摘要
本文组建了红基盘瓢虫和红星盘瓢虫的实验种群生命表，并应用Ｍｏｒｒｉｓ模式探讨影响种群数量变动的主要因子；计算了两瓢虫的内禀增长率（ｒ＿ｍ）及其它有关的生态学统计量。在实验室条件（平均温度２９．５±１．５℃和相对湿度７０．０±４．９％）下，红基盘瓢虫和红基盘瓢虫的内禀增长率（ｒ＿ｍ）、周限增长率（γ）均相近，而两者的种群趋势指数（Ｉ）、净繁殖率（Ｒ＿０）和世代平均历期（Ｔ）差异较大。红基盘瓢虫的内禀增长率ｒ＿ｍ＝０．０８４１，种群数量以每８．２天增长一倍的速率发展；红星盘瓢虫的内禀增长率ｒ＿ｍ＝０．０８８７，种群以每７．８天增长一倍的速率发展。生殖力减退是影响两瓢虫实验种群数量变动的主要因子。在盛夏进行两瓢虫的大量繁殖并应用于橄榄星室木虱的防治是可行的。
This paper deals with the life table of the experimental population of Lemniacircumusta and Phrynocaria congener under laboratory conditions(29.5±1.5℃and 70.0±4.9%RH)and analyzes the key factor affecting the population dynamies with Morris′smathematical model.The intrinsic rate of natural increase and other parameters related to itare calculated.The result shows that L. circumusta and P. congener are similar in theintrinsic rate of natural increase(r_m)and finite rate of increase(λ),but different inpopulation trend index(Ⅰ),net reproductive rate(R)and mean length of a generation(T).The key factor affecting the population dynamics of these two ladybirds is the abatement offecundity of the adults. The intrinsic rates of natural increase of L.circumusta and P. congener are 0.0841 and 0.0887, and their experimental population could increase by onefold in number in about 8. 2 and 7.8 days,respectively. So the massive rearing of these twoladybirds in summer for controlling Pseudophacopteron canarium in autumn is feasible.
出处
《华东昆虫学报》
1995年第1期39-46,共8页
Entomological Journal of East China
