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. 2008 Apr 21;105(16):6087–6090. doi: 10.1073/pnas.0704801105

Fig. 1.

Fig. 1.

Relationship between aboveground net primary production (ANPP) (a), biodiversity effect (b), complementarity effect (c), and selection effect and plant species richness (d) in the Patagonian steppe. During 3 years from 2003 to 2005 ANPP, the biodiversity (21) and complementarity (21) effects increased linearly with observed plant species richness, whereas the selection effect (21) remained constant. We estimated the biodiversity effect for a mixture as the difference between observed and expected ANPP (the yield in monoculture weighted by the initial proportion of species in the mixture), using the equation proposed by Loreau and Hector (21). We unpacked the biodiversity effect by calculating its two components, selection and complementarity effects. Each point represents the average of an assemblage, and lines represent best fit. In all cases, the assemblage term was not significant. See Table 1 for statistical analysis. ‡, P < 0.07; *, P < 0.05; **, P < 0.01; ***, P < 0.001; ns, P > 0.1.