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首页> 外文期刊>Marine biology >Diel vertical migration of the marine copepod Calanopia americana. II. Proximate role of exogenous light cues and endogenous rhythms
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Diel vertical migration of the marine copepod Calanopia americana. II. Proximate role of exogenous light cues and endogenous rhythms

机译：海洋co足类美洲鳄的Diel垂直迁移。二。内源性光信号和内源性节奏的直接作用

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The marine copepod Calanopia americana Dahl undergoes twilight diel vertical migration (DVM) in the Newport River estuary, North Carolina, USA, in synchrony with the light:dark cycle. Copepods ascend to the surface at sunset, descend to the bottom around midnight, and make a second ascent and descent before sunrise. Behavioral assays with C. americana in the laboratory during fall 2002/2003 and summer 2004 investigated aspects of three hypotheses for the proximate role of light in DVM: (1) preferendum hypothesis (absolute irradiance), (2) rate of change hypothesis (relative rates of irradiance change), and (3) endogenous rhythm hypothesis. Results suggest that C. americana responds to exogenous light cues consistent with its DVM pattern; changes in absolute irradiance evoked swimming responses that would result in an ascent at sunset and descent at sunrise, while relative rates of irradiance decrease at sunset (-0.0046 s(-1)) evoked an ascent response, and relative rates of irradiance increase at sunrise (0.0042 s(-1)) evoked a descent response. Furthermore, C. americana expressed an endogenous rhythm in vertical migration that was positively correlated with field observations of twilight DVM. Collectively, these results indicate that both exogenous light cues and endogenous rhythms play a proximate role in twilight DVM of C. americana, providing redundancy in the causes of its vertical migration.
机译：海洋co足类美洲蓝鳄在美国北卡罗来纳州的纽波特河河口经历了光暗狄尔垂直迁移（DVM），与“明暗循环”同步。 pe足类动物在日落时升至地表，在午夜左右下降至底部，并在日出之前进行第二次上升和下降。 2002/2003年秋季和2004年夏季在实验室中用美洲念珠菌进行的行为分析调查了光在DVM中的直接作用的三个假说的各个方面：（1）偏侧假说（绝对辐照度），（2）变化率假说（相对辐照度变化率），以及（3）内生节律假说。结果表明，美洲锥虫对与其DVM模式一致的外源光信号作出反应；绝对辐照度的变化引起游泳响应，从而导致日落时分上升，日出时下降；而相对辐照度的下降在日落时（-0.0046 s（-1））引起上升响应，相对辐照率的上升时日出（0.0042 s（-1））引起下降反应。此外，美洲念珠菌在垂直迁移中表达了一种内源性节律，与夜空DVM的现场观察呈正相关。总体而言，这些结果表明，外源光提示和内源节律在美洲锥虫的晚间DVM中均起着重要作用，从而为其垂直迁移的原因提供了冗余。

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