Effets de l'isolement des tourbières sur les variations génétiques et phénotypiques entre les populations de l'orchidée "Platanthera blephariglottis"

Authors: De Vriendt, Laurent
Advisor: Poulin, MoniquePellerin, Stéphanie
Abstract: The aim of this study was to characterize the connectivity of peatlands in southern Quebec using phenotypic and genetic variability among populations of the orchid Platanthera blephariglottis. Fifteen phenotypic traits were measured on 24 individuals in 20 populations and germination trials were conducted. Genetic analyses were realised through a Genotyping-By-Sequencing protocol. Isolation of populations was evaluated by the distance to the nearest population and by the number of populations occurring within different buffers around studied sites. Differences were found between populations for all phenotypic traits and several of these differences were correlated with isolation. A diminished germination was also correlated to increased isolation. The genetic structure of populations followed a pattern of Isolation-By-Distance (IBD), meaning that exchanges of propagules occur between close populations. We can thus consider peatlands as a dynamic network of interconnected patches for P. blephariglottis.
Document Type: Mémoire de maîtrise
Issue Date: 2015
Open Access Date: 24 April 2018
Permalink: http://hdl.handle.net/20.500.11794/27544
Grantor: Université Laval
Collection:Thèses et mémoires

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