patterns of mammalian occurrence and relative abundance

Figure 1. Schematic describing a) spatial distribution of all observations of raccoons in 2004 across full study area; 9 observations of raccoons in b) one 16-mi2 study block (i.e., a density of 0.56 raccoons per mile, 100% occupancy), c) 4 4-mi2 study blocks, ranging in density from 0.25 to 1.25 raccoons per mi2, 100% occupancy, and d) 16 1-mi2 study blocks, with observed density ranging from 0 to 3 raccoons per mi2, 31.25% occupancy. The histogram (e) of the number of raccoons/cell indicates an increasing skew toward a greater proportion of unoccupied cells as cell resolution becomes increasingly fine.