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Sexual selection predicts brain structure in dragon lizards

Hoops, D., Ullmann, J.F.P., Janke, A.L., Vidal-Garcia, M., Stait-Gardner, T., Dwihapsari, Y., Merkling, T., Price, W.S., Endler, J.A., Whiting, M.J. and Keogh, J.S. 2016, Sexual selection predicts brain structure in dragon lizards, Journal of evolutionary biology, In Press, pp. 1-13, doi: 10.1111/jeb.12984.

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Title Sexual selection predicts brain structure in dragon lizards
Author(s) Hoops, D.
Ullmann, J.F.P.
Janke, A.L.
Vidal-Garcia, M.
Stait-Gardner, T.
Dwihapsari, Y.
Merkling, T.
Price, W.S.
Endler, J.A.
Whiting, M.J.
Keogh, J.S.
Journal name Journal of evolutionary biology
Season In Press
Start page 1
End page 13
Total pages 13
Publisher Wiley-Blackwell
Place of publication Chichester, Eng.
Publication date 2016-10-21
ISSN 1420-9101
Keyword(s) agamid
lizard
magnetic resonance imaging
medial preoptic nucleus
neuroscience
reptile
sexual dichromatism
sexual dimorphism
ventromedial hypothalamic nucleus
visual modelling
Summary Phenotypic traits such as ornaments and armaments are generally shaped by sexual selection, which often favours larger and more elaborate males compared to females. But can sexual selection also influence the brain? Previous studies in vertebrates report contradictory results with no consistent pattern between variation in brain structure and the strength of sexual selection. We hypothesize that sexual selection will act in a consistent way on two vertebrate brain regions that directly regulate sexual behaviour: the medial preoptic nucleus (MPON) and the ventromedial hypothalamic nucleus (VMN). The MPON regulates male reproductive behaviour whereas the VMN regulates female reproductive behaviour and is also involved in male aggression. To test our hypothesis, we used high-resolution magnetic resonance imaging combined with traditional histology of brains in 14 dragon lizard species of the genus Ctenophorus that vary in the strength of precopulatory sexual selection. Males belonging to species that experience greater sexual selection had a larger MPON and a smaller VMN. Conversely, females did not show any patterns of variation in these brain regions. As the volumes of both these regions also correlated with brain volume (BV) in our models, we tested whether they show the same pattern of evolution in response to changes in BV and found that the do. Therefore, we show that the primary brain nuclei underlying reproductive behaviour in vertebrates can evolve in a mosaic fashion, differently between males and females, likely in response to sexual selection, and that these same regions are simultaneously evolving in concert in relation to overall brain size.
Language eng
DOI 10.1111/jeb.12984
Field of Research 060399 Evolutionary Biology not elsewhere classified
0603 Evolutionary Biology
0608 Zoology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, European Society for Evolutionary Biology
Persistent URL http://hdl.handle.net/10536/DRO/DU:30088478

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