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首页> 外文期刊>The Journal of Experimental Biology >Does feeding limit cardiovascular modulation in the Dungeness crab Cancer magister during hypoxia?
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Does feeding limit cardiovascular modulation in the Dungeness crab Cancer magister during hypoxia?

机译：缺氧期间进食是否会限制太平洋大蟹蟹魔导师的心血管调节？

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Decapod crustaceans inhabit aquatic environments that are frequently subjected to changes in oxygen content. The physiological mechanisms that allow them to cope with periodic episodes of hypoxia have been well documented. Most crustaceans exhibit a bradycardia coupled with diversion of haemolymph from digestive organs towards ventral structures. However, all these experiments were conducted on animals that were starved prior to experimentation in order to avoid increases in metabolism associated with digestive processes. The present study sought to determine how the Dungeness crab Cancer magister balances the demands of physiological systems when they feed and digest in hypoxia. Cardiac parameters and haemolymph flow rates through each arterial system exiting the heart were measured using a pulsed-Doppler flowmeter. Scaphognathite beat frequency (ventilation rate) was calculated by recording changes in pressure in the branchial chamber. There was an increase in both cardiac and ventilatory parameters following feeding. Digestive processes were facilitated by an increase in haemolymph flow rates through the anterior aorta, hepatic arteries and sternal artery. Cancer magister showed a typical bradycardia during hypoxia (3.2 kPa). However, food intake caused a significant reduction in this response. Likewise, ventilation rate also showed effects of addivity, increasing in response to both food intake and hypoxia. Digestion during hypoxia was associated with a decrease in both stroke volume and cardiac output. Blood was diverted away from digestive structures, suggesting that blood flow events are prioritized during hypoxia. The changes in haemolymph flow rates paralleled those in previous reports on reductions in protein synthesis in the hepatopancreas during hypoxia. Haemolymph flow rates through the anterior aorta did not change; thus the blood supply to the supraoesophageal ganglion was maintained during feeding in hypoxia. The results show that the nutritional state of an animal is important in modulating its physiological responses to environmental perturbations. This underscores the importance of an integrative approach, studying physiological responses at the organismal level.
机译：十足纲甲壳类动物生活在水环境中，氧含量经常发生变化。生理机制已使他们能够应对周期性的缺氧发作。大多数甲壳类动物表现出心动过缓，并伴有血淋巴从消化器官转移到腹侧结构。但是，所有这些实验都是在实验前饿死的动物上进行的，以避免与消化过程相关的代谢增加。本研究试图确定太平洋大蟹蟹大魔王在缺氧条件下进食和消化时如何平衡生理系统的需求。使用脉冲多普勒流量计测量通过每个离开心脏的动脉系统的心脏参数和血淋巴流速。通过记录小房中压力的变化，计算出白铁矿的搏动频率（通气率）。进食后心脏和通气参数均增加。通过前主动脉，肝动脉和胸骨动脉的血淋巴流速的增加促进了消化过程。癌症大亨在缺氧（3.2 kPa）期间表现出典型的心动过缓。但是，食物摄入量导致这种反应明显减少。同样，通气率也显示出相加作用，响应于食物摄入和缺氧而增加。缺氧时的消化与中风量和心输出量的减少有关。血液从消化系统转移开来，表明在缺氧期间血流事件优先。血淋巴流速的变化与先前报道的低氧时肝胰脏蛋白质合成减少的报道相似。通过前主动脉的血淋巴流量没有变化;因此在低氧喂养期间维持了食管上神经节的血液供应。结果表明，动物的营养状态对于调节其对环境扰动的生理反应很重要。这强调了综合方法的重要性，该方法应在生物体水平上研究生理反应。

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