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-Fifty-seven individual plasma samples from desert tortoises (Xerobates aga.ssizi) representing 10 separate populations were analyzed by polyacrylamide gel electrophoresis using alkaline buffers. An albumin·like protein was found to be polymorphic for two electromorphs in northem populations inbabiting the Mohave Desert Province, wlliJe Sonoran Desert populations to the south were monomorphic. The genetic divergence demonstrated in this survey is similar to earUer studies and provides evidence for the Colorado River as a potential barrier to gene flow among tortoise populations. These data suggest that tortoise plasma, examined by various electrophoretic methods, Ulay prOVide a nondestructive means ofdetermining the broad regional origin ofdesert tortoises. Desert tortoises (Xerabates agassizi) presently inhabit two regions of southwestern Utah, separated east and west by the Beaver Dam Mountains. The population dynamics of the Beaver Dam Slope tortoises (west of the mountains) have been severely impacted by both human and animal activities during the past several decades. Despite both federal and state protective regulations, tortoise numbers in the slope region are probably at an all-time low (Mike Coffeen, UDWR, personal communication). Two stable populations near St. George, east of the Beaver Dam Moun: tains, face new human development projects that threaten the future of these previously isolated populations. The eastern populations are found in Paradise and City Creek canyons, and relocation of some tortoises from these populations is presently under consideration by the Utah DivisiOn of Wildlife Resources. However, several relocation issues remain unresolved, including methods of collection, conditioning, transport, sex ratios, and specimen numbers involved. One problem to be addressed is the question of genetic compatibility of Utah's tortoise populations, especially if any of the tortoises east of the Beaver Dam Mountains are translocated to the western slope. Few data are available comparing the physiology or morphology of Utah's separate lortoise populations. Rainboth et al. (1989) electrophoretically analyzed whole blood homogenates of 146 desert tortoises from two separate localities in California for alIozyme expression at 23 loci. The two populations were quite similar, as each locality contained unique elements only when alIozyrne combinations were used and there was a considerable degree ofoverlap in allozyme frequency. Lamb et al. (1989) included five tortoises from Paradise Canyon in an analysis of phylogeographie patterns in mitochondrial DNA (mtDNA) of the gopher tortoise complex. Their data indicated that these individuals fit within an eastern Mohave «clone" representing the northern Arizona and eastern Nevada region. Also, Jennings (1985) included five tortoises from the Beaver Dam Slope region IVen,otO Research. Laboratory, Veten,ns AdmJoirlnltiQn MedOl Center, Sill.~e aty. Utah 84146. 'Hogle Zoological Car<:kns, Salt Ltire Cfty, Utah 84148. 3DepartmentofZoology, Brigh.m Young Univemty, ProI'O, lJW! 8460Z.

A plasma protein marker for population genetic studies of the desert tortoise (Xerobates agassizi)