Little if any role of male gonadal androgens in ontogeny of sexual dimorphism in body size and cranial casque in chameleons.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
14 02 2020
14 02 2020
Historique:
received:
11
10
2019
accepted:
30
01
2020
entrez:
16
2
2020
pubmed:
16
2
2020
medline:
18
11
2020
Statut:
epublish
Résumé
Proximate control of the development of sexual dimorphism is still hotly debated in reptiles. In some squamates, many male-typical exaggerated traits including body size were assumed to be controlled by masculinization by male gonadal androgens. We performed a manipulative experiment to test the importance of this mechanism in the development of pronounced sexual differences in body size and size of head casque in the chameleon Chamaeleo calyptratus. Castrated males attained male-typical body size highly deviating from the body size of control females. Ontogenetic allometries of casque size on head length revealed that sexes depart considerably in casque growth later in the ontogeny; however, castrated males still follow male-typical casque growth. Paradoxically, exogenous testosterone led in females to slight increase of casque size, which might reflect interference with the feminizing effects of female gonadal hormones. The results in males strongly suggest that masculinization by male gonadal androgens during growth is not required for the development of sexual dimorphism in body size and casque size in the chameleon. The ontogeny of sexually dimorphic body size and exaggerated traits in at least some squamates is likely controlled by other proximate mechanism, possibly by feminization by ovarian hormones.
Identifiants
pubmed: 32060387
doi: 10.1038/s41598-020-59501-6
pii: 10.1038/s41598-020-59501-6
pmc: PMC7021717
doi:
Substances chimiques
Androgens
0
Testosterone
3XMK78S47O
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
2673Références
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