Rea J G, Irwin S W
Department of Biological and Biomedical Sciences, University of Ulster, Jordanstown, Co. Antrim, N. Ireland.
Parasitology. 1992 Aug;105 ( Pt 1):131-7. doi: 10.1017/s0031182000073789.
Laboratory experiments indicated that the active life-span of the cercariae of Cryptocotyle lingua was temperature-dependent. An increase in water temperature and population age both correlated with a tendency for the organisms to become decaudate. The larvae were strongly photoresponsive to lateral light but with time, horizontal swimming rates (HSRs) from release point to light source progressively declined. When measured over a range of light quantities, HSRs peaked at 30 microM/m2/s. HSRs were also influenced by water temperature. A rapid increase occurred up to 15 degrees C after which there was a precipitous decline. HSRs to coloured light were negatively correlated with increasing wavelength. When offered a choice between colours, cercariae favoured the shorter wavelengths. The implications of these responses for successful transmission are discussed.
实验室实验表明，舌形隐孔吸虫尾蚴的活跃寿命取决于温度。水温升高和种群年龄增加均与生物体出现脱尾趋势相关。幼虫对侧光有强烈的光反应，但随着时间推移，从释放点到光源的水平游泳速度（HSRs）逐渐下降。在一系列光量条件下测量时，HSRs在30微摩尔/平方米/秒时达到峰值。HSRs也受水温影响。在15摄氏度之前会迅速上升，之后则急剧下降。对有色光的HSRs与波长增加呈负相关。当在颜色之间进行选择时，尾蚴更喜欢较短的波长。文中讨论了这些反应对成功传播的影响。
