全沟硬蜱围食膜初步观察研究

本工作用光镜和电镜技术对全沟硬蜱的围食膜进行了初步观察研究。结果表明，饥饿幼虫、若虫、成虫以及吸血期雄性成虫不具围食膜。吸血期幼虫、若虫及雌性成虫最晚分别于吸血开始后20、20及18小时出现了单层结构的围食膜；缓慢吸血期围食膜的厚度持续增加，而在快速吸血期其厚度却会显著减小。饱血后发育期围食膜不断增厚，愈来愈拱曲，与肠壁的距离不断扩大，并形成多层结构；至少分别于饱血后12、25及11天，仍能在幼虫、若虫及雌性成虫肠腔观察到完好状态的围食膜。全沟硬蜱是我国北方地区多种血液传播病原体的重要媒介，其围食膜的发现及围食膜形态变化的初步描述，对进一步认识这些病原体在全沟硬蜱体内迁移扩散规律、发育动态以及向宿主的传播途径，可提供有益的启示。

PRELIMINARY OBSERVATIONS ON THE PERITROPHIC MEMBRANE OF THE TICK IXODES PERSULCATUS

A preliminary light and electron microscopic study was conducted to observe the peri trophic membrane (PM) and its morphological changes in the tick Ixodes persulcatus . The results show that no PM occurs in blood feeding adult males and starved larvae, nymphs and adult males and females. During blood feeding a single layered PM occurs no later than 20,18, and 18 hours in the gut lumen of larvae, nymphs and adult females respectively. The thickness of the PM gradually increases during slow feeding phase, whereas there is a rapid decrease in PM thickness during rapid feeding phase. In engorged ticks, the PM becomes increasingly thicker and thicker, more and more winding, and simultaneously takes a multi layered appearance. At the same time, its distance to the gut wall surface increases rapidly. An intact PM can still be found at days 12, 25 and 11 after repletion in larvae, nymphs and adult females respectively. Our results can provide some insights for the further understanding of the behavior and systemic invasion of blood pathogens in their vector ticks.