Androgen dependent seasonal changes in muscle fiber type in the dewlap neuromuscular system of green anoles.
Androgen dependent seasonal changes in muscle fiber type in the dewlap neuromuscular system of green anoles.
复制标题
绿变色蜥的赘肉神经肌肉系统中肌肉纤维类型的雄激素依赖性季节性变化。
DOI：
10.1016/j.physbeh.2007.03.022
复制
发表时间：
2007
影响因子：
2.9
通讯作者：
Wade,Juli
中科院分区：
文献类型：
--
作者：
Holmes,MelissaM;Bartrem,CaseyL;Wade,Juli
Green anoles (Anolis carolinensis) possess two sexually dimorphic neuromuscular systems involved in reproductive behaviors. One controls extension of a red throat fan (dewlap), which males employ during courtship, and the other controls intromission of copulatory organs (hemipenes). Although seasonal changes in circulating androgens mediate both courtship and copulatory behaviors, testosterone has differential effects on the underlying neuromuscular morphology. The present experiments were designed to test whether changes in muscle fiber type correspond to seasonal and androgenic regulation of reproductive behaviors in gonadally intact males (Experiment 1) or castrated males treated with either testosterone propionate or vehicle (Experiment 2). Gonadally intact males housed in breeding environmental conditions had a higher percentage of fast oxidative glycolytic fibers in the dewlap muscle than non-breeding males, but no effect of season on copulatory fibers was detected. Interestingly, testosterone treatment increased the percentage of fast oxidative glycolytic dewlap fibers independent of season, suggesting that routine changes in this hormone may mediate fiber type in gonadally intact males. In contrast, testosterone manipulation had little to no effect on copulatory muscle fiber type, demonstrating that a change in this feature is not the primary mediator for seasonal changes in male copulatory behaviors.
