Title
Effects of testosterone on morphology, performance and muscle mass in a lizard Effects of testosterone on morphology, performance and muscle mass in a lizard
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Bognor Regis ,
Subject
Biology
Source (journal)
Journal of experimental zoology: part A: comparative experimental biology. - Bognor Regis
Volume/pages
313(2010) :1 , p. 9-16
ISSN
1548-8969
ISI
000273497700002
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Because sexual selection pressures are high in sexually dimorphic organisms, morphological, physiological and performance traits are often studied in a sexual selection context. The proximate mechanisms underlying evolutionary change in these traits, however, remain largely unstudied. Here, we examined the role of steroids in shaping morphology and physiological performance in males of a sexually dimorphic lizard (Gallotia galloti). We compared morphology and physiological performance of males with experimentally elevated testosterone levels to sham-operated males. Before surgery, inter-individual variation in plasma testosterone levels correlated positively with bite force capacity. Administration of exogenous testosterone resulted in an increase of the mass of both jaw closing and locomotory muscles compared with sham-operated individuals, but the responsiveness varied considerably among muscle groups. In contrast to our expectations, the dramatic testosterone-induced changes in muscle masses did not result in concordant changes in bite force performance or sprint speed.
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