Biotic and abiotic effects on temperate tree range expansion at the boreal - temperate ecotone

Evans, Piers (2018) Biotic and abiotic effects on temperate tree range expansion at the boreal - temperate ecotone. Masters thesis, Memorial University of Newfoundland.

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The broad-scale effects of climate change on the distribution of species around the planet are relatively well understood, however our predictive powers of how species ranges will shift and re-organise are hampered by species’ interactions with one another and their environments. An investigation into seedling emergence constraints of four northern temperate tree species beyond their realised geographical niche was conducted using the available literature and experimental manipulation of natural systems. Two iterations of the field experiment (2015/16 & 2016/17) allowed for development and evaluation of experimental design, particularly vertebrate herbivore exclosure design. Climatic variables were largely unimportant drivers of model species’ ability to successfully emerge at experimental sites across Newfoundland, whereas biotic interactions impacted species-specific emergence, depending on reproductive strategies. Seed predation and canopy composition were among the most important biotic drivers of model species’ emergence success.

Item Type: Thesis (Masters)
Item ID: 13226
Additional Information: Includes bibliographical references.
Keywords: boreal forest, tree, ecotone, temperate forest, seed predation, seedling, Acer saccharum, Betula alleghaniensis, Fraxinus nigra, Thuja occidentalis, range expansion
Department(s): Humanities and Social Sciences, Faculty of > Geography
Date: May 2018
Date Type: Submission
Library of Congress Subject Heading: Trees -- Geographical distribution -- Climatic factors -- Newfoundland and Labrador

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