Phenological Mechanisms of Calanus

哲水蚤物候机制

• 批准号: 8911520
• 负责人: Charles Miller
• 金额: $ 8万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-11-15 至 1991-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8911520&HistoricalAwards=false
• 关键词: Phenological; Mechanisms; Calanus

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).

Calanus属及其近亲是中纬度海洋中最丰富的浮游动物。 他们的生命周期的特征包括在最后一个发育阶段，第五个copepotite（C5）。 这些休眠时期在中间的大量深度度过。 喂养和发展进步都停止，而活动受到严格限制。人生历史上的休息阶段在动物中非常普遍，对于许多群体，例如昆虫，静止阶段的生物学细节是众所周知的。 在calanus中，情况并非如此。将开始对影响休眠和唤醒开始的因素进行的实验分析。休眠的C5将在秋天从缅因州附近的水域中收集到黑暗维护的容器中，并将暴露于三种处理中：1）持续的黑暗； 2）近表面强度和日长度；和3）500 m强度和日长度。结果应揭示触发唤醒的机制是内源性的（内部计时器）还是外源性（对光周期的响应）。