Phenological Mechanisms of Calanus

哲水蚤属的桡足类及其近亲是 中纬度海洋中数量最多的动物园。 他们的生活 周期的特征包括延长的静息期， 最后一个发育阶段，第五桡足类（C5）。 这些 休眠期在中层水的相当深的地方度过。 进食和发育进程都停止了，而活动则停止了。 非常有限。生命史中的休息阶段 在动物中很常见，对于许多群体来说，比如昆虫， 休眠期的生物学细节 知道的 在哲水蚤中，情况并非如此。实验 分析了影响休眠开始的因素， 就会被唤醒将在以下时间收集Dorpal C5： 秋天从缅因州的沃茨里运来的深色容器， 并将接受三种治疗：1）持续黑暗; 2)近地面强度和日长; 3）500米强度 和白昼长度。结果应该揭示， 触发唤醒是内源性的（内部计时器）或外源性的 （对光周期的反应）。

Copepods of the genus Calanus and its near relatives are the most abundant zooplankters in mid-latitude oceans. Their life cycles characteristically include prolonged resting phases in the last developmental stage, the fifth copepodite (C5). These dormant periods are spent at considerable depths in mid-water. Feeding and developmental progress both stop, while activity is sharply limited. Rest phases in the life history are very common among animals, and for many groups, such as the insects, the biological details of the resting phases are very well known. In Calanus this is not the case. An experimental analyses of the factors influencing the onset of dormancy and arousal will be initiated. Dormant C5 will be collected in dark-maintaining containers from waters off Maine in autumn, and will be exposed to three treatments: 1) constant darkness; 2) near-surface intensity and daylength; and 3) 500 m intensity and daylength. Results should reveal whether the mechanism that triggers arousal is endogenous (an internal timer) or exogenous (a response to photoperiod).