Summary of linear regression models to analyse 1. metabolic activity, 2. non-transgressive overyielding, and 3. transgressive overyielding.

The models were designed to investigate effects of species richness, species composition and substrate richness on metabolic activity, and species richness, substrate richness and substrate composition on non-transgressive and transgressive overyielding over time, respectively. SR: species richness, T: time, SUBR: substrate richness, SC: species composition, SUBC: substrate composition. L: L-value, d.f.: degrees of freedom.