Ambient Temperature Regulates Drinking and Arterial Pressure in Eels(Endocrinology)
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概要
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Ambient temperature exerts strong influences on physiological processes in ectothermic animals. Thus, we have examined the effects of changes in water temperature on drinking and arterial blood pressure in seawater-adapted eels, Anguilla japonica. Temperature dependence was also examined with respect to the effects of atrial natriuretic peptide (ANP) on drinking and arterial pressure. When water temperature was altered abruptly from 18℃ to 11℃ or to 25℃, drinking rate consistently decreased or increased, respectively, in all fish examined. The temperature-response relationship was highly linear (p<0.001) between 11℃ and 25℃ with a Q_<10> value of 2.45. Arterial pressure was significantly lower at 11℃ compared with the level at 18℃, but no difference was observed between 18℃ and 25℃. The change in hematocrit did not parallel that of temperature. Plasma Na^+ concentration did not change at different temperatures. Bolus injections of eel ANP at 10, 100, and 1000 pmol/kg decreased drinking rate and arterial pressure dosedependently. The effects of ANP did not differ in terms of potency and efficacy at different temperatures except that the effects continued longer at lower temperatures. These results show that the ambient temperature causes profound effects on drinking rate in seawater eels even though Na^+ balance and blood volume were well maintained. The sensitivity to ANP, a physiological regulator of drinking in eels, was not altered by the temperature, suggesting an involvement of other factors in the thermogenic drinking that is demonstrated in this study.
- 社団法人日本動物学会の論文
- 2001-09-20
著者
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Tsukada Takehiro
Ocean Research Institute The University Of Tokyo
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Takei Yoshio
Ocean Research Institute The University Of Tokyo
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Tsukada T
Ocean Research Institute The University Of Tokyo
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