主要农林粉虱性比变化影响因素剖析

Analysis of Factors Affecting Sex Ratio of Major Species of Whiteflies in Agriculture and Forestry

粉虱属于单倍体—二倍体繁殖模式生物,其种群性比常呈现出偏雌性和季节波动性。对主要农林粉虱性比变化的影响因素进行了分析。粉虱子代性比是否偏雌取决于亲代性比、成虫的交配次数和年龄、抗药能力、生物型以及生物型之间的共存竞争。气候因子和食物因子的变化会导致粉虱种群性比发生变化。但是,粉虱体内的内共生菌或所携带的植物病毒对其性比似乎没有太大的影响。

Whiteflies are haplodiploid creatures, and their population sex ratios are usually female-biased and seasonally dynamic. The factors that affect sex ratios of major species of whiteflies in agricultural and forest ecosystems were analyzed. The sex ratios of their progeny depend on the sex ratios of parents, mating frequency and age of adults, resistance to insecticides, biotypes, and competition for coexistence between the biotypes. Changes both in climatic factors and in host plants resulted in fluctuation of the sexratios. Either endosymbionts or plant virus in whiteflies, however, seemed to have little impact to the sex ratios of whiteflies.