This map has a variety of layers important for conserving fisher connectivity, including the one that loads by default which combines several of the layers to look at conservation priority not only within linkages and core areas, but among them as well.
Please see the report for background and methods:
Spencer, W., J. Brice, D. DiPietro, J. Gallo, M. Reilly, H. Romsos. 2019. Habitat Connectivity for
Fishers and Martens in the Klamath Basin Region of California and Oregon. Conservation
Biology Institute. https://doi.org/10.6084/m9.figshare.8411909