椰甲截脉姬小蜂野外种群与实验种群差异性比较

Comparisons of the field and laboratory populations of Asecodes hispinarum Bouek

通过随机抽样,比较了椰甲截脉姬小蜂Asecodes hispinarum Boucˇek林间种群与室内种群的雌雄比、出蜂量、未出蜂量、怀卵量的差异。t检验表明这些参数在2个种群间均存在显著的差异。野外种群和室内种群雌蜂比例分别占81.63%±2.54%和65.34%±1.80%,出蜂量分别是(25.13±1.17)头和(52.90±1.88)头。利用相关分析分析了寄主大小对寄生蜂性比的影响,表明寄主大小和寄生蜂雌雄比没有相关关系,不符合Charnov建立的寄生雌雄比与寄主大小关系的数学模型。

Field and laboratory populations of the parasitoid Asecodes hispinarum Bouek were randomly sampled,and sex ratios,the number of emerged and unemerged adults and egg numbers compared between the two populations.t-test indicated that these parameters differed significantly between the two populations.The proportion of females in the field population was 81.63%±2.54% compared to 65.34%±1.80% in the laboratory population and the number of emerged adults in the field population was 25.13±1.17 compared to 52.90±1.88 in the laboratory.The effect of host size on sex ratio was analyzed by correlation analysis;no relationship between host size and sex ratio was observed.This result is contrary to the prediction derived from Charnov’s model.