16 Works

Data from: Linking genetic and ecological differentiation in an ungulate with a circumpolar distribution

Glenn Yannic, Joaquín Ortego, Loïc Pellissier, Nicolas Lecomte, Louis Bernatchez & Steeve D. Côté
Genetic differentiation among populations may arise from the disruption of gene flow due to local adaptation to distinct environments and/or neutral accumulation of mutations and genetic drift resulted from geographical isolation. Quantifying the role of these processes in determining the genetic structure of natural populations remains challenging. Here, we analyze the relative contribution of isolation-by-resistance (IBR), isolation-by-environment (IBE), genetic drift and historical isolation in allopatry during Pleistocene glacial cycles on shaping patterns of genetic differentiation...

Data from: Independence among physiological traits suggests flexibility in the face of ecological demands on phenotypes

Deborah M. Buehler, Francois Vézina, Wolfgang Goymann, Ingrid Schwabl, Maaike Versteegh, B. Irene Tieleman & Theunis Piersma
Phenotypic flexibility allows animals to adjust their physiology to diverse environmental conditions encountered over the year. Examining how these varying traits covary gives insights into potential constraints or freedoms that may shape evolutionary trajectories. In this study we examined relationships among hematocrit, baseline corticosterone concentration, constitutive immune function and basal metabolic rate in red knot Calidris canutus islandica individuals subjected to experimentally manipulated temperature treatments over an entire annual cycle. If covariation among traits is...

Data from: Temporally dynamic habitat suitability predicts genetic relatedness among caribou

Glenn Yannic, Loïc Pellissier, Maël Le Corre, Christian Dussault, Louis Bernatchez, Steeve D. Côté & S. D. Cote
Landscape heterogeneity plays a central role in shaping ecological and evolutionary processes. While species utilization of the landscape is usually viewed as constant within a year, the spatial distribution of individuals is likely to vary in time in relation to particular seasonal needs. Understanding temporal variation in landscape use and genetic connectivity has direct conservation implications. Here, we modelled the daily use of the landscape by caribou in Quebec and Labrador, Canada and tested its...

Data from: Caribou, water, and ice – fine-scale movements of a migratory arctic ungulate in the context of climate change

Mathieu Leblond, Martin-Hugues St-Laurent & Steeve D. Côté
Freshwater lakes and rivers of the Northern Hemisphere have been freezing increasingly later and thawing increasingly earlier during the last century. With reduced temporal periods during which ice conditions are favourable for locomotion, freshwater bodies could become impediments to the inter-patch movements, dispersion, or migration of terrestrial animals that use ice-covered lakes and rivers to move across their range. Studying the fine-scale responses of individuals to broad-scale changes in ice availability and phenology would help...

Where to spend the winter? The role of intraspecific competition and climate in determining the selection of wintering areas by migratory caribou

Mael Le Corre, Christian Dussault & Steeve D. Côté
Depicted as predictable movements, migrations can, however, show important interannual variations, making the conservation of migratory species particularly challenging. Plasticity in migratory behaviour allows individuals to adjust their migratory tactics to maximize their fitness. Destination of migration, and therefore migration patterns, may vary according to climatic and environmental conditions encountered during migration or at the arrival site but also according to competition. In Northern-Québec and Labrador, Canada, fall migration patterns of caribou from the Rivière-George...

No evidence of inbreeding depression in fast declining herds of migratory caribou

Marianne Gagnon, Glenn Yannic, Charles Perrier & Steeve D. Côté
Identifying inbreeding depression early in small and declining populations is essential for management and conservation decisions. Correlations between heterozygosity and fitness (HFCs) provide a way to identify inbreeding depression without prior knowledge of kinship among individuals. In Northern Quebec and Labrador, the size of two herds of migratory caribou (Rivière‐George, RG and Rivière‐aux‐Feuilles, RAF) has declined by one to two orders of magnitude in the last three decades. This raises the question of a possible...

Data from: Putative causes and consequences of MHC variation within and between locally adapted stickleback demes

R. J. Scott McCairns, Sébastien Bourget & Louis Bernatchez
Genes of the major histocompatibility complex have been a source of considerable research interest, owing in large part to the growing body of evidence that they may be subject to both natural and sexual selection. However, much remains to be learned about the dynamics of MHC genes in subdivided populations, particularly those characterized by divergent ecological pressures. In this study, we attempt to disentangle the relative roles of both parasite-mediated selection, and MHC-mediated mate choice...

Data from: Getting ready for the winter: timing and determinants of molt in an alpine ungulate

Florent Déry, Sandra Hamel & Steeve D. Côté
Because growth of new hairs entails energetic costs, individual condition and access to food should determine the timing of molt. Previous studies on the timing of molt in ungulates have mostly focused on the influence of age-class and reproductive status, but the effects of body condition and environmental phenology have not been evaluated. Our goal was to assess how intrinsic traits and environmental conditions determine the timing of winter coat shedding in a mountain goat...

Data from: Refuge or predation risk? Alternate ways to perceive hiker disturbance based on maternal state of female caribou

Frederic Lesmerises, Chris J. Johnson & Martin-Hugues St-Laurent
Human presence in natural environments is often a source of stress that is perceived by large ungulates as an increased risk of predation. Alternatively, disturbance induced by hikers creates a relatively predator-free space that may serve as a refuge. We measured the behavioral responses of female caribou to disturbance associated with the presence of hikers during summer in the Gaspésie National Park. We used those data to determine whether caribou responded negatively to human activity...

Data from: Quantifying individual heterogeneity and its influence on life-history trajectories: different methods for different questions and contexts

Sandra Hamel, Jean-Michel Gaillard, Mathieu Douhard, Marco Festa-Bianchet, Fanie Pelletier & Nigel G. Yoccoz
Heterogeneity among individuals influences the life-history trajectories we observe at the population level because viability selection, selective immigration and emigration processes, and ontogeny change the proportion of individuals with specific trait values with increasing age. Here, we review the two main approaches that have been proposed to account for these processes in life-history trajectories, contrasting how they quantify ontogeny and selection, and proposing ways to overcome some of their limitations. Nearly all existing approaches to...

Data from an experimental study to determine the impact of snow hardness on lemming locomotion

Mathilde Poirier, Dominique Fauteux, Gilles Gauthier, Florent Dominé & Jean-François Lamarre
Lemmings are an essential link of the Arctic food web as they are the main prey of many predators inhabiting these regions. These small rodents exhibiting cyclic fluctuation of their population can stay active throughout the winter and must dig a network of tunnels in the snow to reach vegetation on which they are feeding. Therefore, snow hardness where they dig has the potential to affect their effort while digging as well as their performance....

Data from: Compensatory conservation measures for an endangered caribou population under climate change

Sarah Bauduin, Eliot McIntire, Martin-Hughes St-Laurent & Steven G. Cumming
Future human land use and climate change may disrupt movement behaviors of terrestrial animals, thereby altering the ability of individuals to move across a landscape. Some of the expected changes result from processes whose effects will be difficult to alter, such as global climate change. We present a novel framework in which we use models to (1) identify the ecological changes from these difficult-to-alter processes, as well as (2) the potential conservation measures that are...

Data from: Trophic interactions and abiotic factors drive functional and phylogenetic structure of vertebrate herbivore communities across the Arctic tundra biome

James D.M. Speed, Ina A. Skjelbred, Isabel C. Barrio, Michael D. Martin, Dominique Berteaux, C. Guillermo Bueno, Katie S. Christie, Bruce C. Forbes, Jennifer Forbey, Daniel Fortin, Jon-Arvid Grytnes, Katrine S. Hoset, Nicolas Lecomte, Bryndis Marteinsdottir, Jesper B. Mosbacher, Åshild O. Pedersen, Virve Ravolainen, Eileen C. Rees, Anna Skarin, Natalya Sokolova, Andrew H. Thornhill, Ingunn Tombre & Eeva M. Soininen
Communities are assembled from species that evolve or colonise a given geographic region, and persist in the face of abiotic conditions and interactions with other species. The evolutionary and colonisation histories of communities are characterised by phylogenetic diversity, while functional diversity is indicative of abiotic and biotic conditions. The relationship between functional and phylogenetic diversity infers whether species functional traits are divergent (differing between related species) or convergent (similar among distantly related species). Biotic interactions...

Data from: Adjustments in habitat selection to changing availability induce fitness costs for a threatened ungulate

Chrystel L. Losier, Serge Couturier, Martin-Hugues St-Laurent, Pierre Drapeau, Claude Dussault, Tyler Rudolph, Vincent Brodeur, Jerod A. Merkle & Daniel Fortin
1. Functional responses in habitat selection occur when individuals adjust their selection of habitat features as a function of the availability of those features. Functional responses in habitat selection are generally assumed to be fitness-rewarding tactics and are used to guide conservation actions. Fitness consequences of functional responses, however, have rarely been evaluated. 2. Eighty-three caribou were followed with GPS collars to establish the link between functional responses in habitat selection and adult female survival,...

Data from: Caribou avoiding wolves face increased predation by bears – caught between Scylla and Charybdis

Mathieu Leblond, Christian Dussault, Jean-Pierre Ouellet & Martin-Hugues St-Laurent
1. Prey may trade off resource acquisition with mortality risk by using various habitat-selection strategies. Empirical assessments have shown that the functional and numerical responses of predators to human disturbances are variable, yet spatial changes in predation risk by two predators have seldom been studied for prey occurring in human-modified landscapes. Using the boreal caribou (Rangifer tarandus caribou) – grey wolf (Canis lupus) – black bear (Ursus americanus) system in eastern Canada, we investigated whether...

Data from: Putative causes and consequences of MHC variation within and between locally adapted stickleback demes

R. J. Scott McCairns, Sébastien Bourget & Louis Bernatchez
Genes of the major histocompatibility complex have been a source of considerable research interest, owing in large part to the growing body of evidence that they may be subject to both natural and sexual selection. However, much remains to be learned about the dynamics of MHC genes in subdivided populations, particularly those characterized by divergent ecological pressures. In this study, we attempt to disentangle the relative roles of both parasite-mediated selection, and MHC-mediated mate choice...

Registration Year

  • 2021
    1
  • 2019
    4
  • 2018
    1
  • 2017
    2
  • 2016
    3
  • 2015
    1
  • 2014
    1
  • 2012
    1
  • 2010
    2

Resource Types

  • Dataset
    16

Affiliations

  • Center for Northern Studies
    16
  • Université Laval
    8
  • The Arctic University of Norway
    3
  • Université de Moncton
    2
  • Max Planck Institute for Ornithology
    1
  • Estación Biológica de Doñana
    1
  • Université de Sherbrooke
    1
  • Université Paul-Valéry Montpellier
    1
  • University of Groningen
    1
  • University of Lyon System
    1