Abstract
Abstract Many studies have shown that certain species of bryophytes and lichens require old-growth forests for their survival. The objective of this study is to evaluate the composition and diversity of epiphytic lichen and bryophyte communities on trembling aspen (Populus tremuloides), as a function of the time elapsed since stand initiation. The study was carried out in the forests surrounding Lake Duparquet, in the southwestern part of Quebec's boreal forest. Stands representing different post-fire successional stages, corresponding to 278, 125, 79, and 51 yr since the last fire were selected. For each stand age, 10 trees from four different sites were sampled. A total of 75 species of non-vascular plants were found, including 34 species of mosses, seven species of liverworts, and 34 species of lichens. More species were observed in the 278-yr old stand, which also contained a greater number of exclusive species. In a correspondence analysis performed on species presence/absence data, axes one and two ...
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