Divergence phénotypique et génomique des écotypes planctivore et piscivore chez le touladi (Salvelinus namaycush)

Authors: Bernatchez, Simon
Advisor: Bernatchez, Louis
Abstract: Lake Trout is an important salmonid species exploited by sport fishing. This fishery is supported by planktivorous and piscivorous Lake Trout populations, that use different ecological niches. Nevertheless, knowledge about evolutionary divergence between these two ecotypes remains scarce. The goal of this study was to investigate the genomic basis of the adaptive divergence between these two Lake Trout ecotypes using morphological analyses (geometric morphometrics, linear measurements and gill rakers morphometry) and genetic analyses (3 925 single nucleotide polymorphism markers) performed on a total of 367 Lake Trout from 12 lakes. The results demonstrated a morphological divergence that is potentially related to the use of different ecologial niches, a strong neutral genomic divergence between populations and a potentially adaptive genomic divergence between ecotypes. The results of this study could be used to improve management policies for this species.
Document Type: Mémoire de maîtrise
Issue Date: 2016
Open Access Date: 23 April 2018
Permalink: http://hdl.handle.net/20.500.11794/26695
Grantor: Université Laval
Collection:Thèses et mémoires

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