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XIII.—Cytological Studies on the Reproductive Organs. Chromosome Behaviour in the Male Grey Squirrel (Sciurus carolinensis leucotus)

Published online by Cambridge University Press:  15 September 2014

P. C. Koller
P. C. Koller
Affiliation:
Institute of Animal Genetics, University of Edinburgh
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Extract

The grey squirrel (Sciurus carolinensis leucotus Gapper), which is a native of the North American continent, was introduced into England and Scotland quite recently and soon became of great economic importance in these countries. In his very excellent monograph, Middleton (1930) states that both sexes of the grey squirrel show diminished activity during the winter and while they do not hibernate in the true sense of the word, they probably sleep if the weather is severe. The breeding habits of the female were studied by Deanesly and Parkes (1933), who ascertained that the female definitely has a period of anœstrus during which the reproductive organs are atrophic. In the male, however, fully functional testes were found throughout the year (Allanson, 1933), and there were no histological changes which would indicate a regular period of quiescence.

Type
Proceedings
Information
Proceedings of the Royal Society of Edinburgh , Volume 56 , 1937 , pp. 196 - 209
Copyright
Copyright © Royal Society of Edinburgh 1937

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References

References to Literature

Allanson, M., 1933. “Changes in the Reproductive Organs of the Male Grey Squirrel (Sciurus carolinensis),” Phil. Trans. Roy. Soc., B, vol. ccxxii, pp. 79–96.Google Scholar
Cross, J. C., 1931. “A Comparative Study of the Chromosomes of Rodents,” Journ. Morph. Phys., vol. lii, pp. 373–402.CrossRefGoogle Scholar
Darlington, C. D., 1932. Recent Advances in Cytology. London: Churchill.Google Scholar
Darlington, C. D., 1935 a. “The Internal Mechanics of the Chromosomes,” Proc. Roy. Soc. London, B, vol. cxviii, pp. 33–96.Google Scholar
Darlington, C. D., 1935 b. “The Time, Place and Action of Crossing-over,” Journ. Genetics, vol. xxxi, pp. 185–212.CrossRefGoogle Scholar
Deanesly, R., and Parkes, A. S., 1933. “The Œstrus Cycle of the Grey Squirrel (Sciurus carolinensis),” Phil. Trans. Roy. Soc., B, vol. ccxxii, pp. 47–78.Google Scholar
Koller, P. C., 1936. “The Origin and Behaviour of Chiasmata: XI. Marsupials,” Cytologia, vol. vii (in press).Google Scholar
Mather, K., 1936. “Competition between Bivalents during Chiasma Formation,” Proc. Roy. Soc., B, vol. cxx, pp. 208–227.Google Scholar
Middleton, A. D., 1930. “The Ecology of the American Grey Squirrel (Sciurus carolinensis Gmelin) in the British Isles,” Proc. Zool. Soc. London, pp. 809–843.CrossRefGoogle Scholar