کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2846080 | 1166409 | 2007 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Androgen dependent seasonal changes in muscle fiber type in the dewlap neuromuscular system of green anoles
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
فیزیولوژی
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چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physiology & Behavior - Volume 91, Issue 5, 15 August 2007, Pages 601-608
Journal: Physiology & Behavior - Volume 91, Issue 5, 15 August 2007, Pages 601-608
نویسندگان
Melissa M. Holmes, Casey L. Bartrem, Juli Wade,