FUNCTIONAL ANATOMY OF FEEDING IN THE BLUEGILL SUNFISH, LEPOMIS MACROCHIRUS: IN VIVO MEASUREMENT OF BONE STRAIN
FUNCTIONAL ANATOMY OF FEEDING IN THE BLUEGILL SUNFISH, LEPOMIS MACROCHIRUS: IN VIVO MEASUREMENT OF BONE STRAIN
复制标题
蓝鳃太阳鱼 (Lepomis Macrochirus) 摄食的功能解剖学：骨应变的体内测量
DOI：
--
复制
发表时间：
1980
期刊：
影响因子：
--
通讯作者：
L. Lanyon
中科院分区：
文献类型：
--
作者：
G. Lauder;L. Lanyon
通过同时记录颅骨肌肉肌电图、鳃盖腔压力和鳃盖骨应变模式，研究了蓝鳃太阳鱼（Lepomis macro-chirus）的吸食机制。肌电曲线与其他高级硬骨鱼相似，包括预备、扩张和压缩阶段。在撞击过程中，胸带几乎保持不动。随着水从盖腔流出，盖腔压力显示峰值负值为145 cm H2O，随后出现高达50 cm H2O的正后压。特征性的“咳嗽”模式显示了初始的正相，随后是负相，然后是最终的正压脉冲。用玫瑰花形应变片和单元件应变片测量鳃盖骨应变。撞击过程中的峰值主压缩为1800 μ6，峰值应变率为−615×103μe/s，是之前记录的脊椎动物骨骼正常活动时的10倍以上。鳃盖骨劳损是由于鳃盖腔内压力迅速降低导致鳃盖向内侧变形而引起的，而不是肌肉活动引起的。观察到的应变模式是一致的弯曲和扭转力矩施加到鳃盖在喂养过程中的应力制度。假设内侧鳃盖表面上的两个突出的正交骨支柱抵抗这些弯曲和扭转力矩。
The suction feeding mechanism of the bluegill sunfish, Lepomis macro-chirus, was studied in unrestrained fishes by the simultaneous recording of cranial muscle electromyograms, opercular cavity pressures, and opercular bone strain patterns. The electromyographic profile was similar to that of other advanced teleosts and consisted of preparatory, expansive, and compressive phases. The pectoral girdle remained nearly stationary during the strike. Opercular cavity pressures showed peak negative values of 145 cm H2O followed by a positive afterpressure of up to 50 cm H2O as water flowed out of the opercular chamber. Characteristic ‘coughing’ patterns showed an initial positive phase, followed by a negative phase, and then a final positive pressure pulse. Bone strain on the operculum was measured with rosette and single element strain gauges. Peak principal compression during the strike was 1800 μ6 and the peak strain rate was −615×103μe/s, more than ten times that previously recorded in vertebrate bone during normal activity. Opercular bone strain results from the rapid reduction of pressure in the opercular cavity which causes the operculum to deform medially and does not result from muscle activity. The observed strain pattern is consistent with a stress regime of bending and twisting moments applied to the operculum during feeding. Two prominent orthogonal bony struts on the medial opercular surface are hypothesized to resist these bending and twisting moments.