Fig. 1.

Foliage net assimilation rate (a), stomatal conductance to water vapor (b) and intracellular CO₂ concentration per unit projected leaf area in Quercus robur plants in relation to the degree of damage by the larvae of the lymantriid moth Lymantria dispar (percentage of leaf area consumed). Data points correspond to averages of three replicate leaves in each individual plant (± SE). Data were fitted by linear (a) and non-linear regression in the form y = ab^x (b).