论文部分内容阅读
研究表明，异色瓢虫高龄若虫捕食麦二叉蚜的功能反应为ＨｏｌｌｉｎｇⅡ型反应，喜好捕食低龄若蚜；在４０℃下捕食率最低，１０℃次之，２５℃最高．在１０～２５℃内捕食率ｙ与温度ｘ的关系为ｙ＝２８．１３０３＋２．６６６５ｘ，在２５～４０℃内为ｙ＝１９９．９２７５－３．６４２ｘ；在种内干扰条件下，其捕食作用率Ｅ与开敌密度Ｐ的关系为Ｅ＝０．６８９７Ｐ－０．７９３０，搜索常数Ｑ为０．６８９７，干扰系数ｍ为０．７９３０；其分摊竞争强度Ｉ与异色瓢虫密度Ｐ的关系为Ｉ＝０．０４００＋１．０３８３ｌｏｇＰ．
The results showed that the functional response of C. heterophylla nymphs preyed on A. niloticus was Holling Ⅱ type reaction, preferring to prey on young aphids; preying at 40 ℃ was the lowest, followed by 10 ℃ and highest at 25 ℃. The predation rate y and temperature x in the range of 10 ~ 25 ℃ are y = 28.1303 + 2.6665x and y = 199.9275-3.642x at 25 ~ 40 ℃. The relationship between the rate E and the openness P was E = 0.6897P-0.7930, the search constant Q was 0.6897 and the interference coefficient m was 0.7930. The relationship between the competition intensity I and the density P I = 0.0400 + 1.0383logP.