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Current and Projected Habitat Connectivity for Three Species Inhabiting Bottomland Hardwoods Throughout the Southeastern U.S.

Published by U.S. Geological Survey | Department of the Interior | Catalog Last Checked: September 04, 2026 at 06:48 PM | Dataset Last Updated: September 02, 2026 at 12:00 AM
In partnership with South Atlantic LCC members, we assessed current and projected connectivity for three species (black bear [Ursus americanus], Rafinesque’s big-eared bat [Corynorhinus rafinesquii], timber rattlesnake [Crotalus horridus]) that inhabit bottomland hardwoods throughout the southeastern US. For each species, we mapped important habitat connections between core patches of habitat using three different modeling approaches (Connectivity Analysis Toolkit (CAT), Circuitscape, and Linkage Mapper) that incorporated three types of resistance layers (expert opinion, niche modeling, and empirical data for the black bear only). The result was 21 sets of important connections, one for each of the species-resistance-connectivity algorithm combinations we analyzed. In "Connectivity for Climate Change in the Southeastern United States" data set, we present the results of overlaying all of the connections in the 21 sets of results on current climate suitability, as well as future climate suitability. The data here show the change in suitability under climate change for all connections mapped in our study. In "key landscape connections under urban growth" data set, we present the results of overlaying all of the connections in the 21 sets of results on maps of current urbanization as well as future projections of urbanization. The data here show the change in the proportion of each connection that is urbanized for all connections mapped in our study. The geographic domain of the urbanization projections we used did not cover the entire extent of our connectivity modeling effort. Therefore, some connections we mapped in the project are not included in this data set.

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