OXYGEN-TRANSPORT DURING PROGRESSIVE HYPOXIA IN HIGH-ALTITUDE AND SEA-LEVEL WATERFOWL
OXYGEN-TRANSPORT DURING PROGRESSIVE HYPOXIA IN HIGH-ALTITUDE AND SEA-LEVEL WATERFOWL
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DOI：
10.1016/0034-5687(80)90046-8
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发表时间：
1980-01-01
期刊：
影响因子：
--
通讯作者：
TENNEY, SM
中科院分区：
文献类型：
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作者：
BLACK, CP;TENNEY, SM
在渐进性低氧条件下，比较了在青藏高原繁育、在海拔9200米处迁徙的斑头雁和体型相近、不会飞的海平面水禽北京鸭的氧气转运。北京鸭在海拔7620米时没有表现出对海拔的行为影响(例如，躁动)。斑头雁在海拔10668米时没有表现出明显的行为变化。呼吸和心脏对低氧的反应是动脉血氧分压的函数，符合典型的双曲线曲线，但斑头雁的反应开始于低20托。当自变量以动脉血氧含量表示时，两组的通气量和心输出量似乎遵循共同的反应曲线。与鸭相比，鹅具有较高的氧亲和力Hb，两者的氧解离曲线均因5640m的习服而略右移，但只有鸭因习服而出现红细胞增多症。在海平面条件下，鸭维持较高的混合静脉血氧分压，但在急性低氧暴露下，鹅的P.hivin.vO2较高。驯化后，鸭子的心输出量低于驯化前的状态，但鹅的心输出量高于迁徙的海拔。讨论了导致斑头雁中有利的O2运输进化的选择压力。
Under conditions of progressive hypoxia, O2 transport was compared in bar-headed geese (Anser indicus), a species which breeds on the Tibetan Plateau and migrates at altitudes up to 9200 m, and Pekin ducks (Anas platyrhynchos, f. domestica), a similarly sized, sea-level waterfowl that does not fly. Pekin ducks showed no altitude-induced behavioral effects (e.g., restlessness) up to 7620 m. Bar-headed geese tolerated 10,668 m with no observable behavioral changes. Ventilatory and cardiac responses to hypoxia as functions of Pa[arterial O2 partial pressure]O2 followed a typical hyperbolic contour, but the response began at almost 20 torr lower in the bar-headed goose. Ventilation and cardiac output appeared to follow a common response curve for the 2 spp., when the independent variable was expressed as arterial O2 content. The goose had a high O2 affinity Hb, compared with the duck; the oxyhemoglobin dissociation curves of both shifted slightly to the right as a result of acclimation to 5640 m; but only the duck developed erythrocytosis as a consequence of acclimation. Under sea level conditions the duck maintained a higher mixed venous PO2 [partial pressure O2], but with acute hypoxic exposures P.hivin.vO2 was higher in the goose. Following acclimation, cardiac output in the duck was lower than in the pre-acclimatized state, but in the goose it was higher up to the altitude at which it migrates. The selective pressures leading to the evolution of favorable O2 transport in the bar-headed goose are discussed.