Multifactorial Sex Determination in Chameleons

Cissy J. Ballen, Richard Shine, Robin M. Andrews, Mats Olsson

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Classifying a species as having either genotypic or environmental sex determination may oversimplify the processes that influence offspring sex. Using two independently gathered data sets on veiled chameleons (Chamaeleo calyptratus), we show that a hatchling's sex is affected by the interaction between egg mass and incubation temperature. In both studies, larger eggs produced daughters at lower temperatures and sons at higher temperatures; however, the relationships between incubation temperature, egg mass, and sex diverged markedly between the two studies. The shift in egg-size effects was seen between 25°C and 28°C in one study and between 28°C and 30°C in the other. The links between offspring size, sex, and incubation temperature are not an artifact of differential mortality; in one of the studies, egg survival rates were uniformly high. Other data on scincid and agamid lizards also do not support a simple dichotomy in sex-determining systems. Our results challenge simplistic classificatory schemes and call for a reanalysis of existing data sets to look for multifactorial as well as unifactorial effects on offspring sex.

Original languageEnglish (US)
Pages (from-to)548-551
Number of pages4
JournalJournal of Herpetology
Volume50
Issue number4
DOIs
StatePublished - Dec 1 2016

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Chamaeleonidae
sex determination
egg
gender
incubation
temperature
size effect
egg size
egg masses
lizard
artifact
egg incubation
mortality
lizards
survival rate

Cite this

Ballen, C. J., Shine, R., Andrews, R. M., & Olsson, M. (2016). Multifactorial Sex Determination in Chameleons. Journal of Herpetology, 50(4), 548-551. https://doi.org/10.1670/15-003

Multifactorial Sex Determination in Chameleons. / Ballen, Cissy J.; Shine, Richard; Andrews, Robin M.; Olsson, Mats.

In: Journal of Herpetology, Vol. 50, No. 4, 01.12.2016, p. 548-551.

Research output: Contribution to journalArticle

Ballen, CJ, Shine, R, Andrews, RM & Olsson, M 2016, 'Multifactorial Sex Determination in Chameleons' Journal of Herpetology, vol. 50, no. 4, pp. 548-551. https://doi.org/10.1670/15-003
Ballen CJ, Shine R, Andrews RM, Olsson M. Multifactorial Sex Determination in Chameleons. Journal of Herpetology. 2016 Dec 1;50(4):548-551. https://doi.org/10.1670/15-003
Ballen, Cissy J. ; Shine, Richard ; Andrews, Robin M. ; Olsson, Mats. / Multifactorial Sex Determination in Chameleons. In: Journal of Herpetology. 2016 ; Vol. 50, No. 4. pp. 548-551.
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