Des Ursulines Building
300 Allée des Ursulines
4187231986 extension 1867
Foraging and physiological condition are key determinants in ecology as they can affect individual growth, reproduction and survival. Nutrition is link to body condition and may influences juvenile growth rate, adult mass gain, probability of pregnancy, over-winter survival, timing of parturition, neonatal birth mass and survival.
During my thesis project, I will study individual differences in the diet composition and physiological condition of the endangered Atlantic-Gaspésie caribou population using chemical markers. I will evaluate trophic relationships between the caribou, moose, coyote and black bear in the Gaspésie national park using stable isotope analyses.
We focused our study on the range of the Atlantic–Gaspésie caribou population, a small and relict herd using bare habitats found at high elevations in the Gaspésie National Park. Three groups of summits are used by caribou, namely the Logan ridge, Albert plateaus, and McGerrigle area. The study area is characterized by three distinct ecological zones, the montane area, the subalpine forest, and the alpine tundra. The population was designated as Endangered in 2000 under the Canadian Species at Risk Act and the estimated population size ranged between 69 and 82 caribou in the 2017 aerial survey.
We collected hair and blood samples from 44 caribou captured in 2013 and 2014 and hair samples from mooses, coyotes and black bears between 2016 and 2018. We collected more than 500 plant samples across the Gaspésie caribou range. Carbon and nitrogen stable isotope signatures will be measured for hair and blood samples. We measured trace element concentrations for caribou hair samples only.
This study will provide essential information to understand the ecology of this isolated herd and to contribute efficiently to its recovery. It is the first step to study link between nutrition, body condition, reproduction and survival.
Rioux, È., Pelletier, F., St-Laurent, M.-H., 2019. Influence of lipids on stable isotope ratios in mammal hair: highlighting the importance of validation. Ecosphere, 10(5), e02723. DOI: 10.1002/ecs2.2723.