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Developmental sexual dimorphism and the evolution of mechanisms for adjustment of sex ratios in mammals
Citation
Cameron, EZ and Edwards, AM and Parsley, LM, Developmental sexual dimorphism and the evolution of mechanisms for adjustment of sex ratios in mammals, Annals of the New York Academy of Sciences, 1389 pp. 147-163. ISSN 0077-8923 (2016) [Refereed Article]
Copyright Statement
Copyright 2016 New York Academy of Sciences
Abstract
Sex allocation theory predicts biased offspring sex ratios in relation to local conditions if they would maximize parental lifetime reproductive return. In mammals, the extent of the birth sex bias is often unpredictable and inconsistent, leading some to question its evolutionary significance. For facultative adjustment of sex ratios to occur, males and females would need to be detectably different from an early developmental stage, but classic sexual dimorphism arises from hormonal influences after gonadal development. Recent advances in our understanding of early, pregonadal sexual dimorphism, however, indicate high levels of dimorphism in gene expression, caused by chromosomal rather than hormonal differences. Here, we discuss how such dimorphism would interact with and link previously hypothesized mechanisms for sex-ratio adjustment. These differences between males and females are sufficient for offspring sex both to be detectable to parents and to provide selectable cues for biasing sex ratios from the earliest stages. We suggest ways in which future research could use the advances in our understanding of sexually dimorphic developmental physiology to test the evolutionary significance of sex allocation in mammals. Such an approach would advance our understanding of sex allocation and could be applied to other taxa.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | sex allocation, chromosomal sexual dimorphism, sex-linked traits, X-inactivation, extended evolutionary synthesis |
| Research Division: | Biological Sciences |
| Research Group: | Zoology |
| Research Field: | Animal developmental and reproductive biology |
| Objective Division: | Environmental Management |
| Objective Group: | Management of Antarctic and Southern Ocean environments |
| Objective Field: | Biodiversity in Antarctic and Southern Ocean environments |
| UTAS Author: | Cameron, EZ (Professor Elissa Cameron) |
| UTAS Author: | Edwards, AM (Dr Amy Edwards) |
| UTAS Author: | Parsley, LM (Dr Laura Parsley) |
| ID Code: | 114825 |
| Year Published: | 2016 |
| Web of Science® Times Cited: | 7 |
| Deposited By: | Plant Science |
| Deposited On: | 2017-02-28 |
| Last Modified: | 2017-10-31 |
| Downloads: | 0 |
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