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首页> 外文期刊>The Journal of Experimental Biology >Arterial blood gas levels and cardiovascular function during varying environmental conditions in a mudskipper, Periophthalmodon schlosseri
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Arterial blood gas levels and cardiovascular function during varying environmental conditions in a mudskipper, Periophthalmodon schlosseri

机译:涂泥船,Periophthalmodon schlosseri,在不同环境条件下的动脉血气水平和心血管功能

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摘要

Changes in blood gas levels, blood pressure and heart rate were studied in chronically cannulated mudskippers, Periophthalmodon schlosseri, subjected to air exposure (6h), aquatic hypoxia with access to air (water P sub(O[sub]2) 10.9 kPa, 6h) and forced submersion in normoxic water (12h) at 30 degree C. Air exposure did not affect either blood O sub(2) and had little effect on blood CO sub(2) levels, but blood pH increased slightly, but significantly. Blood ammonia concentration was elevated sixfold during air exposure. Aquatic hypoxia caused no significant changes in blood gas levels. When the fish was forcibly submerged, blood O sub(2) saturation decreased rapidly to approximately 30%. Blood P sub(CO[sub]2) and total CO sub(2) also decreased, but blood pH was unaffected by forcible submersion. Air exposure did not affect blood pressure or heart rate. Aquatic hypoxia did not affect blood pressure but transiently increased heart rate. In contrast, forced submersion significantly depressed heart rate throughout the period of submersion, while blood pressure decreased only transiently. Upon emersion, the heart rate immediately increased to above the control level when the fish took its first air breath.
机译:在长期暴露于空气中(6h),可接触空气的水生缺氧(水P sub(O [sub] 2)10.9 kPa,6h)的慢性插管式mud鱼(Periophthalmodon schlosseri)中研究了血气水平,血压和心率的变化)并在30°C下强迫浸没在高氧水中(12h)。空气暴露既不影响血液O sub(2),也不影响血液CO sub(2)水平,但血液pH值略有增加,但显着。空气暴露期间血氨浓度升高了六倍。水生低氧不会引起血气水平的明显变化。当鱼被强行淹没时,血液O sub(2)饱和度迅速下降至大约30%。血液P sub(CO 2)和总CO sub(2)也降低,但是血液pH不受强制浸没的影响。暴露于空气不会影响血压或心率。水生低氧不会影响血压,但会暂时增加心率。相反,在整个潜水期间,强迫潜水会严重降低心率,而血压只会暂时降低。出水时,鱼第一次呼吸时心率立即增加到控制水平以上。

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