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Renal excretion of urea in the salamander, Ambystoma tigrinum

✍ Scribed by Stiffler, Daniel F. ;Hawk, C. Terrance ;Fowler, Beth C.

Publisher: John Wiley and Sons
Year: 1980
Tongue: English
Weight: 667 KB
Volume: 213
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1402130207

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✦ Synopsis

Renal excretion of urea was assessed in adult and larval Ambystoma tigrinurn by comparing simultaneous clearances of urea and inulin. The mean adult urea clearance ratio (Cu/C,,) was 0.70 2 0.08 indicating net urea absorption. Larvae yielded a mean CV/CI, of 0.92 2 0.04. Individual larvae were quite variable however as approximately 30% displayed Cu/CI, > 1. There was a significant negative correlation between Cu/Cln and fractional water reabsorption. Comparisons of larval kidney urea concentration (K,) and plasma urea concentration (P,) revealed a mean K,P, of 1.43 & 0.15. Treatment with 2,4-dinitrophenol decreased

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