Cross Tolerance to Environmental Stressors: Effects of Hypoxic Acclimation on Cardiovascular Responses of Channel Catfish (Ictalurus punctatus) to a Thermal Challenge.
Cross Tolerance to Environmental Stressors: Effects of Hypoxic Acclimation on Cardiovascular Responses of Channel Catfish (Ictalurus punctatus) to a Thermal Challenge.
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DOI：
10.1016/j.jtherbio.2011.03.009
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发表时间：
2011-05
影响因子：
2.7
通讯作者：
Silva PE
中科院分区：
文献类型：
--
作者：
Burleson ML;Silva PE
缺氧和温度是影响鱼类心血管功能的两个主要的、相互作用的环境变量。本研究的目的是通过测量两组斑点叉尾鮰的心血管对温度升高的反应，确定适应缺氧是否会增加热耐受性。缺氧组在22℃的温度下适应中度缺氧（50%空气饱和度，PO2约75托）7天。含氧量正常（即对照组）组保持相同，但处于含氧量正常条件下（PO2 约为 150 托）。适应后，将鱼去大脑，安装背主动脉插管，然后暴露在升高的温度下，同时记录心血管变量。终点（临界热最大值，CTMax）定义为心率和血压急剧下降表明心血管衰竭的温度。适应中度缺氧的鱼的静息心率高于对照组。低氧环境下的鱼具有显着更高的 CTMax。适应缺氧会增加斑点叉尾鮰的心血管承受急剧温度升高的能力。
Hypoxia and temperature are two major, interactive environmental variables that affect cardiovascular function in fishes. The purpose of this study was to determine if acclimation to hypoxia increases thermal tolerance by measuring cardiovascular responses to increasing temperature in two groups of channel catfish. The hypoxic group was acclimatized to moderate hypoxia (50% air saturation, a PO2 of approximately 75 torr) at a temperature of 22° C for seven days. The normoxic (i.e. control) group was maintained the same, but under normoxic conditions (a PO2 of approximately 150 torr). After acclimation, fish were decerebrated, fitted with dorsal aorta cannulae, and then exposed to increasing temperature while cardiovascular variables were recorded. The end point (critical thermal maximum, CTMax) was defined as a temperature at which heart rate and blood pressure sharply decreased indicating cardiovascular collapse. Fish acclimatized to moderate hypoxia had higher resting heart rate than controls. Hypoxic acclimatized fish had a significantly higher CTMax. Acclimation to hypoxia increases the cardiovascular ability of channel catfish to withstand an acute temperature increase.
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