| 摘要: |
| 用罩笼方法测定了七星瓢虫成虫捕食棉蚜的功能反应。瓢虫一日捕蚜量(Na)用蚜虫日增长倍数(R)与初始蚜量之乘积减去剩余蚜量求得。瓢虫捕食蚜量的功能反应曲线符合 Holling—Ⅱ型,(a′=0.77;Th=0.00259)。测定了瓢虫干扰常数(m)和寻找常数(Q),(m=0.6284;Q=0.487)。根据功能反应曲线推论,当棉蚜与瓢虫共存于一个封闭系统内时,棉蚜的种群动态模型为N(t+1)=RN(t)exp((-0.77P)/(1+0.77×0.00259N(t))当 R 与 P 取定值时,N(t)对 N(t+1)的上升或下降起决定性作用。 |
| 关键词: 七星瓢虫,功能反应,棉蚜 |
| DOI： |
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| The Functional Response of Lady Bird Attacking on Aphids |
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Wang Shize Li Ping Plant Protection Department Northwestern Agricultural university
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| Abstract: |
| The functional response of lady bird (Coccinella septempunctata L.) to prey on cotton aphids (Aphis gosspii G.) was tested in cages.The number of aphids attacked (Na) was calculated as Na=R .where,Rn-n=aphid rate of population increase;n= total number of ahids bing counted on the 3rd day before predation;n= surviving after 24 hrs of predation on the 4th day.A functional response roughly fitting Holling--2 was obtained(a'=0.77;Th= 0.00259).Hassell's mutual interference equation was confirmed(Q=0.487;m=0.6284).It is reasoned that the population of aphids,together with lady birds within an enclosed system would be confirmed to an exponential increase or decrease. |
| Key words: Functional response,Coccinella semptempunctata,Aphis gossypii |
