Letter | Published:

Seasonal Changes in the Blood and Thyroid of the Grass Snake, Natrix natrix

Naturevolume 207pages779780 (1965) | Download Citation

Subjects

Abstract

CHEMICAL and physical changes in the blood during both natural hibernation and experimental hypothermia have been followed in a number of mammalian species1. Similar investigations do not appear to have been extended in any detail to the reptiles, although fish and amphibians have received some attention. The grass snake is less active during the winter, and this condition is often referred to as torpor. In preliminary investigations carried out in this laboratory during 1961, the blood from five specimens, which had entered normal winter torpor in a vivarium, was analysed in February. The ambient temperature was 7° C and some intermittent activity was observed. In July of the same year eleven specimens were available for analysis, the ambient temperature being 18° C. The results, together with comparable data on the hedgehog1, are presented in Table 1.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Kayser, C., The Physiology of Natural Hibernation (Pergamon Press, London, 1961).

  2. 2

    Uotila, U., and Kannas, O., Acta Endocrinol., 11, 49 (1952).

  3. 3

    Barrington, E. J. W., and Matty, A. J., Proc. Zool. Soc. Lond., 124, 89 (1954).

Download references

Author information

Affiliations

  1. Department of Zoology, Royal Holloway College, University of London, Englefield Green, Surrey

    • E. J. BINYON
    •  & G. I. TWIGG

Authors

  1. Search for E. J. BINYON in:

  2. Search for G. I. TWIGG in:

About this article

Publication history

Issue Date

DOI

https://doi.org/10.1038/207779a0

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.