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Effects of water temperature changes on the endogenous and exogenous rhythms of oxygen consumption in glass eels Anguilla japonica

机译：水温变化对鳗e内耗氧和内耗氧节律的影响

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摘要

The oxygen consumption rate (OCR) of glass eels Anguilla japonica was measured to determine the effects of water temperature changes on their endogenous and exogenous rhythms. Glass eels were exposed to different water-temperature patterns during simulated 12, 14 and 24 h cycles. The OCR of wild glass eels, freshly collected from estuaries, exhibited a clear endogenous circatidal rhythm while kept in constant darkness at 15 +- 0.1℃. However, if the temperature was varied, the glass eels OCR coincided with the gradually increasing water temperature (Δt = 1℃ per 12 or 24 h) in the experimental chamber. This minor variation in water temperature (Δt = 1℃ per 12 or 24 h) was significant enough to affect the rhythmicity of the glass eels' OCR. When the glass eels were exposed to a cyclic increase or decrease in water temperature (1℃ per 14 h), the OCR peaks displayed a clear rhythmicity at 14 h intervals. The results indicate that the glass eels' OCR is controlled not only by an endogenous circatidal rhythm, but also by exogenous rhythms related to small environmental changes, such as water temperature changes of as little as 1℃. The possible mechanisms underlying these temperature responses are discussed and the implications of the findings for the eco-physiology and metabolic activity rhythms of glass eels are highlighted.
机译：测量了鳗鳗的耗氧率（OCR），以确定水温变化对其内生和外生节律的影响。在模拟的12、14和24小时周期中，玻璃鳗暴露于不同的水温模式。刚从河口采集的野生玻璃鳗的OCR表现出清晰的内生性昼夜节律，而在15±0.1℃的恒定黑暗中保持。但是，如果温度变化，则玻璃鳗OCR与实验室内逐渐升高的水温（每12或24小时Δt= 1℃）一致。水温的微小变化（每12或24小时Δt= 1℃）足以影响玻璃鳗OCR的节律性。当玻璃鳗暴露于水温周期性上升或下降（每14小时1℃）时，OCR峰每隔14小时显示出清晰的节奏。结果表明，玻璃鳗的OCR不仅受内生的昼夜节律控制，还受与环境变化有关的外在节律的控制，例如水温低至1℃。讨论了这些温度响应的潜在机制，并着重指出了这些发现对玻璃鳗的生态生理和代谢活动节律的影响。

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