*Zoofysiologisk Institutt, Universitetet i Oslo, Postboks 1051, Blindern, Oslo 3, Norway.
The annual cycle of the testis of the elephant seal (Mirounga leonina) at Macquarie Island
Article first published online: 20 AUG 2009
Journal of Zoology
Volume 203, Issue 2, pages 193–204, June 1984
How to Cite
Griffiths, D. J. (1984), The annual cycle of the testis of the elephant seal (Mirounga leonina) at Macquarie Island. Journal of Zoology, 203: 193–204. doi: 10.1111/j.1469-7998.1984.tb02326.x
- Issue published online: 20 AUG 2009
- Article first published online: 20 AUG 2009
- Accepted 11 October 1983
The testis of the Southern elephant seal demonstrates seasonal changes in weight, with highest values early in the breeding season (September-November) and lowest values in mid-winter (May-June). Weight changes originate in the seminiferous tubules, there being little variation in the interstitial tissue.
Spermatogenesis begins in August, one month before the breeding season, and stops in November. Testicular testosterone concentration is significantly elevated in the months July-September. Plasma testosterone concentration is high only in September, the first month of breeding.