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首页> 外文期刊>Fish Physiology and Biochemistry >Circadian heart rate changes and light-dependence in the Mediterranean seabream Sparus aurata
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Circadian heart rate changes and light-dependence in the Mediterranean seabream Sparus aurata

机译：地中海鲷Sparus aurata中昼夜节律的变化和光依赖性

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摘要

Despite the abundant literature on circadian heart rate rhythms in fish, few studies have attempted to elucidate if such pattern is endogenous or if it is modulated by environmental cues. In this study, heart rates were continuously recorded in Sparus aurata acclimated to different light regimes (normal or shifted LD 12:12 cycle and a pulsed 0.75:0.75 LD cycle) to investigate the endogenous nature and the role of light on the circadian pattern of heart rate. Under LD 12:12, the daily pattern of heart rate showed higher values at night and lower rates during the day (average amplitude of the heart rate change of 10.6 +- 5.7 beats min~(-l)). The circadian pattern was maintained in animals under constant light but the amplitude was decreased (2.4 +- 1.1 beats min~(-l)). Light masks the expression of the rhythm because under a pulsed LD cycle, heart rate tracks the pulsed LD phases, increasing during the dark phase and decreasing during the light phase. Besides the ultradian pattern imposed, an underlying circadian rhythm was detected, which indicates that the rhythm is endogenous. However, the strong link between heart rate and light obtained under pulsed LD cycles suggest the timing mechanism to be mostly based on external light reception.
机译：尽管有大量关于鱼类昼夜节律的文献，但很少有研究试图阐明这种模式是内源的还是受环境提示调节的。在这项研究中，连续记录了适应不同光照方式（正常或偏移的LD 12:12周期和脉冲的0.75：0.75 LD周期）的Sparus aurata的心率，以研究光的内源性及其对昼夜节律的影响。心率。在LD 12:12下，心率的每日模式在晚上显示较高的值，而在白天则显示较低的值（心率变化的平均幅度为10.6±5.7节拍min〜（-1））。动物在恒定光照下维持昼夜节律模式，但振幅降低（2.4±1.1节拍min〜（-1））。光线掩盖了节奏的表达，因为在脉冲的LD周期下，心率会跟踪脉冲的LD相位，在黑暗阶段增加，而在明亮阶段减少。除了施加的超音速模式外，还检测到潜在的昼夜节律，这表明该节奏是内生的。但是，心率与脉冲LD周期下获得的光之间的紧密联系表明，计时机制主要基于外部光接收。

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