福寿螺产卵高度与克氏原螯虾捕食卵块的关系

为探讨利用克氏原螯虾作为生物防治福寿螺的一种途径，在实验室条件下研究螯虾对距水面不同高度的福寿螺卵块的捕食情况，并利用均匀设计和支持向量回归(UD-SVR)的方法对影响福寿螺产卵高度的因素进行分析。结果表明，福寿螺卵块距离水面的高度严重制约了螯虾的捕食效果，卵块距离水面越高螯虾对其捕食率越低；在福寿螺的大小、水面以上岸壁的高度、夜间温度、夜间湿度4个因素中，只有水面以上岸壁的高度这一因素对福寿螺产卵高度具有显著影响，随着距离的增大、福寿螺产卵高度上升，螯虾捕食卵块的难度也增加。因此在稻田及沟渠、池塘中，福寿螺产卵高峰期适当降低水位，产卵后抬高水位有利于螯虾对福寿螺卵块的捕食。

Study of the Procambius clarkii Prey Eggs of Pomacea canaliculata Lamarck.

In order to explore the using of Procambius clarkii as a way of biological control Pomacea canaliculata Lamarck.We studied Procambius clarkii prey on different height of eggs apart from water surface laid by P.canaliculata in laboratory,and we used a novel experimental design and analysis method named UD-SVR（uniform design and support vector regression） to study which factor affected the height of eggs laid by P.canaliculata.Result indicated height of eggs apart from water surface seriously restricted Procambius clarkii to prey the snail ＇ s eggs,and when the height apart from water surface was higher,the predation rate was lower.In the four factors,such as size of the snails,distance apart from the water surface,temperature at night,humidity at night,only the factor of distance apart from the water surface has significant effect on the spawning height of snails,this distance was proportional to the height of eggs laid by snail,as a result it made difficult for Procambius clarkii to prey eggs.Therefore,in paddy field,irrigation canals and pond,it would be best to reduce water level in peak period of spawning and raise water level after it spawning,this measures was beneficial for preying eggs by Procambius clarkii.