16 Works

Data from: Linking transcriptomic and genomic variation to growth in brook charr hybrids (Salvelinus fontinalis, Mitchill)

Eric Normandeau, Louis Bernatchez, Bérénice Bougas & Céline Audet
Hybridization can lead to phenotypic differences arising from changes in gene expression patterns or new allele combinations. Variation in gene expression is thought to be controlled by differences in transcription regulation of parental alleles, either through cis or trans regulatory elements. A previous study among brook charr hybrids from different populations (Rupert, Laval, and domestic) showing distinct length at age during early life stages also revealed different patterns in transcription regulation inheritance of transcript abundance....

Data from: Population genetics of the American eel (Anguilla rostrata): FST = 0 and NAO effects on demographic fluctuations of a panmictic species

Caroline L. Côté, Martin Castonguay, Pierre-Alexandre Gagnaire, Vincent Bourret, Guy Verreault & Louis Bernatchez
We performed population genetic analyses on the American eel (Anguilla rostrata) with three main objectives. First, we conducted the most comprehensive analysis of neutral genetic population structure to date in order to revisit the null hypothesis of panmixia in this species. Second, we used this data to provide the first estimates of contemporary effective population size (Ne) and to document temporal variation in effective number of breeders (Nb) in American eel. Third, we tested for...

Data from: The influence of parental effects on transcriptomic landscape during early development in brook charr (Salvelinus fontinalis, Mitchill)

Louis Bernatchez, Céline Audet & Bérénice Bougas
Parental effects represent an important source of variation in offspring phenotypes. Depending on the specific mechanisms involved, parental effects may be caused to different degrees by either the maternal or the paternal parent, and these effects may in turn act at different stages of development. To detect parental effects acting on gene transcription regulation and length phenotype during ontogeny, the transcriptomic profiles of two reciprocal hybrids from Laval × Rupert and Laval × Domestic populations...

Data from: Parallelism in the oxygen transport system of the lake whitefish: the role of physiological divergence in ecological speciation

Melissa L. Evans, Kim Præbel, Stefano Peruzzi & Louis Bernatchez
In North America, populations of lake whitefish (Coregonus clupeaformis) have evolved sympatric “dwarf” and “normal” ecotypes that are associated with distinct trophic niches within lakes. Trophic specialization should place diverging physiological demands on individuals; thus, genes and phenotypes associated with energy production represent ideal candidates for studies of adaptation. Here, we test for parallelism in physiological traits involved in oxygen transport in lake whitefish from Québec, Canada, and Maine, USA. We observed significant divergence in...

Data from: Glacial cycles as an allopatric speciation pump in North Eastern American freshwater fishes

Julien April, Robert H. Hanner, Anne-Marie Dion-Côté & Louis Bernatchez
Allopatric speciation may be the principal mechanism generating new species. Yet, it remains difficult to judge the generality of this process because few studies have provided evidence that geographic isolation has triggered the development of reproductive isolation over multiple species of a regional fauna. Here, we first combine results from new empirical data sets (7 taxa) and published literature (9 taxa) to show that the eastern Great Lakes drainage represents a multispecies suture zone for...

Data from: Short-term genetic changes: evaluating effective population size estimates in a comprehensively described brown trout (Salmo trutta) population

Dimitar Serbezov, Per Erik Jorde, Louis Bernatchez, Esben Moland Olsen & L. Asbjørn Vøllestad
The effective population size (Ne) is notoriously difficult to accurately estimate in wild populations as it is influenced by a number of parameters that are difficult to delineate in natural systems. The different methods that are used to estimate Ne are impacted variously by different processes at the population level, such as the life-history characteristics of the organism, gene flow, population substructure, as well as by the frequency patterns of genetic markers used and the...

Data from: Stocking impacts the expression of candidate genes and physiological condition in introgressed brook charr (Salvelinus fontinalis) populations

Fabien C. Lamaze, Dany Garant & Louis Bernatchez
Translocation of plants and animal populations between environments is one of the major forms of anthropogenic perturbation experienced by pristine populations, and consequently, human mediated hybridization by stocking practices between wild and exogenous conspecifics is of increasing concern. In this study, we compared the expression of seven candidate genes involved in multifactorial traits and regulatory pathways for growth as a function of level of introgressive hybridization between wild and domestic brook charr to test the...

Data from: Reduced fitness of Atlantic salmon released in the wild after one generation of captive-breeding

Emmanuel Milot, Charles Perrier, Lucie Papillon, Julian J. Dodson & Louis Bernatchez
Salmonids rank among the most socio-economically valuable fishes and the most targeted species by stocking with hatchery-reared individuals. Here, we used molecular parentage analysis to assess the reproductive success of wild- and hatchery- born Atlantic salmon over three consecutive years in a small river in Québec. Yearly restocking in this river follows a single generation of captive breeding. Among the adults returning to the river to spawn, between 11% and 41% each year were born...

Data from: Plasticity and heritability of morphological variation within and between parapatric stickleback demes

R. J. Scott McCairns & Louis Bernatchez
The threespine stickleback (Gasterosteus aculeatus) has emerged as an important model organism in evolutionary ecology, largely due to the repeated, parallel evolution of divergent morphotypes found in populations having colonized freshwater habitats. However, morphological divergence following colonization is not a universal phenomenon. We explore this in a large-scale estuarine ecosystem inhabited by two parapatric stickleback demes, each physiologically adapted to divergent osmoregulatory environments (fresh vs. saline waters). Using geometric morphometric analyses of wild-caught individuals, we...

Data from: Groups of related belugas (Delphinapterus leucas) travel together during their seasonal migrations in and around Hudson Bay

Gabriel J. Colbeck, Pierre Duchesne, Lianne D. Postma, Véronique Lesage, Mike O. Hammill & Julie Turgeon
Social structure involving long-term associations with relatives should facilitate the learning of complex behaviours such as long-distance migration. In and around Hudson Bay (Canada), three stocks of beluga whales form a panmictic unit, but have different migratory behaviours associated with different summering areas. We analysed genetic variation at 13 microsatellite loci among 1524 belugas, to test hypotheses about social structure in belugas. We found significant proportions of mother–offspring pairs throughout the migratory cycle, but average...

Data from: Mapping phenotypic, expression and transmission ratio distortion QTL using RAD markers in the Lake Whitefish (Coregonus clupeaformis)

Pierre-Alexandre Gagnaire, Éric Normandeau, Scott Pavey, Louis Bernatchez & Scott A. Pavey
The evolution of reproductive isolation in an ecological context may involve multiple facets of species divergence on which divergent selection may operate. These include variation in quantitative phenotypic traits, regulation of gene expression, and differential transmission of particular allelic combinations. Thus, an integrative approach to the speciation process involves identifying the genetic basis of these traits, in order to understand how they are affected by divergent selection in nature and how they ultimately contribute to...

Data from: Oxidative phosphorylation gene transcription in whitefish species pairs reveals patterns of parallel and non-parallel physiological divergence

Melissa L. Evans & Louis Bernatchez
Across multiple lakes in North America, lake whitefish (Coregonus clupeaformis) have independently evolved “dwarf” and “normal” sympatric species pairs that exhibit pronounced phenotypic and genetic divergence. In particular, traits associated with metabolism have been shown to be highly differentiated between whitefish species. Here, we examine the transcription of genes associated with all five mitochondrial and nuclear genome-encoded oxidative phosphorylation (OXPHOS) complexes, the primary physiological mechanism responsible for the production of ATP, in whitefish species pairs...

Data from: Scanning SNPs from a large set of expressed genes to assess the impact of artificial selection on the undomesticated genetic diversity of white spruce

Marie-Claire Namroud, Jean Bousquet, Trevor Doerksen & Jean Beaulieu
A scan involving 1134 single-nucleotide polymorphisms (SNPs) from 709 expressed genes was used to assess the potential impact of artificial selection for height growth on the genetic diversity of white spruce. Two case populations of different sizes simulating different family selection intensities (K = 13% and 5%, respectively) were delineated from the Quebec breeding program. Their genetic diversity and allele frequencies were compared with those of control populations of the same size and geographic origin...

Data from: SNP-array reveals genome wide patterns of geographical and potential adaptive divergence across the natural range of Atlantic salmon (Salmo salar)

Vincent Bourret, Matthew P. Kent, Craig R. Primmer, Anti Vasemägi, Sten Karlsson, Kjetil Hindar, Philip McGinnity, Eric Verspoor, Louis Bernatchez & Sigbjørn Lien
Atlantic salmon (Salmo salar) is one of the most extensively studied fish species in the world due to its significance in aquaculture, fisheries and ongoing conservation efforts to protect declining populations. Yet, limited genomic resources have hampered our understanding of genetic architecture in the species and the genetic basis of adaptation to the wide range of natural and artificial environments it occupies. In this paper, we describe the development of a medium density Atlantic salmon...

Data from: Does catch and release affect the mating system and individual reproductive success of wild Atlantic salmon (Salmo salar L.)?

Antoine Richard, Mélanie Dionne, Jinliang Wang & Louis Bernatchez
In this study, we documented the breeding system of a wild population of Atlantic salmon (Salmo salar L.) by genetically sampling every returning adult and assessed the determinants of individual fitness. We then quantified the impacts of catch and release (C&R) on mating and reproductive success. Both sexes showed high variance in individual reproductive success, and the estimated standardized variance was higher for males (2.86) than for females (0.73). We found a weak positive relationship...

Data from: Disentangling the roles of history and local selection in shaping clinal variation of allele frequencies and gene expression in Norway spruce (Picea abies)

Jun Chen, Thomas Källman, Xiaofei Ma, Niclas Gyllenstrand, Giusi Zaina, Michele Morgante, Jean Bousquet, Andrew Eckert, Jill Wegrzyn, David B. Neale, Ulf Lagercrantz, Martin Lascoux & David Neale
Understanding the genetic basis of local adaptation is challenging due to the subtle balance among conflicting evolutionary forces that are involved in its establishment and maintenance. One system with which to tease apart these difficulties are clines in adaptive characters. Here we analyzed genetic and phenotypic variation in bud set, a highly heritable and adaptive trait, among 18 populations of Norway spruce (Picea abies), arrayed along a latitudinal gradient ranging from 47°N to 68°N. We...

Registration Year

  • 2012
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Affiliations

  • Université Laval
    16
  • Université de Sherbrooke
    1
  • University of Guelph
    1
  • University of Oslo
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  • Maryville University
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  • Virginia Commonwealth University
    1
  • Fisheries and Oceans Canada
    1
  • Swedish University of Agricultural Sciences
    1
  • University College Cork
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  • Zoological Society of London
    1