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Geographic Variation and Environmental Determinants of Reproductive Output in the Desert Tortoise

The desert tortoise is listed as a threatened species under federal and California versions of the Endangered Species Act. The recovery plan for the desert tortoise recommended that additional data be collected on the reproductive ecology of the species throughout the range. Annual meetings between USGS, Biological Resources Division researchers More...

  • image of an adult male tortoise

Synopsis of Conservation Information on the Desert Tortoise

An overview of the desert tortoise's conservation status in North America: distribution, population declines, current threats, and their protection and recovery.

  • Hatchling tortoises are equipped with small radio transmitters to monitor their movements.

Kemp's Ridley Sea Turtles....An Imperiled Species

Following the Kemp's Ridley on their perilous trek from Padre Island National Seashore, TX, where they are establishing a secondary nesting colony, to the Gulf of Mexico, is tricky business. Satellite transmitters are attached to a select number of females returning to the sea after laying eggs, their movements tracked by receivers picking up the More...

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Ecology of the western pond turtle (Clemmys marmorata) in the Mojave River

This resource is a summary of the research related to the western pond turtle in the Mojave River. The western pond turtle (Clemmys marmorata) is protected by the State of California and recent surveys have confirmed that many populations have been extirpated or are declining, particularly in southern California. Threats to the continued survival More...

  • western pond turtle (Clemmys marmorata)