The key purpose of the research was on evaluating changes taking place across shrub cover since the last 30 year. This is an area in which a large population of caribou increased and decreased, while there was an increase in the mean yearly temperature by 3 degrees Celsius. The inertia between 1972 and 2010 of shrub cover has been contrasting with the observable increment in shrub cover all across the central region of Nunavik. The data presented in the research does not permit a direct link between the lacks of expanded shrub and the pressure of browsing across the herd of Riviere-aux-Feuilles (Plante et al., 2014). However, high density of caribou in association with the demographically growing population from the year 1975 to the year 2001 may explain the inertia delivered by shrub species across change in climate at the research site. This is with respect to the past research discovering that there can be a reduction in shrub cover under heavy browsing of caribou, or the growth in shrub and biomass ended up increasing in a significant manner in which there is exclusion of caribou. In addition, as shrubs appear to be sparse at the level of landscape across the herbaceous arctic tundra, browsing of caribou has key concentration on the availability of some shrub patches. This provides that caribou is able of controlling the expanded species of shrub within landscapes of sparse vegetation (Plante et al., 2014). As a matter of fact, irrespective of the declining herd from the year 2001 to the year 2011, 70 per cent of the shrubs still have less than 50 per cent of the browsed shoots in the year 2011. There has been a key observation of shrub expansion in subarctic regions within closer proximity to tree line, with warm temperatures of air and within the discontinuous permafrost region.