Fig. 1. Distribution and species genome size range for each of the transect sites. (a) Geographic distribution of the 3200-km (52 study sites, blue points) along the climatic gradient in the grasslands of northern China. Duolun station, where we conducted our 10-yr resources manipulation experiment, was indicated by red point. (b) Range of genome size for the species that occurred for each study site along the transect. Blue points indicate the species that have the maximum genome size while red points indicate the minimum one.