Western sand lance Ammodytes japonicus exhibits dormancy in summer known as estivation, a distinctive ecology among teleosts. Estivation starts in early summer and continues until winter even water temperature lowered than the initiation threshold. In this study, we examined the onset of estivation in western sand lance reared under two experimental conditions of 14–25 °C-shift or 12 °C-constant. Our observations revealed that estivation in this species can be induced by intrinsic circannual rhythms other than either high or fluctuating water temperatures.

中文翻译：

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西部沙矛玉蜀黍夏眠的开始不仅仅由水温升高引起

西部沙矛Ammodytes japonicus在夏季表现出休眠状态，称为夏眠，这是硬骨鱼中一种独特的生态。夏眠从初夏开始，一直持续到冬季，即使水温低于启动阈值。在这项研究中，我们研究了在 14-25°C 变化或 12°C 恒定两种实验条件下饲养的西部沙矛的夏眠开始情况。我们的观察表明，该物种的夏眠可以由内在的昼夜节律引起，而不是由水温高或波动引起。