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Bio
Since retiring in 2006 and becoming a Research Professor, my research has moved away from Physiological Ecology and into the area of Conservation Biology. Specifically, my current work concerns the Threatened species Gopherus agassizii, the Desert Tortoise. We are doing Head-start studies at several specially-built hatchery-nursery installations located in natural habitat on military bases in the Mojave Desert of California. These projects involve protecting tortoise nests, eggs and juveniles from predators until they are big enough or old enough to fend for themselves, then they are released into the wild. We are examining many aspects of head-starting, including possible transmission of diseases from mother to eggs, ways to enhance growth so young tortoises can be released sooner, the possible involvement of temperature-dependent sex determination, minimum age/size needed for good survivorship of juveniles after release, best ways to handle egg-donor females to promote their continued survivorship and fecundity, and successful protocols (when, where, how) for releasing juveniles. The main goal is to overcome the 90-99 percent mortality that occurs in the early years of life among wild desert tortoises under natural conditions, and thereby make available many more sub-adult tortoises for recruitment. This strategy should help tortoise populations recover.
Research Interests
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CANADIAN JOURNAL OF ZOOLOGYno. 2 (2016)
mag(2013)
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