稻田蜘蛛对弹尾虫的功能反应及选择作用

作者在室内研究了拟环纹豹蛛和草间小黑蛛对弹尾虫的功能反应和选择作用。结果表明，两种蜘蛛对弹尾虫的功能反应均为Ⅱ型反应，并存在极显著的差异，拟环纹豹蛛对弹尾虫的功能反应明显强于草间小黑蛛，其对弹尾虫的控制作用（ａ／Ｔｈ＝３９．７５８）是草间不黑蛛（１３．０３１）的３倍左右。弹尾虫和白背飞虱共存时，两种蜘蛛的功能反应变为Ⅲ型反应，并对弹尾虫都具有明显的偏好性，弹尾虫的存在降低了两种蜘蛛对白背飞虱的捕食

ON THE FUNCTIONAL RESPONSE AND PREFERENCE OF TWO PADDYFIELD SPIDERS TO A SPRINGTAIL

Indoor test was conducted on the functional response and preference of Par-dosa pseudoannulata (Boes. et Str. ) and Erigonidium graminicola (Sundvall), the two dominant spider predators in paddyfield, to a springtail Salina sp. . The results showed that both the functional responses of the two spiders belonged to Rolling's II Type, but there was significant difference between them, that of P. pseudoannulata was obviously stronger than that of E. graminicola, and the control effect of the former was three times as much as that of the latter . As the springtail and white backed rice planthopper Sogatclla furcifera (Horvath) coexisted in the cages, the functional responses of the two spiders changed into Holling's III Type, and both had evident preference to the springtail, i.e. the presence of springtail had decreased the predation of the two spiders on 5. furcifera. Consequently, we should not put undue emphasis on neutral insects' promotion of insect pests control, their function will be different in different growing stages of crops.