Date of Graduation
Spring 2019
Degree
Master of Science in Biology
Department
Biology
Committee Chair
Day Ligon
Abstract
The alligator snapping turtle (Macrochelys temminckii), is a species of conservation concern that is the subject of multiple head-start and reintroduction efforts across its range. In captive propagation programs, producing offspring that are in optimal physiological condition maximizes the likelihood of success after release. The purpose of my study was to compare stress and body composition between one free-ranging reintroduced population and two captive populations. The two captive populations were both housed in southern Oklahoma, but one group was reared indoors whereas the other inhabited outdoor ponds at a national fish hatchery. I used circulating glucocorticoid (corticosterone) concentrations as an indicator of stress level and dual-energy X-ray absorptiometry (DXA) to estimate body composition. Corticosterone concentrations did not differ between captive and free-ranging populations, possibly suggesting that corticosterone is a poor predictor of stress in this species or under chronically stressful conditions. DXA accurately and precisely estimated fat mass (FM), lean tissue mass (LTM), and bone mineral mass (BMM). The captive-outdoor and free-ranging populations exhibited greater BMM than the captive-indoor population. However, both captive populations exhibited higher FM and lower LTM than turtles in the free-ranging population. A body condition index calculated by regressing log-transformed mass on length did not correlate with FM or BMM, but did correlate significantly with LTM.
Keywords
Macrochelys temminckii, BCI, dual energy X-ray absorptiometry, stress, corticosterone, stress response
Subject Categories
Aquaculture and Fisheries | Biodiversity | Endocrinology | Integrative Biology | Other Physiology | Population Biology | Zoology
Copyright
© Brandon Scott Tappmeyer
Recommended Citation
Tappmeyer, Brandon Scott, "Stress and Body Composition of Juvenile Alligator Snapping Turtles (Macrochelys temminckii)" (2019). MSU Graduate Theses. 3349.
https://bearworks.missouristate.edu/theses/3349
Open Access
Included in
Aquaculture and Fisheries Commons, Biodiversity Commons, Endocrinology Commons, Integrative Biology Commons, Other Physiology Commons, Population Biology Commons, Zoology Commons