other purposes. Aboveground activity of each species in each area was based on the relative number of individuals captured seasonally; reproductive status and recruitment were estimated by the percentage of the populations which were described as either sexually active adults, sexually inactive adults, young adults, or immatures. Radioanalysis Individual animals known to be residents in the Study Areas for at least three months were captured, sacrificed, and taken to the CETO building in Mercury, where they were autopsied. Animals were also collected off-site for analysis following the same procedures used in NAEG Study Areas. Tissue aliquots for radioassay included pelt or skin, GI tract, and carcass. Laboratory procedures for preparation of tissue samples have been reported (Moor and Bradley, 1974; Moor et al., 1976b) and included dipping animals in hot paraffin wax to minimize Levels of 239py and 241Am cross-contamination between respective aliquots. in the tissue samples were determined by LFE Environmental Analysis Laboratories. Hematological Studies The following procedures were used to obtain baseline hematological data from animals collected off-site and in NAEG Intensive Study Areas. Animals were captured alive utilizing Sherman live traps or nooses and returned to the laboratory, either CETO or UNLV, and examined within 24 hours of capture. Blood was obtained from lizards by decapitation without anesthetic and was obtained from rodents by cardiac puncture using ethyl ether as an anesthetic. In all instances, blood was collected in heparinized (ammonium sulfate) syringes. All analyses were done in duplicate, and any test exceeding a 1% difference -was repeated. All analyses were done following standard methods (Hepler, 1966). Differential Stain--Blood smears were prepared on clean slides and allowed to air dry. Slides were then fixed with Wright's stain. One hundred cells were counted and identified using the 4-field meander method, beginning at the margin of the smear and counting toward the center and then to the margin alternately. Hemoglobin--The cyanmethemoglobin method was used for hemoglobin determination. To 5.0 ml Drabkins solution, 0.02 ml of whole blood was added. Hemoglobin is converted to cyanmethemoglobin by the Drabkins solution which contains ferricyanide and cyanide. The resultant color is indicative of hemoglobin concentration which was read on a Fisher Flo-thru Hemophoto- meter in gm/100 ml or Bausch and Lomb Spectronic 20. Packed Cell Volume--The packed cell volume (PCV) is a measurement of percentage of red blood corpuscles in whole blood. Precalibrated 75 mm heparinized micro-hematocrit tubes were centrifuged in an Adam's Readacrit Centrifuge at 8500 rpm for five minutes and PCV measured on the built-in reader (1-100%). 196