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OSMOTIC AND METABOLIC RESPONSES TO DEHYDRATION AND UREA-LOADING IN A TERRESTRIALLY-HIBERNATING FROG

Muir, Timothy J
http://rave.ohiolink.edu/etdc/view?acc_num=miami1182977656

Abstract Details

2007, Master of Science, Miami University, Zoology.
Physiological responses to dehydration in amphibians are reasonably well documented, although little work has addressed this problem in hibernating animals. We investigated osmotic and metabolic responses to experimental manipulation of hydration state in the wood frog (Rana sylvatica). In winter-conditioned frogs, plasma osmolality varied inversely with body water content primarily due to increases in sodium and chloride concentrations, as well as de novo synthesis of glucose and urea. Decreased hydration was accompanied by a marked reduction in the resting rate of oxygen consumption, which was inversely correlated with plasma osmolality and urea concentration. Resting rates of oxygen consumption in fully-hydrated frogs receiving injections of saline or saline containing urea did not differ initially; however, upon dehydration, metabolic rates decreased sooner in the urea-loaded frogs than in control frogs. Our findings suggest an important role for urea, acting in concert with dehydration, in the metabolic regulation of hibernating R. sylvatica.
Richard Lee (Advisor)
FROG; urea; sylvatica; osmolality; DEHYDRATION; plasma osmolality; osmolytes

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Citations

  • Muir, T. J. (2007). OSMOTIC AND METABOLIC RESPONSES TO DEHYDRATION AND UREA-LOADING IN A TERRESTRIALLY-HIBERNATING FROG [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1182977656

    APA Style (7th edition)

  • Muir, Timothy. OSMOTIC AND METABOLIC RESPONSES TO DEHYDRATION AND UREA-LOADING IN A TERRESTRIALLY-HIBERNATING FROG. 2007. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1182977656.

    MLA Style (8th edition)

  • Muir, Timothy. "OSMOTIC AND METABOLIC RESPONSES TO DEHYDRATION AND UREA-LOADING IN A TERRESTRIALLY-HIBERNATING FROG." Master's thesis, Miami University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=miami1182977656

    Chicago Manual of Style (17th edition)

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© 2007, all rights reserved.
This open access ETD is published by Miami University and OhioLINK.