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Changes in body water and plasma constituents during bullfrog development: Effects of temperature and hormones

✍ Scribed by Brown, Stephen C. ;Horgan, Elizabeth A. ;Savage, Lynne M. ;Brown, Patricia Stocking

Publisher: John Wiley and Sons
Year: 1986
Tongue: English
Weight: 695 KB
Volume: 237
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1402370106

No coin nor oath required. For personal study only.

✦ Synopsis

The osmoregulatory responses to warmer temperatures and hormone treatment in cold-adapted (5" C) Rana catesbeiana tadpoles and newly metamorphosed frogs were examined. Tadpoles transferred to 11" C and 18" C and left for 5 days lost 7% and 10% of their body weight. Plasma "a+] was elevated 28% and 21%, respectively. Control (5" C) animals maintained their body weight and plasma "af] constant. Daily treatment with either ovine prolactin (oPRL) or ovine growth hormone (oGH) prevented the weight loss and the increase in extracellular "af] that occurred when tadpoles were transferred to 18" C. Neither propylthiouracil (PTU) nor arginine vasotocin (AVT) were effective in countering temperature-induced weight loss in tadpoles.

Newly metamorphosed frogs transferred to 18" C also lost weight; this was not prevented by daily treatment with saline, oPRL, oGH or PTU. However, in frogs treated daily with AVT, initial BW was regained by day 6. When warm-

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