Seasonal variation of newt forelimb regeneration under controlled environmental conditions
✍ Scribed by Schauble, Muriel K.
- Publisher
- John Wiley and Sons
- Year
- 1972
- Tongue
- English
- Weight
- 377 KB
- Volume
- 181
- Category
- Article
- ISSN
- 0022-104X
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✦ Synopsis
Abstract
Forelimb regeneration studies using the newt, Notophthalmus viridescens, were done under constant environmental conditions at 20°C. A series of three‐month regenerative studies were done during a two and one‐half year period. Under conditions which eliminated factors known to affect regeneration, such as temperature and variation in light‐dark cycle, a significant seasonal variation in the regenerative process was found. The rate and amount of regenerative new growth during the summer was enhanced over that in winter. A series of repetitive regenerations in the same group of animals demonstrated that this variation was cyclic under controlled environmental conditions for long periods of time. It is suggested that a cyclic biologic rhythm, probably endocrine in nature, is responsible for the phenomenon.