Colette Ethier

Student Speaker | Étudiant.e
Herbivore defoliation has a major effect on temperate forest degradation, and it is important to have a good understanding of the damages it causes. Herbivore distribution and damages seen on leaves can be affected by various abiotic and environmental factors including vertical stratification. Considering that sugar maple dieback is a major concern in Quebec, more studies on vertical patterns of herbivory damages in temperate forest are needed. Therefore, we collected leaves from three strata (sun canopy, shaded canopy and understory) of 12 sugar maple trees located in southwestern Quebec to study the variation of herbivory damage type in vertical gradient of canopy. We hypothesized that the upper section of the tree will exhibit higher herbivory damage than the lower section considering the leaf quality due to a higher exposure to sun. The linear model, ANOVA and PCA analysis illustrated some significant results showing that herbivory damage pattern differs in strata.