Muskrat suitability was classified in a GIS by:
Selecting waterbodies greater than 10000m2 (assumed
this is the minimum size at which ponds are deep enough to avoid complete freezing over winter; also represents the minimum size of waterbodies selected by muskrats in previous YG muskrat habitat surveys).
Calculating the % cover of herbaceous vegetation within a 50m buffer surrounding suitably-sized waterbodies (assumed the presence of herbaceous species surrounding the waterbodies was positively related to the presence of herbaceous species within the waterbody).
Suitable waterbodies were ranked as follows (probability of muskrat occurrence): <10% cover (none), 10-30% cover (low), 30-50% cover (moderate), >50% cover (high).