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This layer represents least-cost (shortest-path) habitat centrality across potentiall suitable habitat for gray wolves in the Western United States. Here, least-cost centrality measures the relative role of a given portion of a potential movement path to facilitating movement of wolves across the landscape. Centrality metrics are based on graph theory. A graph is a set of nodes in which pairs of nodes can be connected by edges representing functional connections (e.g., dispersal) between the nodes. Edges can be assigned weights that represent attributes such as habitat quality. A sequence of nodes connected by edges forms a path. Landscape lattices are graphs in which every cell in a raster is treated as a node...
Landscape-level variables operating at multiple spatial scales likely influence wetland amphibian assemblages but have not been investigated in detail. We examined the significance of habitat loss and fragmentation, as well as selected within-wetland conditions, affecting amphibian assemblages in twentyone glacial marshes. Wetlands were located within ttrban and agricultural regions of central and southwestern Minnesota, USA and were distributed across two ccoregions: tallgrass prairie and northern hardwood forest. We surveyed amphibian assemblages and used a geographic information system to quantify land-use variables at lhree scales: 500, 1000, and 2500 m. Ten species of amphibians were detected, the most abundant...
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Synopsis: Large-scale patterns of land use and fragmentation have been associated with the decline of many imperiled wildlife populations. Lesser prairie-chickens (Tympanuchus pallidicinctus) are restricted to the southern Great Plains of North America, and their population and range have declined by > 90% over the past 100 years. Our objective was to examine scale-dependent relationships between landscape structure and change and long-term population trends for lesser prairie-chicken populations in the southern Great Plains. We used a geographic information system (GIS) to quantify landscape composition, pattern and change at multiple scales (extents) for fragmented agricultural landscapes surrounding 10 lesser...


    map background search result map search result map Multi-scale effects of habitat loss and fragmentation on lesser prairie-chicken populations in the US souther Great Plains. Western United States Gray Wolf Least-Cost Habitat Centrality Multi-scale effects of habitat loss and fragmentation on lesser prairie-chicken populations in the US souther Great Plains. Western United States Gray Wolf Least-Cost Habitat Centrality