OBSERVATIONS ON KIDNEYS OF DESERT AND SWAMP ANIMALS I. PLASMA AND URINE OSMO¬LALITY IN SOME DESERT AND SWAMP-DWELLING MAMMALS

摘要

Urine and plasma osmolalities were determined by cryoscopy in deermice (Peromyscus) and rabbits (Sylvilagus) from arid and humid environments. Rabbits in "wet" environmental cages produced urine of 390 to 1200 milliosmoles/liter. Those deprived of water produced urine of 800 to 1250 milliosmoles/liter, and those given ADH in addition produced urine of 1300 and 1500 milliosmoles/liter. Desert cottontails during the dryest season produced urine of 1100 to 2450 milliosmoles/liter. Plasma osmolalities in all rabbits ranged from 300 to 430 milliosmoles/liter with only two cases in eleven exceeding 350 milliosmoles/liter.nDry season desert deermice showed plasma osmolalities from 500 to 900 milliosmoles/liter while those examined during the relatively moist season showed plasma osmolalities from 375 to 420 milliosmoles/liter.