Rea J G, Irwin S W
Department of Biological and Biomedical Sciences, University of Ulster, Jordanstown, Newtownabbey, Ireland.
Parasitology. 1991 Dec;103 Pt 3:471-7. doi: 10.1017/s0031182000059990.
The cercariae of Cryptocotyle lingua have a brief but active life during which they do not feed. In order to maximize the probability of infection they must respond to a variety of host-related stimuli yet conserve their finite energy reserves by minimizing unnecessary muscular activity. In laboratory experiments, simulated shadows representing the passage of a fish host were found to increase population activity levels. Evidence was also found for a relationship between shadow duration and the duration of subsequent bursts of swimming activity. Adaptation to continuous shadowing was recorded, its onset and magnitude being dependent on both the frequency and duration of shadows delivered. As cercariae aged they became less responsive to shadow stimuli, especially those of short duration.
舌形隐孔吸虫的尾蚴具有短暂却活跃的生命周期，在此期间它们不进食。为了将感染概率最大化，它们必须对各种与宿主相关的刺激做出反应，同时通过尽量减少不必要的肌肉活动来保存有限的能量储备。在实验室实验中，发现模拟鱼类宿主经过的阴影会提高尾蚴群体的活动水平。还发现了阴影持续时间与随后游泳活动爆发持续时间之间的关系。记录到了对持续阴影的适应情况，其开始时间和程度取决于所施加阴影的频率和持续时间。随着尾蚴变老，它们对阴影刺激的反应变得不那么敏感，尤其是对持续时间短的阴影刺激。
