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为检验基于经典搜寻理论的最优膳食模型的预测——产卵雌蜂应该选择最适于子代蜂发育的寄主种进行产卵,本研究以斑痣悬茧蜂(Meteorus pulchricornis)及其寄主斜纹夜蛾(Spodoptera litura)和粘虫(Mythimna separata)的幼虫为材料,在控制寄主体型大小和龄期影响的基础上,分别在体型大小相近和日龄相同的3个水平上观察了斑痣悬茧蜂对2种寄主幼虫的选择偏好,并观察了子代蜂生长发育适应度表现。在观察期(1h)内,当2种寄主幼虫的体型相近或者龄期相同的情况下,斑痣悬茧蜂对粘虫的产卵器刺扎次数以及寄生率(用结茧率表示)均高于斜纹夜蛾;而在斜纹夜蛾幼虫体内发育出的子代蜂茧重和体型均大于粘虫,成蜂寿命无显著差异。最后,对斑痣悬茧蜂的寄主选择和子代发育表现不一致现象进行了讨论。
In order to test the optimal dietary model based on classical search theory, oviposition females should choose the most suitable species for the development of offspring to lay their eggs. In this study, Meteorus pulchricornis and its host Spodoptera litura and Mythimna separata larvae were used as materials. On the basis of controlling the size and age of the host body, spotted nevi were observed on the same body size and age at the same three levels The selection preference of two species of host larvae by Brachionus pochaei and the observation of the fitness of growth and development of offspring bee. During the observation period (1h), when the two host larvae were similar in body size or the same in age, both the number of spawning stings and the parasitism rate (expressed as cocoon rate) of the armyworm Higher than that of Spodoptera litura. However, the callus weight and body size of the offspring developed in the Spodoptera litura larvae were greater than that of the armyworm, and there was no significant difference in adult longevity. Finally, we discuss the host selection and the developmental inconsistency of the offspring of Monochamus alternatus.