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首页> 外文期刊>The Journal of Experimental Biology >THE EFFECTS OF SEASONAL HYPERTROPHY AND ATROPHY ON FIBER MORPHOLOGY, METABOLIC SUBSTRATE CONCENTRATION AND SOUND CHARACTERISTICS OF THE WEAKFISH SONIC MUSCLE
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THE EFFECTS OF SEASONAL HYPERTROPHY AND ATROPHY ON FIBER MORPHOLOGY, METABOLIC SUBSTRATE CONCENTRATION AND SOUND CHARACTERISTICS OF THE WEAKFISH SONIC MUSCLE

机译：季节性肥大和萎缩对衰弱声肌肉的纤维形态，代谢底物浓度和声音特性的影响

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摘要

Male weakfish Cynoscion regalis possess highly specialized, bilateral, striated sonic muscles used in sound production associated with courtship, Androgen-driven hypertrophy of the muscles during the late spring spawning period results in a tripling of sonic muscle mass followed by post-spawning atrophy, This study examined the morphological and biochemical changes underlying seasonal changes in sonic muscle mass and the functional effects of these on contraction as measured by sound production, Sonic muscle fiber cross-sectional area (CSA) increased significantly during the period of hypertrophy and then decreased by nearly 60%, Both the CSA of the contractile cylinder and that of the peripheral sarcoplasm decreased significantly by late summer, with the peripheral ring of sarcoplasm virtually disappearing, Muscle protein content followed a similar trend, suggesting a major loss of structural elements during atrophy, Muscle glycogen and lipid content decreased precipitously in early June during the period of maximal sound production, Sound pressure level increased and sound pulse duration decreased with increasing sonic muscle mass, indicating that sonic muscle fibers contract with greater force and shorter duration during the spawning season, Neither the pulse repetition rate nor the number of pulses varied seasonally or with muscle mass, suggesting that the effects of steroids on the acoustic variables are more pronounced peripherally than in the central nervous system, Seasonal sonic muscle hypertrophy, therefore, functions as a secondary sexual characteristic that maximizes vocalization amplitude during the spawning period. [References: 53]
机译：雄性弱鱼犬夜蛾拥有高度专业的，双侧的横纹肌，用于与求偶相关的声音产生，在春季产卵期雄激素驱动的肌肉肥大会导致三倍的声音肌肉质量，继而产生产后萎缩。这项研究检查了声波肌肉质量的季节性变化背后的形态和生化变化，以及通过声音产生来测量的这些功能对收缩的功能影响，在肥大期间，声波肌肉纤维横截面积（CSA）显着增加，然后下降近60％，到夏末时，收缩圆柱的CSA和周围肌浆的CSA均显着下降，肌浆的外周环实际上消失了，肌肉蛋白质含量也遵循类似的趋势，表明在萎缩过程中，结构元素的主要损失是肌肉早期J糖原和脂质含量急剧下降在最大声音产生期间，声波水平随着声波肌肉质量的增加而增加，声压级降低，这表明声波纤维在产卵季节以更大的力收缩而持续时间更短，脉冲重复率和次数均不增加。脉搏随季节变化或随肌肉质量而变化，这表明类固醇对声学变量的影响比中枢神经系统在外周更明显，因此，季节性声波肌肉肥大可作为次生性特征，在产卵期间使发声幅度最大化。 [参考：53]

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