Réponses du bouleau glanduleux au réchauffement climatique et au broutement par le caribou migrateur

Authors: Saucier, Valérie
Advisor: Tremblay, Jean-PierreCôté, Steeve D.
Abstract: The main objective of this study was to assess the effects of climate warming (increased temperature and soil nutrient availability) and simulated browsing on the availability and quality of dwarf birch (Betula glandulosa), one of the summer resources of migratory caribou (Rangifer tarandus). Moderate and heavy browsing reduced the biomass of dwarf birch leaves. Warming reduced the biomass and advanced the phenology of dwarf birch, potentially affecting the synchrony between caribou nutritive requirements and the availability of dwarf birch. An increase in soil nutrients availability tended to increase the biomass and quality of dwarf birch leaves, while heavy browsing combined to indirect effects of climate warming reduced fiber concentration, improving the quality of dwarf birch leaves. Dominance of browsing effects could be temporary, since climate warming effects are directional and could gradually surpass browsing effects on shrubs.
Document Type: Mémoire de maîtrise
Issue Date: 2015
Open Access Date: 23 April 2018
Permalink: http://hdl.handle.net/20.500.11794/26363
Grantor: Université Laval
Collection:Thèses et mémoires

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