MATERIALS AND METHODS Census and Collection Various standard census methods were employed to obtain qualitative and quantiThese tative inventories of lizard and rodent faunas in each NAEG Study Area. of ease in methods varied between vertebrate taxa because of differences capture and observation and have been reported previously (Moor and Bradley, 1974; Moor et al., 1976a). In general, permanent grid systems developed by NAEG in the study sites were used as locations for census and collection of small vertebrates. These grid systems identify the coordinates of Pu and Am activity strata developed from FIDLER surveys and Pu soil analysis (Gilbert et al., 1975). Utilizing ‘capture-recapture techniques and a system of toe-clipping to enable recognition of individual animals, data on population densities, biomass, and seasonal activities were gathered. Rodents were collected in Sherman live traps and lizards were noosed. Data recorded at time of capture included the location of the capture in the grid, species identification, toe clip, sex, relative age, and reproductive condition. The density of small mammals in the trapping grid was estimated using markrecapture methods described by Hayne (1949). The trapping grid was also used to gather data on animal movements in order to establish home ranges based upon recapture locations in the grid. A center of activity was determined for individual animals using individual recapture locations and the relative frequency with which an animal was found at various locations in the grid (Hayne, 1949; Calhoun and Casby, 1958). Centers of activity were then examined in relation to Pu activity strata and distance from GZ. Recapture radii were averaged by sex for each species and were used to estimate home range size and effective trapping area of the grid. When sufficient data to estimate recapture radii for a particular species were not available, data from Jorgensen and Hayward (1965) collected from NTS were utilized from similar areas to estimate home-range diameters. Density estimates were also utilized to compute a species diversity index. The Shannon formula (Shannon, 1948; Pielou, 1966; Lloyd et al., 1968) was used as a general index of species diversity in each Study Area: C N —(N Lo B10 N- n, Log 4 n,) PE oni where C converts logarithms from base 10 to an arbitrary base, N is the total number of individuals of all species, and n, is the number of the th species. In addition to estimates of home range, movements, population densities, and trophic components found in the Study Areas, data gathered were utilized for 195