Restricted cross-scale habitat selection by American beavers

Area of Science:

• Ecology
• Wildlife Conservation
• Habitat Selection

Background:

• Habitat selection is a key ecological process influenced by spatial scale.
• Previous American beaver (Castor canadensis) research has focused on single spatial scales, lacking multi-scale analysis.

Purpose of the Study:

• To investigate if American beaver habitat selection is specialized to semiaquatic environments.
• To determine the consistency of habitat selection variables across landscape and fine spatial scales for beavers.

Main Methods:

• Utilized maximum entropy (MaxEnt) models for landscape-scale presence-only data analysis.
• Employed generalized linear mixed models with global positioning system (GPS) data for fine-scale habitat selection evaluation.
• Compared explanatory variables between landscape and fine spatial scales.

Main Results:

• Beaver habitat selection was congruent at both coarse (study area) and fine (home range) scales.
• Selection was positively influenced by woody wetland edge density and shrub edge density.
• Selection was negatively influenced by open water edge density and positively by decreased grass frequency at the landscape scale.

Conclusions:

• American beaver habitat selection patterns are consistent across multiple spatial scales.
• Beavers balance needs for foraging, construction, and predator avoidance, influencing their habitat choices.
• Habitat variables like edge density and water availability are critical determinants of beaver distribution and fitness.