Where Bi,c is the niche breadth of speciesi with respect to climate variable c , and p is the
proportion of that species’ SDM found in state k of the climatic
variable (e.g., within each 1°C increment of temperature or 250 mm
increment of precipitation). To facilitate comparison across species and
different niche variables, we calculated a standardized niche breadth,\(\hat{B}\)i,c , bound between zero and one, by
dividing niche breadth by the number of possible states (n ),
corrected for the finite number of states: