translate English to French: An interaction that has more than additive effects, such as the joint toxicity of two compounds being greater than their combined independent toxicities (Meffe et al. 1994).
ThÃ©orie et mÃ©thode de contrÃ´le de l'Ã©tablissement, de la composition, de la croissance et de la qualitÃ© des peuplements forestiers en vue d'atteindre certains objectifs d'amÃ©nagement (Ressources naturelles Canada, 1994).