Abstract
The distribution of Juniperus communis L. in the boreal forest cannot be explained merely in terms of poten- tial sites. In the Lake Duparquet area, in northwestern Quebec, this species is restricted to islands of the lake, despite an abundance of apparently similar sites on sur- rounding mainland. In order to evaluate the ecological factors, both abiotic and historical, that could be responsi- ble for this limited distribution, nineteen populations of Juniperus communis in the Lake Duparquet area were studied. A phytosociological analysis revealed that Juniperus communis can be found in three types of com- munities related to the degree of opening of the vegetation cover. Individuals can reach an age of more than 170 years and, in many cases, have survived fires. The existence of a
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