitation’ occurs when species can persist but are absent from a location, ‘species sorting’ is when a species is present where it can persist or is absent where it cannot persist, and ‘sink populations’ are when species cannot persist at the current population size, but are present. 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.