寄主卵排列对松毛虫赤眼蜂寄生的影响

本文描述了群聚寄主卵和间隔分布的寄主卵对松毛虫赤眼蜂子代分配的影响。单头雌蜂产卵于群聚寄主卵时,平均每粒寄生卵的子蜂数明显少於单粒寄主卵时的子蜂数,但每头雌蜂所产的总子蜂数和被寄生的寄主卵数随着寄主卵群的卵数增加而增加。表明,雌蜂产卵于群聚寄主卵时能减少在每粒寄主卵中所分配的子蜂数,而增加寄生的寄主卵数目。密度制约是限制每头雌蜂寄生寄主卵数目的因素。在分散的寄主卵中,平均每粒寄生卵的子蜂数随着卵粒间距离增加而增加,但每头雌蜂所产的总子蜂数和被寄生的寄主卵数并没有明显地随着寄主卵粒间的距离大小而改变。可见,在分散寄主卵中,雌蜂的生殖力则是限制每头雌蜂寄生寄主数目的一个重要因素。

THE INFLUENCE OF HOST DISTRIBUTION ON PARASITIZATION OF TRICHOGRAMMA DENDROLIMI

This paper described the infIuence of progeny allocation of T.dendrolimi onclustered and separated host eggs.When single female parasitoid parasitizedclustered host eggs,the average progeny per parasitized egg are prominent lessthan that of singular host eggs.But the total progeny produced per female andnumber of host eggs parasitized increased with the size of eggs clustered.Whensingle female parasitoid parasitized separated host eggs,the average progeny perparasitized egg increased with increasing distance between host eggs.The totalprogeny produced per female and number of parasitized host eggs do not changesignificantly as increasing distance between eggs.Experiments showed that theresponse of female to clustered host eggs decreased with the progeny allocationper parasitized egg,and increased with the number of parasitized host eggs.Density dependence is the factor which limit the number of host parasitized perfemale.But in separated host eggs.the reproductive strength of the female is animportant factor limited the number of host parasitized per female.