Summer and winter cycles in plasma melatonin levels in the elephant seal (Mirounga Leonina)

• Published in: Australian Journal of Biological Sciences
• Main Authors: Griffiths, D., Bryden, M. M., Seamark, R. F.
• Format: Article in Journal/Newspaper
• Language: English
• Published: CSIRO Publishing 1979
• Subjects: Biotechnology; Developmental Biology; Animal Science and Zoology; General Materials Science; Genetics; Molecular Biology; Endocrinology; Reproductive Medicine; General Medicine; 2700 Medicine; Midwinter; Elephant Seal; Elephant Seals; Mirounga leonina
• Online Access: https://espace.library.uq.edu.au/view/UQ:ba241f9

Plasma melatonin concentration of immature male elephant seals was determined by radioimmunoassay. Comparison of concentrations during two 24-h periods, one in midsummer and one in midwinter, showed that there was a marked circadian cycle in winter which was greatly modified during the long day leng...