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Physiological Responses to Temperature in the Lizard, Sceloporus Undulatus

Show simple item record Ehrenberger, Joseph C. 2010-07-20T14:21:37Z 2015-10-01T13:47:27Z 2010-07-20T14:21:37Z 2015-10-01T13:47:27Z 2010-07-20T14:21:37Z
dc.description.abstract Temperature affects all organisms differently. Physiological processes, such as metabolism, interact with temperature to determine a minimal rate of energy loss. Physiological limits, such as heat and cold tolerances, likely constrain the activity and survival of organisms. Ultimately, these physiological processes and limits determine a species‘ geographical distribution. Through experiments, I sought to understand specifically how temperature affects the physiology of the lizard Sceloporus undulatus. This species is a model organism to answer such questions, as it is geographically widespread species and well-described phylogenetically. In the first experiment, I compared standard metabolic rates of lizards from three locales and interpreted these rates in the context of the metabolic theory of ecology—a set of models that describes the effects of body mass and body temperature on metabolic rate. My findings indicate that metabolic rate increases with body size, but that the exact nature of this relationship depends on temperature; this result contrasts a major assumption of the metabolic theory of ecology, which stresses the need to evaluate this theory through by examining intraspecific variation. In my second experiment, I measured the preferred body temperatures and critical thermal limits of S. undulatus. Existing theory indicates that physiological traits associated with temperature may be evolutionary static or labile. By measuring these traits from seven populations, which cover the majority of this species‘ range, I have provided one of the most comprehensive comparisons of thermal physiology in a single biological species. My results are consistent with the static view of thermal physiology, suggesting that thermal physiology has not adapted to local conditions in this species.
dc.description.statementofresponsibility Joseph C. Ehrenberger
dc.language.iso en_US
dc.subject.lcsh Sceloporus undulatus.
dc.subject.lcsh Reptiles--Metabolism.
dc.subject.lcsh Body temperature--measurement.
dc.subject.other Metabolic theory of ecology.
dc.subject.other Thermal physiology.
dc.subject.other Body mass.
dc.title Physiological Responses to Temperature in the Lizard, Sceloporus Undulatus
dc.type Thesis May 2010
dc.description.committeechair Angilletta, Michael J.
dc.description.committeemembers Steven L. Lima
dc.description.committeemembers William A. Mitchell Master of Science
dc.description.department Department of Biology
dc.description.imprint Cunningham Memorial library, Terre Haute,Indiana State University
dc.description.itemidetd GS071610-201001
dc.description.level Masters
dc.description.note Title from document title page. Document formatted into pages: contains 48 p.: ill. Includes abstract.

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