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Development of oil and gas wells leads to the destruction and fragmentation of natural habitat. Oil and gas wells also increase noise levels which has been shown to be detrimental to some wildlife species. Therefore, the density of oil and gas wells in the western United States was modeled based on data obtained from the National Oil and Gas Assessment.
Density of linear features, such as roads, power lines, telephone lines, and railroad tracks have been shown to influence synanthropic predator abundance patterns (Knight et al. 1995). Following Knight et al. (1995), we used linear features such as roads, railroads, and power line spatial data sets, but also included irrigation canals, to build a linear features spatial data set. However, we lacked spatial data on telephone and feeder-power lines and therefore our linear feature spatial data set vastly underestimates the number of linear features in some areas.
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.
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.
Locations of landfills and waste transfer stations in 11 western states. Data was obtained from state and federal agencies in GIS, tabular, and map format.
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We evaluated the fragmentation of the western United States by anthropogenic features. The addition of roads, railroads, and power lines to wildlands, and the conversion of wildlands to agricultural land and/or urban areas, induces fragmentation. We used the following spatial data sets to model anthropogenic fragmentation: agricultural land, populated areas, power lines, railroads, and roads. Because we were interested in the spatial arrangements of wildland patches and how anthropogenic fragmentation affects wildlife dispersal, we buffered some of these spatial data sets according to their area of influence. For example, the area of influence of interstate highways extends beyond the traffic lanes (Rowland et al....
    map background search result map search result map All Roads in the Western United States All Interstates and State and Federal Highways in the Western United States Canals in the Western United States Anthropogenic Fragmentation in the western United States All Interstates in the Western United States Landfills in the Western United States Density of Line Features in the Western United States Oil and Gas Well Density in the Western United States Populated Areas in the Western United States Populated Areas in the Western United States All State and Federal Highways in the Western United States Density of Line Features in the Western United States Landfills in the Western United States All Interstates in the Western United States Canals in the Western United States All State and Federal Highways in the Western United States All Interstates and State and Federal Highways in the Western United States All Roads in the Western United States Oil and Gas Well Density in the Western United States Anthropogenic Fragmentation in the western United States Populated Areas in the Western United States Populated Areas in the Western United States