Journal of Comparative Physiology A

, Volume 195, Issue 7, pp 619–630 | Cite as

Sex steroid correlates of female-specific colouration, behaviour and reproductive state in Lake Eyre dragon lizards, Ctenophorus maculosus

Original Paper

Abstract

In some species, females develop bright colouration to signal reproductive status and exhibit behavioural repertoires to incite male courtship and/or reduce male harassment and forced copulation. Sex steroids, including progesterone and testosterone, potentially mediate female reproductive colouration and reproductive behaviour. We measured associations among plasma profiles of testosterone and progesterone with variation in colour expression and reproductive behaviour, including unique courtship rejection behaviours, in female Lake Eyre dragon lizards, (Ctenophorus maculosus). At onset of breeding, progesterone and testosterone increased with vitellogenesis, coincident with colour intensification and sexual receptivity, indicated by acceptance of copulations. As steroid levels peaked around the inferred ovulation time, maximal colour development occurred and sexual receptivity declined. When females were gravid and exhibited maximal mate rejection behaviours, progesterone levels remained consistently high, while testosterone exhibited a discrete second peak. At oviposition, significant declines in plasma steroid levels, fading of colouration and a dramatic decrease in male rejection behaviours co-occurred. Our results indicate a generally concordant association among steroid levels, colouration, behaviour and reproductive events. However, the prolonged elevation in progesterone and a second peak of testosterone was unrelated to reproductive state or further colour change, possibly suggesting selection on females to retain high steroid levels for inducing rejection behaviours.

Keywords

Female reproduction Sex steroids Female colouration Mate rejection Lizard 

Abbreviations

JND

Just noticeable difference

SE

Standard error

SD

Standard deviation

LWS

Long wavelength sensitive

GLMM

General linear mixed model

LSD

Least squared difference

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Department of Wildlife Conservation and ScienceZoos VictoriaParkvilleAustralia
  2. 2.Department of ZoologyUniversity of MelbourneMelbourneAustralia

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