Fig 1.
Study area, background area for developing a California condor landscape conductance surface (dark gray), in-flight California condor locations (July 2013-May 2017), and release sites.
Table 1.
Covariates used in developing a California condor landscape conductance surface.
Table 2.
Mean relative contribution of covariates (%), and measures of model performance for a California condor landscape conductance surface (Some columns in the upper portion of the table do not sum to 100 due to rounding).
Fig 2.
Mean electrical current for California condor circuit theory models in (a) central California and (b) southern California, USA.
Fig 3.
Continuous predicted/expected plots of electrical current models for California condors in (a) central California and (b) southern California, USA.
Blue triangles in (b) represent the predicted/expected plot when Hopper Mountain National Wildlife Refuge and the Tehachapi Mountains were added as additional ground nodes in the electrical circuit.
Fig 4.
Reverse cumulative frequency plot of in-flight California condor locations (July 2013-May 2017) in relation to electrical current for the southern and central California modeling regions, USA.
Fig 5.
Mean electrical current for a California condor circuit theory model around a proposed release site (▲) in northern California, USA.
Fig 6.
Least-cost-path linkages between California condor modeled core nesting habitats (≥10 km2) in Washington, Oregon, and California, USA.
For display purposes, core nesting habitats are represented as points and linkages between large core nesting habitats were snapped to points through core nesting habitats while maintaining their least-cost path distances.