拟水狼蛛在水稻与茭白田之间的转移

A study on the dispersal of lycosid spider, Pirata subpiraticus between rice and Zizania fields

拟水狼蛛Piratasubpiraticus是稻田飞虱及其它害虫的主要捕食性天敌。研究表明 ,拟水狼蛛在水稻移栽后从茭白田大量迁入稻田 ,而水稻收割前后则转移回茭白田。元素标记试验显示其转移最大距离可达 4 0m以上。稻田附近的茭白田是拟水狼蛛的主要避难地之一。铷元素直接标记和释放可作为监测捕食性天敌在生境间转移的新方法。

The lycosid spider, Pirata subpiraticus , is one of the major predators of rice planthoppers and other rice pests. Pitfall trapping indicated that a large number of these spiders move into rice fields from adjacent Zizania habitat after the transplantation of rice seedlings, most moving back to Zizania fields before the rice is harvested. Rubidium (Rb) mark release tests indicated that the lycosid spiders could disperse up to 40 meters into rice field from a release site in a Zizania field, and suggest that Zizania fields are one of their refuges for overwintering. Direct marking of such predators with Rb is recommended as an effective tool for investigation of predator dispersal between habitats.