干扰作用及空间异质性对七星瓢虫成虫捕食作用的影响

THE EFFECT OF MUTUAL INTERFERENCE AND SPACIAL HETEROGENITY ON PREDATION OF ADULT COCCINELLA SEPTEMPUNCTATA

通过系统研究，得出：１）七星瓢虫Ｃｏｃｉｎｅｌａｓｅｐｔｅｍｐｕｎｃｔａｔａ雌雄成虫在捕食过程中麦秆数越多，环境阻力越大，捕食作用率越低；２）七星瓢虫与异色瓢虫（Ｈａｒｍｏｎｉｓａｘｙｒｉｄｉｓ）捕食过程中的种间干扰作用大于两种瓢虫的种内干扰作用；３）异色瓢虫（♀）种内竞争强度Ｉ与瓢虫数Ｐ的关系为Ｉ＝０００１２＋１４０７２ｌｇＰ；异色瓢虫（♂）种内竞争强度Ｉ与Ｐ的关系为Ｉ＝０００５８＋１３９４２ｌｇＰ；七星瓢虫（♀）种内竞争强度Ｉ与Ｐ的关系为Ｉ＝－０００７２＋０７２３４ｌｇＰ。异色瓢虫（♀）和七星瓢虫（♀）的种间竞争强度Ｉ与天敌数量（Ｐ）关系的模型为Ｉ＝００５３９＋１１１６７ｌｇＰ，异色瓢虫（♀）和七星瓢虫（♂）的种间竞争强度Ｉ与Ｐ的模型为Ｉ＝０００１８＋１１９４４ｌｇＰ。

The effect of mutual interference and heterogeneity on Coccinella septempunctata was investigated. It was found that the more wheat stalks the adult ladybugs encountered, which meant more interference was met during predation, the lower the predation efficiency was observed.The interspecific mutual interference had more influence on predation of adult ladybug than the intraspecific mutual interference did in C. septempunctata and Harmonia axyricis . The correlation of intraspecific competition strength ( I ) and the number of ladybug ( P ) in H. axyricis could be described as I =0 0012+1 4072lg P for female, I =0 0058+1 3942 lg P for male and I =-0 0072+0 7234lg P for female C. septempunctata . The correlation of interspecific competition strength between C. septempunctata and H. axyricis (I ) and the number of natural enemies ( P ) could be described as I =0 0539+1 1167lg P for female C. septempunctata and female H. axyricis, I =0 0018+1 1944lg P for female H. axyricis and male C. septempunctata .