Grizzly Bear Habitat Selection and Conservation Strategies

Grizzly bears select habitat through a dynamic interplay of resource availability and risk avoidance. Areas rich in high-energy foods, such as berry patches and riparian vegetation, drive foraging decisions, while human infrastructure—roads, railways and extractive sites—creates displacement and elevates mortality risk. Female bears, in particular, prioritise secure foraging patches to maximise fitness, whereas population density is often constrained by top-down pressures associated with human access. Maintaining connectivity across mountain ranges and valley corridors is essential to allow dispersal, gene flow and seasonal resource tracking. Climate change further alters food phenology and snow cover, demanding adaptive management that reconciles bottom-up resource enhancement with restrictions on human activities in key zones. Effective conservation strategies integrate food-resource mapping, access controls, reclamation of industrial sites and landscape-scale corridor protection to sustain both behavioural and demographic processes underpinning grizzly bear populations worldwide.

Research from Nature Portfolio

A long-term GPS-collar study assessed grizzly bear movements in an Alberta mining region during active extraction and after mine closure and reclamation. Overall home-range overlap with mine footprints declined during active operations, except for females with cubs, who continued to utilise fragmented patches. Following reclamation, both males and females exhibited shorter movement steps near restored sites, indicating a degree of habituation to post-mining landscapes. These findings demonstrate that targeted reclamation and preservation of remnant habitat patches can mitigate the impacts of industrial disturbance, but also highlight the need to minimise direct mortality risk through access management throughout development and closure phases.

Grizzly Bear Habitat Selection and Conservation Strategies publication trend

The graph below shows the total number of articles in grizzly bear habitat selection and conservation strategies across all publications each year (not limited to Nature Index journals).

Technical terms

Bottom‐up influences: Ecological factors, such as food quantity and quality, that determine resource distribution and foraging behaviour.

Top‐down pressures: Mortality and disturbance risks imposed by predators or human activities that shape space use and population density.

Resource selection function: A statistical model estimating the relative probability of an animal using habitat features based on available versus used locations.

Step selection function: A movement‐based model comparing characteristics of successive relocation steps to infer fine‐scale habitat preferences in relation to movement states.

Merriam connectivity: An individual‐based metric of landscape connectivity that integrates structural habitat features with movement behaviour to quantify passage potential.

References

1. Berries and bullets: influence of food and mortality risk on grizzly bears in British Columbia. Wildlife Monographs (2023).
2. Towns and trails drive carnivore movement behaviour, resource selection, and connectivity. Movement Ecology (2022).
3. Large Omnivore Movements in Response to Surface Mining and Mine Reclamation. Scientific Reports (2016).