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Randomized shortest paths for Grizzly Bear dispersal between the GYE and NCDE

Dates

Publication Date
Start Date
2000-05-01
End Date
2015-10-31

Citation

van Manen, F.T., Peck, C.P., Costello, C.M., Haroldson, M.A., Landenburger, L.A., Roberts, L.L., Bjornlie, D.D., and Mace, R.D., 2017, Potential movement paths for male grizzly bear (Ursus arctos) dispersal between the Northern Continental Divide and Greater Yellowstone Ecosystems, 2000-2015: U.S. Geological Survey data release, https://doi.org/10.5066/F72V2F2W.

Summary

The Randomized Shortest Path (RSP) raster delineates potential dispersal paths for male-mediated gene flow between grizzly bear (Ursus arctos) populations in the Greater Yellowstone Ecosystem (GYE) and the Northern Continental Divide Ecosystem (NCDE). A RSP algorithm was used to estimate the average number of net passages for all grid cells at a spatial resolution of 300 m in the study region which spans parts of Montana, Idaho, and Wyoming. RSP rasters identify potential movement paths for 3 levels of random deviation determined by the parameter Θ (i.e., Θ = 0.01, 0.001, and 0.0001) for bears moving from an origin to a destination node. Lower values of Θ result in greater exploration and more random deviation around the shortest path [...]

Contacts

Attached Files

Click on title to download individual files attached to this item.

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rsp_GYE_0001.tif 39.69 MB
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rsp_GYE_0001.tif.ovr 9.58 MB
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Extension: rsp_GYE_001.zip
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Extension: rsp_GYE_01.zip
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Extension: rsp_NCDE_0001.zip
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rsp_NCDE_0001.tif.aux.xml 2.86 KB
rsp_NCDE_0001.tif.ovr 9.45 MB
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Extension: rsp_NCDE_001.zip
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rsp_NCDE_001.tif.aux.xml 2.82 KB
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Extension: rsp_NCDE_01.zip
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rsp_NCDE_01.tif.aux.xml 2.61 KB
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Extension: rsp_intersect_0001.zip
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Extension: rsp_intersect_001.zip
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Extension: rsp_intersect_01.zip
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Purpose

Randomized Shortest Path rasters were generated to delineate potential movement corridors of dispersal for male-mediated gene flow between grizzly bear populations in the Greater Yellowstone Ecosystem (GYE) and the Northern Continental Divide Ecosystem (NCDE). For several decades, grizzly bear populations in the GYE and NCDE have increased in number and range extent. Current occupied range for these two populations is separated by a geographic distance of ~110 km and the potential for immigration into the GYE from an NCDE migrant, or vice versa, is greater now than it has been for many decades. However, unlike occupied core habitat, the interstitial area between occupied ranges of the two populations is a region comprised of complex landscape mosaics under multiple jurisdictions and with varied land ownerships and multiple anthropogenic uses. Whereas the NCDE population in north central Montana is contiguous with grizzly bear populations in the Canadian Rocky Mountains, genetic evidence suggest the GYE population to the south remains isolated. Connectivity to facilitate gene flow has been a long-term management goal. RSP raster datasets provide detailed, spatially-explicit information for land managers and organizations working with land owners to identify and prioritize conservation measures that maintain or enhance the integrity of potential movement paths for grizzly bears.

Additional Information

Identifiers

Type Scheme Key
DOI https://www.sciencebase.gov/vocab/category/item/identifier https://doi.org/10.5066/F72V2F2W

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