Table 1.

Effects of the strength of the within-species and between-species foraging responses (root length, root diameter, root biomass, specific root length) on the ln-transformed plant biomass.

Foraging trait	Among species		Within species
	Estimate (± s.e.)	P-value	Estimate (± s.e.)	P-value
Root length	2.45 (1.04)	0.020	0.62 (0.32)	0.054
Root diameter	5.64 (7.68)	0.464	4.39 (1.75)	0.013
Root biomass	2.01 (0.87)	0.023	−0.20 (0.34)	0.553
Specific root length	−0.93 (2.03)	0.646	0.79 (0.25)	0.002

Presented are the fixed effects estimates of linear mixed effects models, the associated standard errors and p-values of the among-species and within-species effects. The scaled start size of the plants was used as a model covariable; species identity was used as a random factor. Significant results are in bold. Positive estimates indicate a positive effect of root foraging on performance.