蠼螋捕食草地贪夜蛾的行为及功能反应

Behavioral and Functional Responses of Labidura riparia Pallas Preying on Spodoptera frugiperda

为明确蠼螋对草地贪夜蛾的捕食作用,在温度(26±1)℃,相对湿度(75±5)%,光周期16L:8D的实验室条件下,观察了蠼螋5龄若虫对草地贪夜蛾卵、1~6龄幼虫和成虫的捕食行为和对6龄幼虫的捕食功能反应。结果表明:蠼螋5龄若虫对草地贪夜蛾卵和1~6龄幼虫均有捕食行为,对飞行能力弱的草地贪夜蛾成虫也具有捕食能力。蠼螋5龄若虫对草地贪夜蛾捕食过程中,并不取食完其整个虫体,而是咬食至猎物不动时,继续搜索捕食周围其他猎物。蠼螋5龄若虫对草地贪夜蛾6龄幼虫的捕食功能拟合HollingⅡ模型,日平均捕食量为2.85头,对入侵的草地贪夜蛾的为害具有一定的防控潜能。

Predation of Labidura riparia Pallas preying on Spodoptera frugiperda was investigated by observing the predatory behaviors of 5^(th) instar nymphs of L.riparia to the eggs and 1―6^(th) instar larvae and adults of S.frugiperda and measuring the predation functional response of 5^(th) instar nymphs of L.riparia to 6^(th) instar larvae S.frugiperda at the conditions of(26±1)℃,(75±5)%RH and a photoperiod of 16L:8D.The results demonstrated that the 5^(th) instar nymphs of L.riparia showed strong predation capacity to the eggs,larvae and even the flightless adults of S.frugiperda.When L.riparia preyed on S.frugiperda,L.riparia did not eat up S.frugiperda completely;instead,L.riparia bited S.frugiperda until the preys could not move and then transferred to attack other preys.The predatory functional response of the 5^(th) instar nymphs of L.riparia to 6^(th) instar larvae S.frugiperda fitted well with Holling II model,with average preying number of 2.85 per day.L.riparia can be used as a potential local natural enemy to control the invasive pest S.frugiperda in the future.