多食性瓢虫捕食5种蚜虫的统计学比较:实验室研究(英文)

通过食蚜瓢虫Propylea dissecta(Mulsant)的捕食统计学参数的比较,尝试回答瓢虫是如何克服食物基础季节性的变动问题。在实验室中饲养五世代的瓢虫从五种蚜虫(Rhopalosiphum maidis(Fitch),Aphis craccivora Kock,Aphis gossypii Glover,Uroleucon compositae(Theobald)和Lipaphis erysimi(Kalt))为食物来源获得营养。相对适合的猎物次序是A.gossypii,A.craccivora,R.maidis,U.compositae和L.erysimi。新生幼虫的死亡率最高,其次是卵。统计表明,净生殖率、内懔增长率和有限增长率为(407.18,0.2274天-1,1.2553天-1)最高的在A.gossypii和最低的(176.02,0.1533天-1,1.1657天-1)在L.erysimi,一个世代时间最短的26.43天是捕食A.gossypii;而最长的33.73天为捕食L.erysimi。本研究为P.dissecta捕食A.gossypii高发生提供一种解释,因为它经历了高内懔增长率和统计参数最佳值。

COMPARATIVE DEMOGRAPHICS OF A GENERALIST PREDATORY LADYBIRD ON FIVE APHID PREY: A LABORATORY STUDY

Prey driven demographic parameters of an aphidophagous ladybird, Propylea dissecta (Mulsant) were studied in attempt to answer how ladybird overcomes the problem of seasonally fluctuating food base. The ladybird reared for five generations in laboratory derived differential nutrition from five food sources (i.e. aphid species, Rhopalosiphum maidis (Fitch), Aphis craccivora Koch, Aphis gossypii Glover, Uroleucon compositae (Theobald) and Lipaphis erysimi (Kalt.)). The order of relative prey suitability was A. gossypii, A. craccivora, R. maidis, U. compositae and L. erysimi. Neonates suffered maximum mortality followed by eggs. Estimates of net reproductive rate, intrinsic rate of increase and finite rate of increase were highest (407.18, 0.2274 day-1, 1.2553 day-1) on A. gossypii and lowest (176.02, 0.1533 day-1, 1.1657 day-1) on L. erysimi. Generation time was shortest (26.43 days) on A. gossypii and longest (33.73 days) on L. erysimi. The present study thus, provides an explanation to the high incidence of P. dissecta on A. gossypii, as it experienced high intrinsic rate of increase and optimal values for related demographic parameters.