The effects of acute temperature change on swimming performance in bluegill sunfish Lepomis macrochirus
The effects of acute temperature change on swimming performance in bluegill sunfish Lepomis macrochirus
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DOI：
10.1242/jeb.014688
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发表时间：
2008-05-01
影响因子：
2.8
通讯作者：
Ellerby, David J.
中科院分区：
文献类型：
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作者：
Jones, Emily A.;Jong, Arianne S.;Ellerby, David J.
许多鱼改变步态在其有氧支持范围内的游泳速度。急性温度变化对这种类型的运动行为的影响知之甚少。蓝鳃太阳鱼在低速时以唇形模式游泳，随着游泳速度的增加，它们会切换到波动模式游泳。在14、18、22、26和30 ℃下测定了驯化至22 ℃的蓝鳃鱼的最大有氧游泳速度（U-max）、唇形-波动步态转换速度（U-transs）以及鳍拍频率与速度的关系。在温度低于驯化温度（T-a），U-max，U-transs和尾鳍和胸鳍拍频在这些速度相对于驯化水平降低。在高于T-a的温度下，这些变量相对于驯化水平没有变化。在30摄氏度时补充氧气对游泳成绩没有影响。在与游泳实验相同的温度下，在体外测量了胸鳍外展肌浅展肌的机械功率输出。在和低于T-a，最大功率输出产生在一个周期频率近似匹配在体内胸鳍拍频。在温度高于T-a时，肌肉功率输出和周期频率可以增加到高于U-trans. Our数据表明触发唇状-波动步态转变的因素随温度而变化。肌肉的机械性能限制唇状体的游泳速度在T-a及以下，但其他机械或能量因素限制唇状体的游泳速度在温度以上T-a。
Many fish change gait within their aerobically supported range of swimming speeds. The effects of acute temperature change on this type of locomotor behavior are poorly understood. Bluegill sunfish swim in the labriform mode at low speeds and switch to undulatory swimming as their swimming speed increases. Maximum aerobic swimming speed ( U-max), labriform-undulatory gait transition speed ( U-trans) and the relationships between fin beat frequency and speed were measured at 14, 18, 22, 26 and 30 C in bluegill acclimated to 22 degrees C. At temperatures below the acclimation temperature ( T-a), U-max, U-trans and the caudal and pectoral fin beat frequencies at these speeds were reduced relative to the acclimation level. At temperatures above T-a there was no change in these variables relative to the acclimation level. Supplementation of oxygen levels at 30 degrees C had no effect on swimming performance. The mechanical power output of the abductor superficialis, a pectoral fin abductor muscle, was measured in vitro at the same temperatures used for the swimming experiments. At and below T-a, maximal power output was produced at a cycle frequency approximately matching the in vivo pectoral fin beat frequency. At temperatures above T-a muscle power output and cycle frequency could be increased above the in vivo levels at U-trans. Our data suggest that the factors triggering the labriform-undulatory gait transition change with temperature. Muscle mechanical performance limited labriform swimming speed at T-a and below, but other mechanical or energetic factors limited labriform swimming speed at temperatures above T-a.