Elevation Range Mean Annual Temperature Annual Temperature Range Total Annual Precipitation Percent Tree Cover Percent Herbaceous Cover Anthropogenic Variables: Human Population Density Total Protected Area Percent Urban Cover Percent Cropland Cover Percent Ag Mosaic Cover Spatial Resolutions Range from 500m to 5km MODIS VCF Tree Cover Landscan Population Density
Axis = Annual Temperature Range Dot size = Ecoregion Area X Axis = Herbaceous vegetation Cover X Axis = Cropland Cover Y Axis = TVSR Are relationships explaining Terrestrial Vertebrate Species Richness (TVSR) spatially non-stationary?
by similar combinations of factors? Geographically-Weighted Regression (GWR) on the attributes and locations of the ecoregion polygons “GWR is a method of analyzing spatially-varying relationships. [It is] is a technique for exploratory spatial data analysis.” - From Fotheringham et al. http://ncg.nuim.ie/ncg/GWR/
•Ag Mosaic Density (0.25) •Human Population Density (0.24) •Mean Annual Temp (0.33) •Significant Positive Explanatory Variables: •Mean Elevation (0.27) •Elevation Range (0.28) •Tree Cover Density (0.23) •Herbaceous Cover Density (0.23) •Precipitation total (0.30) •Protected Area (0.26) •Temp annual range (0.45) BDZ #5: Don’t Crowd Me