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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effect of temperature and thermal stress on the hemodynamics of the scallop Chlamys farreri, as indicated by Doppler ultrasonography
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Effect of temperature and thermal stress on the hemodynamics of the scallop Chlamys farreri, as indicated by Doppler ultrasonography

机译：多普勒超声显示温度和热应激对扇贝衣原体血液动力学的影响

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摘要

The effect of temperature and thermal stress on cardiac activity and hemodynamics of a temperate scallop species Chlamys farreri was revealed using Doppler echocardiography. The variation scope of eight hemodynamic parameters within the optimal temperature range (8-26 degrees C) was determined, including heart beat rate (HR), acceleration of blood flow (ABF), peak systolic velocity (PS), end diastolic velocity (ED), maximum & minimum instantaneous blood flow (Max & Min-IBF), resistive index (RI) and PS/ED.The effects of two thermal stress factors were examined, prolonging high water temperature (28-30 degrees C) and fast heating (2 degrees C h(-1)), on hemodynamics of gill blood vessels. The HR-based Arrhenius break temperatures (ABTs) of the scallop under two stress factors were 29.32 degrees C and 32.37 degrees C respectively. Results showed that the scallop has a short-term tolerance to acute thermal stress compared with prolonging high temperature. When temperature rose above 28 degrees C, the PS/ED ratio and RI exceeded the thresholds of 3.0 and 0.63, respectively, indicating potential damage and malfunction of the blood vessels. Low water temperature (6 degrees C) may also have negative impacts on blood circulation. When faced with a rapidly rising temperature, the scallop cannot adjust its heartbeat in time, but in compensation, the scallop still supplied sufficient hemolymphs to the gill by expanding the diameter of the arteries. The cause of the scallop's death may be different under two thermal stresses: prolonging high temperature caused cardiac failure and physical damage of the artery, whereas rapid heating caused serious tachycardia accompanied by cardiac failure.
机译：使用多普勒超声心动图揭示了温度和热应激对温带扇贝物种衣原体衣原体心脏活动和血液动力学的影响。确定了在最佳温度范围（8-26摄氏度）内八个血液动力学参数的变化范围，包括心跳率（HR），血流加速度（ABF），收缩期峰值速度（PS），舒张末期速度（ED） ），最大和最小瞬时血流量（Max＆Min-IBF），电阻指数（RI）和PS / ED。检查了两个热应力因素的影响，延长了高温水温（28-30摄氏度）和快速加热（2摄氏度h（-1）），关于g血管的血液动力学。在两个应力因素下，扇贝的基于HR的Arrhenius断裂温度（ABTs）分别为29.32摄氏度和32.37摄氏度。结果表明，与延长高温相比，扇贝对急性热应激具有短期耐受性。当温度升至28摄氏度以上时，PS / ED比和RI分别超过3.0和0.63的阈值，表明潜在的损伤和血管功能异常。水温低（6摄氏度）也可能对血液循环产生负面影响。当面对迅速升高的温度时，扇贝无法及时调节其心跳，但是作为补偿，扇贝仍通过扩大动脉直径为ill提供了足够的血淋巴。在两个热应力下，扇贝死亡的原因可能有所不同：长时间的高温导致心力衰竭和动脉的物理损伤，而快速加热导致严重的心动过速并伴有心力衰竭。

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