Effect of Thermal Acclimation on Muscle Fiber Recruitment of Swimming Striped Bass (Morone saxatilis)
Effect of Thermal Acclimation on Muscle Fiber Recruitment of Swimming Striped Bass (Morone saxatilis)
复制标题
热驯化对游泳条纹鲈 (Morone saxatilis) 肌纤维募集的影响
DOI：
10.1086/physzool.60.3.30162284
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
B. Sidell
中科院分区：
文献类型：
--
作者：
J. Sisson;B. Sidell
采用肌电描记法测定了热驯化条纹鲈红、白色肌纤维的募集方式和白色肌激活的初始游泳速度。将驯化至9 ℃和25 ℃的鱼分别在其各自的驯化温度和15 ℃的共同温度下诱导在耐力隧道中游泳。在9 ℃和25 ℃的适应温度下游泳的动物的初始白色肌肉补充速度（最大可持续游泳速度）分别为1.95 ± 0.33和2.82 ± 0.26 BL s（体长s）。持续的游泳速度对急性温度变化的热敏感性与鱼的热历史无关，表明适应9和25 ℃的动物的Q10分别为1.47和1.53。冷驯化条纹鲈鱼明显导致持续游泳能力的增加。当在15 ℃下测试时，适应9 ℃的鱼能够仅使用红色肌肉获得2.46 ± 0.13 BL s的速度，而适应25 ℃的鱼开始在1.84 ± 0.10 BL s时招募白色纤维。这种效应似乎完全归因于冷驯化后红色纤维占据的躯干肌肉组织的比例增加。条纹鲈的尾拍频率（TBF）和游泳速度之间的关系是独立的动物的热历史，但依赖于游泳试验的水温。描述这种关系的线的斜率减小（即，步幅增加），这意味着在低温下动力传输到推进器的效率增加或运动的能量成本降低。
Recruitment pattern of red and white muscle fibers and initial swimming speeds of white muscle activation by thermally acclimated striped bass (Morone saxatilis) were determined by electromyography. Fish acclimated to 9 and 25 C were induced to swim in a stamina tunnel both at their respective acclimation temperatures and at a common temperature of 15 C. Speeds of initial white muscle recruitment (maximal sustainable swimming speed) are 1.95 ± 0.33 and 2.82 ± 0.26 BL s⁻¹ (body lengths s⁻¹) for animals swimming at their acclimation temperatures of 9 and 25 C, respectively. Thermal sensitivity of sustained swimming speed to acute temperature change is independent of the fish's thermal history, showing Q10's of 1.47 and 1.53 for animals acclimated to 9 and 25 C, respectively. Cold acclimation of striped bass clearly leads to an increase in sustained swimming ability. When tested at 15 C, fish acclimated to 9 C are able to attain a speed of 2.46 ± 0.13 BL s⁻¹ using exclusively red muscle, while those acclimated to 25 C begin to recruit white fibers at 1.84 ± 0.10 BL s⁻¹. This effect appears solely attributable to the increased proportion of trunk musculature occupied by red fibers after cold acclimation. The relationship between tail-beat frequency (TBF) and swimming speed for striped bass is independent of the animal's thermal history but dependent on water temperature of the swimming trial. Slopes of the lines describing this relationship decrease (i.e., stride length increases) with decreasing water temperature, implying either increased efficiency of power transmission into propulsion or decreased energetic cost of locomotion at cold temperatures.