The response of Atlantic cod, Gadus morhua, to progressive hypoxia:: fish swimming speed and physiological stress
The response of Atlantic cod, Gadus morhua, to progressive hypoxia:: fish swimming speed and physiological stress
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DOI：
10.1007/s00227-005-0003-8
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发表时间：
2005-10-01
期刊：
影响因子：
2.4
通讯作者：
Steffensen, JF
中科院分区：
文献类型：
--
作者：
Herbert, NA;Steffensen, JF
大西洋鳕鱼Gadus morhua暴露在水氧分压逐渐下降的环境中(19.9；13.2；10.5；8.4；6.2和4.3kPaP(O2))。测量了鱼的游泳速度以及初级和次级应激指标(如血液皮质醇和乳酸)，以评估生理稳态(即应激)的严重变化是否先于行为的任何变化，或者反之亦然。当P(O2)从19.9kpa迅速降低到13.2kpa时，游泳速度增加了18%，这被解释为一种初始的回避反应。然而，游泳速度在中等稳定P(O2)水平(8.4kPa)时下降了21%，在渐进性深度低氧(4.3kPa)下继续下降41%。血浆皮质醇和血乳酸的升高表明主要的生理应激，但仅在4.3kPa时，这对应于该物种的临界氧分压。我们认为，低氧期间的速度下降有助于抵消主要压力，并适应鳕鱼在大片低氧地区的生存。
Atlantic cod, Gadus morhua, were exposed to a progressive stepwise decline in water oxygen pressure (19.9; 13.2; 10.5; 8.4; 6.2 and 4.3 kPa P(O2)). Fish swimming speed and indicators of primary and secondary stress (e.g. blood cortisol and lactate) were measured to assess whether a severe shift in physiological homeostasis (i.e. stress) preceded any change in behaviour or vice versa. Swimming speed increased by 18% when P(O2) was reduced rapidly from 19.9 kPa to 13.2 kPa and was interpreted as an initial avoidance response. However, swimming speed was reduced by 21% at a moderate level of steady P(O2) (8.4 kPa) and continued to drop by 41% under progressively deep hypoxia (4.3 kPa). Elevations in plasma cortisol and blood lactate indicated major physiological stress but only at 4.3 kPa, which corresponds to the critical oxygen tension of this species. We propose that the drop in speed during hypoxia aids to offset major stress and is adaptive for the survival of cod in extensive areas of low oxygen.