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Respiratory physiology during gravidity in Crotaphytus collaris and Gambelia wislizenii

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/10816

Respiratory physiology during gravidity in Crotaphytus collaris and Gambelia wislizenii

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Title: Respiratory physiology during gravidity in Crotaphytus collaris and Gambelia wislizenii
Author: Gilman, Casey
Advisor(s): Wolf, Blair
Committee Member(s): Toolson, Eric
Brown, James
Department: University of New Mexico. Biology Dept.
Subject: lizard
ventilation
LC Subject(s): Lizards--Respiration
Lizards--Reproduction
Lizards--Eggs
Crotaphytus collaris--Respiration
Leopard lizards--Respiration
Degree Level: Masters
Abstract: During gravidity lizards experience a significant decrease in lung volume as a result of compression by growing eggs within the body cavity. In order to understand the effect of this decrease in lung volume on respiratory physiology of gravid egg-laying lizards I measured changes in: total lung volume, resting and post-exercise expired volume, minute volume, respiratory frequency, and carbon dioxide production during reproduction in Crotaphytus collaris and Gambelia wislizenii. I found that compression of the lungs by eggs resulted in an average 48% (range: 26 to 70%) decrease in total lung volume in C. collaris, and an average 38% (range: 29 to 46%) decrease in G. wislizenii. Despite the significant reduction in lung volume in both of these species, only breathing frequency and rate of CO2 production were significantly altered. Breathing frequency was greatest in both species when females were carrying shelled eggs, and CO2 production rate was greatest in females of C. collaris when they were carrying late-stage follicles. The significant increases in breathing frequency in both species were large enough to compensate for the decrease in lung volume and maintain relatively constant minute ventilation in both species. Crotaphytus collaris and G. wislizenii appear to be able to withstand large changes in lung volume during reproduction with little respiratory compensation.
Graduation Date: May 2010
URI: http://hdl.handle.net/1928/10816


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