Seasonal patterns of plasma steroid hormones in males and females of the beaded dragon lizard, Pogona barbata

Amey, Andrew P. and Whittier, J. M. (2000) Seasonal patterns of plasma steroid hormones in males and females of the beaded dragon lizard, Pogona barbata. General and Comparative Endocrinology, 117 3: 335-342. doi:10.1006/gcen.2000.7426


Author Amey, Andrew P.
Whittier, J. M.
Title Seasonal patterns of plasma steroid hormones in males and females of the beaded dragon lizard, Pogona barbata
Formatted title
Seasonal patterns of plasma steroid hormones in males and females of the beaded dragon lizard, Pogona barbata
Journal name General and Comparative Endocrinology   Check publisher's open access policy
ISSN 0016-6480
1095-6840
0435-2440
Publication date 2000-03
Sub-type Article (original research)
DOI 10.1006/gcen.2000.7426
Volume 117
Issue 3
Start page 335
End page 342
Total pages 8
Editor Frank Moore
Ian Henderson
Place of publication New York, NY, U.S.A.
Publisher Academic Press
Collection year 2000
Language eng
Subject C1
270603 Animal Physiology - Systems
780105 Biological sciences
Formatted abstract
Pogona barbata is an Australian lizard that produces several large clutches of eggs between August and December (spring to early summer). Mating takes place around ovulation. The seasonal pattern of reproductive hormones in males and females of P. barbata was determined by radioimmunoassay of plasma progesterone (P), estradiol-17β (E-17β), corticosterone (B), and total androgen (TA). In females, P began to rise in August and was elevated from September to December. Corticosterone and TA were detectable but low and did not vary with time of year or reproductive condition. Estradiol-17β was only detectable in a few females and exhibited no elevation with vitellogenic activity. These results suggest that B and TA are not involved in female reproduction. Estrogens may be either so low they could not be detected or they were present in a form other than estradiol-17β. The high sensitivity of the estradiol-17β radioimmunoassay suggests the latter. In males, TA peaked at the beginning of spring. They then declined to a minimum during November and December. However, concentrations recovered in the postbreeding activity period, January to April (summer and autumn). These patterns are consistent with the observation of maximum spermatogenic activity in spring, followed by the cessation of spermatogenesis directly after the breeding period and testicular recrudescence in February (late summer).
© 2000 Academic Press
Keyword Pogona barbata
Agamidae
Reproductive endocrinology
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biomedical Sciences Publications
 
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Created: Tue, 10 Jun 2008, 12:32:44 EST