Effect of temperature on osmotic regulation in Larval Ambystoma gracile Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/wm117s57g

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  • Temperature effects on osmoregulation were studied in larval Ambystoma gracile. There was a pronounced effect on the osmotic uptake of water through the skin. The rates at 5°C, 15°C and 25°C were respectively 0.03 ml/hr., 0.1 ml/hr. and 0.2 ml/hr. for a 10g animal. The Q₁₀'s for these changes in rate are larger than would be expected for simple diffusion, which indicates that an active regulation is causing an increase in the permeability of the skin with a temperature increase. There was no gross change in the body weight at any temperature studied, indicating that the water loss was closely regulated. A possible mechanism for water regulation is discussed as well as the possibility of hormonal control over this mechanism. Temperature also has an effect on net potassium loss. The losses at 5°C, 15°C and 25°C were 0.09 μeq/10g hr., 0.23 μeq/10g hr. and 0.48 μeq/10g hr. These changes are comparable to the change in the rate of uptake of water. This indicates that there is a general change in the permeability of the skin to both salts and water with a change in temperature. Sodium and chloride were fully regulated at all temperatures studied. Sodium fluxes were obtained using radioactive sodium. There was no difference in the flux values obtained from animals acclimated at 15°C and 25°C, the rates were 1.7 μeq/10g hr. At 5°C the flux values dropped to 0.7 μeq/10g hr. Reasons are given indicating that a temperature increase causes: (1) a decrease in the activity of the sodium uptake across the skin and gills and (2) an increase in the activity of the sodium uptake across the tubular epithelium. Possible hormonal control of these responses is also discussed.
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