Circuitscape

Circuitscape is open-source software for modeling ecological connectivity using circuit theory. In ecological studies, landscape resistance to movement is treated analogously to electrical resistance, and wildlife movement is modeled as current flowing through a circuit. The software operates on raster landscape data in which each cell has a resistance or conductance value representing how difficult it is for organisms to traverse. Users specify source and/or target locations (focal nodes) along with configuration parameters. Circuitscape then solves the equivalent electrical network to estimate current flow and potential distribution across the landscape.

Key outputs include current density maps that highlight potential movement pathways and pinch points, as well as pairwise connectivity metrics and measures of effective resistance. These outputs can be used to identify important corridors, assess fragmentation, and prioritize conservation actions such as corridor design or land-use planning. Circuitscape supports multiple modeling modes, including one-to-all, all-to-all, and pairwise mode, depending on the research question.

Circuitscape is available as a desktop application with a graphical user interface and as a Python package, enabling integration with GIS workflows and batch processing. It runs on multiple operating systems and can be used standalone or embedded in larger ecological modeling pipelines. The method relies on established principles of circuit theory applied to landscape ecology, and it remains widely used in conservation biology and landscape genetics to explore connectivity, resilience, and the impact of habitat change.