eCite Digital Repository

Seasonal variations in reproductive hormones in free-ranging echidnas (Tachyglossus aculeatus): Interaction between reproduction and hibernation

Citation

Nicol, SC and Andersen, NA and Jones, SM, Seasonal variations in reproductive hormones in free-ranging echidnas (Tachyglossus aculeatus): Interaction between reproduction and hibernation, General and Comparative Endocrinology, 144, (3) pp. 204-210. ISSN 0016-6480 (2005) [Refereed Article]

DOI: doi:10.1016/j.ygcen.2005.05.013

Abstract

We measured the reproductive steroids testosterone and progesterone in free-ranging adult echidnas over several years. For months other than June-August, the mean progesterone concentration was 0.18 ± 0.12 ng ml-1 (n = 14), and all blood samples taken from active female echidnas in June-August had progesterone concentrations above 0.5 ng ml -1. The highest progesterone value measured was 13.4 ng ml -1 in a pregnant female several days before egg-laying. For months other than June-August the mean testosterone concentration was 0.09 ± 0.05 ng ml-1 (n = 13). During June-August all active sexually mature males had testosterone concentrations in excess of 0.2 ng ml-1 and were found in mating groups at some time during this period. The highest plasma testosterone concentration measured was 4.62 ng ml-1. © 2005 Elsevier Inc. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Physiology
Research Field:Comparative Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Nicol, SC (Associate Professor Stewart Nicol)
Author:Andersen, NA (Dr Niels Andersen)
Author:Jones, SM (Professor Susan Jones)
ID Code:38072
Year Published:2005
Web of Science® Times Cited:14
Deposited By:Anatomy and Physiology
Deposited On:2005-08-01
Last Modified:2007-10-11
Downloads:0

Repository Staff Only: item control page