10 Works

Impacts of environmental heterogeneity on natural selection in a wild bird population

Carolyne Houle, Fanie Pelletier, Marc Bélisle & Dany Garant
Natural selection has been studied for several decades, resulting in the computation of thousands of selection estimates. Although the importance of environmental conditions on selection has often been suggested, published estimates rarely take into account the effects of environmental heterogeneity on selection patterns. Here, we estimated linear and non‐linear viability selection gradients on morphological traits of 12 days‐old nestlings in a wild population of tree swallows (Tachycineta bicolor) across a large‐scale heterogeneous study system in...

Data from: Exploration profiles drive activity patterns and temporal niche specialization in a wild rodent

Elouana Gharnit, Patrick Bergeron, Dany Garant & Denis Réale
Individual niche specialization can have important consequences for competition, fitness, and ultimately population dynamics and ecological speciation. The temporal window and the level of daily activity are niche components that may vary with sex, breeding season, food supply, population density, and predator’s circadian rhythm. More recently, ecologists emphasized that traits such as dispersal and space use could depend on personality differences. Boldness and exploration have been shown to correlate with variation in foraging patterns, habitat...

Data from: Trade-off between offspring mass and number: the lightest offspring bear the costs

Joanie Van De Walle
Life history theory predicts a trade-off between offspring size and number. However, the role of intra-litter phenotypic variation in shaping this trade-off is often disregarded. We compared the strength of the relationship between litter size and mass from the perspective of the lightest and the heaviest yearling offspring in 110 brown bear litters in Sweden. We showed that the mass of the lightest yearlings decreased with increasing litter size, but that the mass of the...

Behavioral variation in natural contests: integrating plasticity and personality

Charline Couchoux, Dany Garant, Maxime Aubert, Jeanne Clermont & Denis Réale
Animals often interact aggressively when competing over limited resources. Aggressive decisions can be complex, and may result from multiple sources of behavioral variation. The outcome of contests may be explained through contest theory and personality, by considering conjointly plasticity and individual consistency. This integrative approach also allows investigating individual differences in responsiveness to environmental changes. Here we observed multiple agonistic interactions occurring among eastern chipmunks (Tamias striatus) competing for food resources supplied at different distances...

Data from: Siring success in kangaroos: size matters for those in the right place at the right time

Luca Montana, François Rousseu, Dany Garant & Marco Festa-Bianchet
In polygynous species, male reproductive success is predicted to be monopolized by a few dominant males. This prediction is often not supported, suggesting that ecological and alternative mating tactics influence siring success. The spatiotemporal distribution of individuals and the number of males competing for each receptive female are often overlooked, because they are difficult to monitor in wild animals. We examined how spatial overlap of female-male pairs, the time spent by a male on the...

Landscape composition and local floral resources influence foraging behavior but not the size of Bombus impatiens Cresson (Hymenoptera: Apidae) workers

Amélie Gervais, Ève Courtois, Valérie Fournier & Marc Bélisle
Here, we assessed how the morphology, weight and foraging behavior of individual workers are affected by their surrounding landscape. We hypothesized that colonies established in landscapes showing high cover of intensive crops and low cover of flowering crops, as well as low amounts of local floral resources, would produce smaller workers, which would perform fewer foraging trips and collect pollen loads less constant in species composition. We tested these predictions with 80 colonies of commercially...

Data from: Disentangling direct and indirect determinants of the duration of maternal care in brown bears: environmental context matters

Joanie Van De Walle
The duration of maternal care, an important life history trait affecting population dynamics, varies greatly within species. Yet, our understanding of its predictors is limited, mostly correlative, and subject to misinterpretations, due to difficulties to disentangle the role of maternal- and offspring-related characteristics. We conducted path analysis on a dataset including 217 brown bear litters captured over a 29-year period in two populations in Sweden (“North” and “South”) facing contrasting environmental conditions to identify and...

Consumption of red maple in anticipation of beech mast-seeding drives reproduction in Eastern chipmunks

Mathilde Tissier, Denis Réale, Dany Garant & Patrick Bergeron
1. Understanding the determinants of reproduction is a central question in evolutionary ecology. In pulsed resources environments, the reproduction and population dynamics of seed consumers is driven by pulsed production of seeds by trees, or mast-seeding. In Southern Québec, eastern chipmunks (Tamias striatus) exclusively reproduce during the summer before and the spring after a mast-seeding event of American beech. They thus seem to anticipate beech mast by reproducing during early summer, so that juveniles can...

Earlier spring reduces potential for gene flow via reduced flowering synchrony across an elevational gradient

Sébastien Rivest, Geneviève Lajoie, David Watts & Mark Vellend
Premise: One of the best-documented ecological responses to climate warming involves temporal shifts of phenological events. However, we lack an understanding of how phenological responses to climate change vary among populations of the same species. Such variability has the potential to affect flowering synchrony among populations and hence the potential for gene flow. Methods: To test if an earlier start of the growing season affects the potential for gene flow among populations, we quantified the...

Data from: The island syndrome hypothesis is only partially validated in two rodent species in an inland-island system

Tristan Juette, Dany Garant, Joël W Jameson & Denis Réale
According to the island syndrome and island rule hypotheses, island isolation and reduced area lead to phenotypic shifts in ecologically relevant traits in insular populations compared to mainland ones. These hypotheses have been built up with oceanic islands in mind or islands where isolation is high and colonization rate relatively limited. This set of hypotheses, however, may not be applicable to other inland-island systems or recently fragmented landscapes. We investigated how island life leads to...

Registration Year

  • 2020

Resource Types

  • Dataset


  • Université de Sherbrooke
  • University of Quebec at Montreal
  • Bishop's University
  • Université Alassane Ouattara
  • University of Ottawa
  • Université du Québec à Rimouski
  • Université Laval