Corticosterone Exposure during Embryonic Development Affects Offspring Growth and Sex Ratios in Opposing Directions in Two Lizard Species with Environmental Sex Determination
- 1 July 2009
- journal article
- research article
- Published by University of Chicago Press in Physiological and Biochemical Zoology
- Vol. 82 (4), 363-371
- https://doi.org/10.1086/588491
Abstract
Stress experienced by a reproducing female can substantially affect the morphology, behavior, and physiology (and hence fitness) of her offspring. In addition, recent studies demonstrate that stress hormones (corticosterone) influence sex determination of embryos. To explore these issues, we manipulated corticosterone levels in eggs of two Australian lizard species (Amphibolurus muricatus and Bassiana duperreyi) that exhibit temperature‐dependent sex determination (TSD). Elevated corticosterone levels during embryonic development affected body size, growth rates, and sex ratios of the resultant offspring, but the direction and magnitude of these effects differed between the species. Corticosterone enhanced growth rates of hatchling B. duperreyi but inhibited growth of A. muricatus. Eggs with elevated levels of corticosterone produced more daughters in A. muricatus and more sons in B. duperreyi. The sex‐ratio effect in A. muricatus may have been due to sex‐specific embryonic mortality, but it may represent a direct effect on sex determination in B. duperreyi (because embryonic mortality was not affected by corticosterone manipulation in this species). These results demonstrate the complexity of proximate mechanisms for sex determination among reptiles with TSD and illustrate the potential role of corticosterone in sex‐determining systems.This publication has 59 references indexed in Scilit:
- Genetic evidence for co-occurrence of chromosomal and thermal sex-determining systems in a lizardBiology Letters, 2007
- Fitness of juvenile lizards depends on seasonal timing of hatching, not offspring body sizeOecologia, 2007
- Maternal nutrition affects reproductive output and sex allocation in a lizard with environmental sex determinationProceedings. Biological sciences, 2007
- Maternal developmental stress reduces reproductive success of female offspring in zebra finchesProceedings. Biological sciences, 2006
- Experimental evidence that corticosterone affects offspring sex ratios in quailProceedings. Biological sciences, 2006
- Stress Hormones: A Link between Maternal Condition and Sex‐Biased Reproductive InvestmentThe American Naturalist, 2005
- Offspring sex ratio is related to paternal train elaboration and yolk corticosterone in peafowlBiology Letters, 2005
- Corticosterone levels predict survival probabilities of Galápagos marine iguanas during El Niño eventsProceedings of the National Academy of Sciences of the United States of America, 2001
- Experimental test of the effect of maternal hormones on larval quality of a coral reef fishOecologia, 1999
- Sex-specific effects of prenatal stress on hypothalamic-pituitary-adrenal responses to stress and brain glucocorticoid receptor density in adult ratsDevelopmental Brain Research, 1995