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This is a map of populated areas with population density greater than or equal to 1 individual/ha (i.e., rural/exurban but including suburban and urban as defined by Marzluff et al. 2001) as determined from U.S. Census data corrected for public lands.
Humans have dramatically altered wildlands in the western United States over the past 100 years by using these lands and the resources they provide. Anthropogenic changes to the landscape, such as urban expansion, construction of roads, power lines, and other networks and land uses necessary to maintain human populations influence the number and kinds of plants and wildlife that remain. We developed the map of the human footprint for the western United States from an analysis of 14 landscape structure and anthropogenic features: human habitation, interstate highways, federal and state highways, secondary roads, railroads, irrigation canals, power lines, linear feature densities, agricultural land, campgrounds, highway...
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The potentiometric surface of the Sparta Sand in northern Louisiana is shown by contours on four maps. Maps for 1900, 1965 , and spring 1975 are generalized, small-scale maps from previously published reports. The spring 1980 map (1:500,000) is based on measurements in 144 wells and includes the southern tier of counties in southern Arkansas. The map shows regional effects of pumping from the Sparta Sand and effects of local pumping centers at Magnolia and El Dorado, Ark., and at Minden, Ruston, Jonesboro-Hodge, Winnfield, Bastrop, and in the Monroe area of Louisiana. (USGS) First release: April, 2019; revised April 2021 (version 1.1). The previous version can be obtained by contacting the USGS Lower Mississippi-Gulf...
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This dataset represents the connections between each nearby pair of 2080 cores for Saltmarsh sparrow. It is intended to highlight areas important for connecting cores and to visually represent the connections among refugia cores.
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This dataset represents the connections between each nearby pair of 2080 cores for Moose. It is intended to highlight areas important for connecting cores and to visually represent the connections among refugia cores.
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This dataset represents the connections between each nearby pair of 2080 cores for Bicknell's thrush. It is intended to highlight areas important for connecting cores and to visually represent the connections among refugia cores.
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This dataset represents the connections between each nearby pair of 2080 cores for Blackburnian warbler. It is intended to highlight areas important for connecting cores and to visually represent the connections among refugia cores.
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This dataset represents the connections between each nearby pair of 2080 cores for Blackburnian warbler. It is intended to highlight areas important for connecting cores and to visually represent the connections among refugia cores.
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This dataset represents the connections between each nearby pair of 2080 cores for Box turtle. It is intended to highlight areas important for connecting cores and to visually represent the connections among refugia cores.
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This dataset represents the connections between each nearby pair of 2080 cores for Saltmarsh sparrow. It is intended to highlight areas important for connecting cores and to visually represent the connections among refugia cores.
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The most widely used aquifer for industry and public supply in the Mississippi embayment in Arkansas, Louisiana, Mississippi, and Tennessee is the Sparta-Memphis aquifer. Decades of pumping from the Sparta-Memphis aquifer have affected ground-water levels throughout the Mississippi embayment. Regional assessments of water-level data from the aquifer are important to document regional water-level conditions and to develop a broad view of the effects of ground-water development and management on the sustainability and availability of the region's water supply. This information is useful to identify areas of water-level declines, identify cumulative areal declines that may cross State boundaries, evaluate the effectiveness...
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The potentiometric surface of the Sparta Sand in northern Louisiana is shown by contours on four maps. Maps for 1900, 1965 , and spring 1975 are generalized, small-scale maps from previously published reports. The spring 1980 map (1:500,000) is based on measurements in 144 wells and includes the southern tier of counties in southern Arkansas. The map shows regional effects of pumping from the Sparta Sand and effects of local pumping centers at Magnolia and El Dorado, Ark., and at Minden, Ruston, Jonesboro-Hodge, Winnfield, Bastrop, and in the Monroe area of Louisiana. (USGS) First release: April, 2019; revised April 2021 (version 1.1). The previous version can be obtained by contacting the USGS Lower Mississippi-Gulf...
This model was constructed to model the risk of invasion by exotic plant species. Roads may directly influence exotic plant dispersal via disturbance during road construction or via alterations in soil regimes. For example, in Californian serpentine soil ecosystems, exotic plant species can be found up to 1km from the nearest road and Russian thistle (Salsola kali), an exotic forb growing along roads, is wind-dispersed over distances greater than 4km. Roads may also indirectly facilitate the dispersal of exotic grasses, such as crested wheatgrass (Agropyron cristatum), via human seeding along road verges or in burned areas near roads as a management strategy to curb the establishment of less desirable exotic grass...
map background search result map search result map Proportion of Exotic Grass and Forbs Land Cover (5-km scale) in the Wyoming Basins Ecoregional Assessment area Exotic Plant Invasion Risk in the Western United States The Human Footprint in the West Proportion of Juniper Land Cover (5-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Low and Black Sagebrush Land Cover (3-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Juniper Land Cover (540-m scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Low and Black Sagebrush Land Cover (540-m scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Mixed Shrubland Land Cover (18-km scale) in the Wyoming Basins Ecoregional Assessment area Populated Areas in the Western United States Soil Depth in the Western United States Digitized Contours from Georeferenced Plate 1965 from "Potentiometric maps of the Sparta Sand, northern Louisiana and southern Arkansas, 1900, 1965, 1975, and 1980" (Ryals, 1980; version 1.1, April 2021) Digitized Contours from Georeferenced Plate 1975 from "Potentiometric maps of the Sparta Sand, northern Louisiana and southern Arkansas, 1900, 1965, 1975, and 1980" (Ryals, 1980; version 1.1, April 2021) Digitized Contour from Georeferenced plate 2007 from "Potentiometric Surface in the Sparta-Memphis Aquifer of the Mississippi Embayment, Spring 2007" (Shrader, 2008; version 1.1, April 2021) Bicknell's thrush 2080 conductance Blackburnian warbler Climate Refugia 2080 Blackburnian warbler Landscape Capability Moose Climate Refugia 2080 Box turtle Climate Refugia 2080 Saltmarsh sparrow 2080 conductance Saltmarsh sparrow Landscape Capability Digitized Contours from Georeferenced Plate 1965 from "Potentiometric maps of the Sparta Sand, northern Louisiana and southern Arkansas, 1900, 1965, 1975, and 1980" (Ryals, 1980; version 1.1, April 2021) Digitized Contours from Georeferenced Plate 1975 from "Potentiometric maps of the Sparta Sand, northern Louisiana and southern Arkansas, 1900, 1965, 1975, and 1980" (Ryals, 1980; version 1.1, April 2021) Digitized Contour from Georeferenced plate 2007 from "Potentiometric Surface in the Sparta-Memphis Aquifer of the Mississippi Embayment, Spring 2007" (Shrader, 2008; version 1.1, April 2021) Proportion of Exotic Grass and Forbs Land Cover (5-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Juniper Land Cover (5-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Low and Black Sagebrush Land Cover (3-km scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Juniper Land Cover (540-m scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Low and Black Sagebrush Land Cover (540-m scale) in the Wyoming Basins Ecoregional Assessment area Proportion of Mixed Shrubland Land Cover (18-km scale) in the Wyoming Basins Ecoregional Assessment area Bicknell's thrush 2080 conductance Saltmarsh sparrow 2080 conductance Blackburnian warbler Climate Refugia 2080 Blackburnian warbler Landscape Capability Moose Climate Refugia 2080 Box turtle Climate Refugia 2080 Saltmarsh sparrow Landscape Capability The Human Footprint in the West Exotic Plant Invasion Risk in the Western United States Populated Areas in the Western United States Soil Depth in the Western United States