Feral House Cat Presence in Western U.S.
Couple days ago, found this interesting material had gone online about the Human Footprint Project which details how "humans have dramatically altered wildlands in the western United States over the past 100 years." It includes input models of the distribution of house cats and feral dogs. In 2001 I had saved an early United States Geological Survey (USGS) reference and map called Non-native animals on public lands published in 1995 which included feral cats; it's no longer online.
[ synanthropic = ecologically associated with humans
according to Merriam Webster ]
Probability of Synanthropic Feral House Cat Presence in the Western United States
Originator: Steve Hanser and Matthias Leu, USGS-FRESC, Snake River Field Station
This model is based on how house cats utilize wildlands near human habituation. These predators can have detrimental effects on wildlife populations (Alterio et al. 1998). We based our model on the data collected by Odell and Knight (2001) that investigated habitat utilization of these predators with regard to distance from housing and on the probability for a homeowner to possess a house cat. We buffered the populated areas distance layer in ARC/INFO using a probability function [P = 0.216 - 0.96 * Distance (km)] where any cell with distance less than 0.18km received a probability between 0.216 to 0. All distances greater than or equal to 0.18km from populated areas were assigned a probability of 0. The resulting dataset was then resampled to 180m using the bilinear interpolation option.
Model the distribution of house cats throughout the western United States.
Leu, M., S.E. Hanser, S.T. Knick. 2008. The human footprint in the west: a large-scale analysis of anthropogenic impacts. Ecological Applications 18(5): 1119-1139.
Found the above information in SAGEMAP - A GIS Database for Sage-grouse and Shrubsteppe Management in the Intermountain West
The SAGEMAP project, conducted by the Snake River Field Station (SRFS) of the USGS Forest and Rangeland Ecosystem Science Center, is identifying and collecting spatial data layers needed for research and management of sage grouse and shrubsteppe systems.