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Physiological ecology of desert tortoises in southern Nevada
Tortoises apparently relinquish maintenance of internal homeostasis on a daily basis during most of the year, while tolerating large imbalances in their water, energy and salt budgets.
Field trials of line transect methods applied to estimation of desert tortoise abundance
Line transect sampling represents a viable method for large-scale monitoring of populations of desert tortoises; however, field protocol must be improved to assure the key assumptions are met.
Return to the wild: Translocation as a tool in conservation of the desert tortoise ( Gopherus agassizii )
The results indicate that translocation should be considered a useful tool in conservation of the Desert Tortoise and lengthy movements following translocation may be problematic for conservation planning, but this should be evaluated in light of the goals and circumstances of each translocation project.
Translocation as a conservation tool for Agassiz's desert tortoises: Survivorship, reproduction, and movements
Tortoises translocated into typical Mojave desert scrub habitats perform well; however, the large first-year movements of translocated tortoises have important management implications, and projects that employ translocations must consider how much area will be needed to contain translocated animals and whether roads need fencing to prevent the loss of animals.
Effects of subsidized predators, resource variability, and human population density on desert tortoise populations in the Mojave Desert, USA.
It is hypothesized that low population levels of typical coyote Canis latrans prey (i.e. jackrabbits Lepus californicus and other small animals) due to drought conditions influenced high predation rates in previous years, which may have been exacerbated in areas with high levels of subsidized predators.
Range and habitats of the desert tortoise
Integration of genotoxicity and population genetic analyses in kangaroo rats (Dipodomys merriami) exposed to radionuclide contamination at the Nevada Test Site, USA.
- C. Theodorakis, J. Bickham, T. Lamb, P. Medica, T. Lyne
- Biology, MedicineEnvironmental toxicology and chemistry
- 1 February 2001
The atomic blast sites are ecological sinks and that immigration masks the genotoxic effects of radiation on the resident populations, and the observed predominance of migration events into the contaminated sites supported the migration hypothesis.
Are Wildlife Detector Dogs or People Better at Finding Desert Tortoises (Gopherus Agassizii)
Dog teams provided a quick and effective method for surveying for adult Desert Tortoises; however, they were unable to determine their effectiveness at locating smaller size classes, which would improve management of the species.
Reproduction and survival of the desert tortoise (Scaptochelys agassizii) in Ivanpah Valley, California
Analyses of tortoise feces showed that grasses were eaten with equal frequency until mid-May in both years, but that after this time grasses essentially disappeared from 1981 diets, which may partially explain the egg production in 1981-one of the most unfavorable years on record in the Mojave Desert.