Figure 2.

(a) Inter-annual dynamics of forb richness (number of forb species per 0.25 m² plot), shown as GLM-derived treatment means (±1 s.e.) for each year. Blue symbols and lines represent ambient means; green symbols and lines represent warmed means, whereas open symbols represent grazed means and closed symbols represent exclosed means. EA, exclosed, ambient; EW, exclosed, warmed; GA, grazed, ambient; GW, grazed, warmed. (b) Relationship between stability, defined as the inverse of the coefficient of variation (CV) of peak biomass indexed by point-frame pin hits per 0.25 m² plot across the past 7 years of the experiment, and diversity (number of forb species per 0.25 m² plot) within the forb component of the community, from 2005 to 2011. Because analyses were performed on the CV of biomass, indexed by point-frame sampling, rather than on the inverse of the CV, the y-axis is reversed to illustrate increasing stability (i.e. smaller CV values) upwards along the axis.