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dc.contributor.authorBallou, Ashley Rose
dc.date.accessioned2014-03-04T21:00:44Z
dc.date.available2014-03-04T21:00:44Z
dc.date.issued2013-05
dc.identifier.otherballou_ashley_r_201305_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/ballou_ashley_r_201305_ms
dc.identifier.urihttp://hdl.handle.net/10724/28654
dc.description.abstractI estimated gopher tortoise population sizes using line transect distance sampling on 17 sites in Georgia, and studied whether burrow width affects detection probability. I used tortoise density data to determine which site and landscape variables affect tortoise population density. I also studied a juvenile tortoise population in southwestern Georgia to test the accuracy of juvenile gopher tortoise burrow scopes, compare juvenile and adult tortoise burrow occupancy and evaluate a new method for tracking juvenile tortoises. Population size estimates among sites ranged from 89 (95% CI: 61-129) to 1877 (95% CI: 1485-2372). I found that detection probability decreased with decreasing burrow width, from 0.78 for burrows > 23 cm to 0.67 for burrows < 12 cm in width. The best model to predict tortoise densities was the model that included evergreen and mixed forest within sites and road density in the surrounding landscape. The juvenile burrow scope was highly accurate (occupancy of 96.7% of burrows was determined correctly), and juveniles had a significantly higher burrow occupancy rate (77%) than adults (40%). Finally, I found that fluorescent powder tracking was a simple and inexpensive method for tracking juvenile gopher tortoises.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjecttortoise
dc.subjectpopulation
dc.subjectline transect distance sampling
dc.subjectdetection probability
dc.titleAspects of gopher tortoise (Gopherus polyphemus) populations in Georgia
dc.title.alternativestatus, landscape predictors, juvenile movements and burrow use
dc.typeThesis
dc.description.degreeMS
dc.description.departmentDaniel B. Warnell School of Forestry and Natural Resources
dc.description.majorForest Resources
dc.description.advisorSteven B. Castleberry
dc.description.committeeSteven B. Castleberry
dc.description.committeeLora L Smith
dc.description.committeeJeffrey A. Hepinstall


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