寄生七星瓢虫的两种啮小蜂种间竞争初探
毕业论文关键词：瓢虫啮小蜂；七星瓢虫；产卵行为；性比；多寄生
Interspecific competition between two parasitoids (Hymenoptera: Eulophidae) of Coccinella sempempunctata (Coleoptera: Coccinellidae)
Abstract: This study examined differences in oviposition behaviors of two parasitoid species Oomyzus scaposus and O. sp. (thereafter referred to as “black tibia wasp” and “yellow tibia wasp”) attacking the ladybird beetle Coccinella sempempunctata. A ladybird larva was exposed to parasitism (a bout of either sting or parasitization) by one parasitoid species and then by the other. Single parasitism was used as the control. The number and sex ratio of offspring parasitoids by species were compared. (1) Under the control, the number of offspring differed between a bout of ovipositor stinging and of parasitization. For the yellow tibia wasp, the number of offspring parasitoids (5.130 ± 0.767）from a bout of stinging as smaller than that (9.000 ± 0.956) from a bout of parasitization. For the black tibia wasp, there was not a difference in the number of offspring between two types of attack Sex ratio was not different between two types of attack for each parasitoid species. (2) Under the treatment, the number and sex ratio of offspring by a later wasp did not depend on parasitoids that made the first attack, but on how it was attacked. If the host was attacked by a bout of stinging by the black tibia wasp, it was attacked in a low likelihood (25%) by the yellow tibia wasp, as opposed to more than 70% under the other treatments (4) When a host was attacked in succession by the two wasps, the later wasp had more share of offspring than the former did, irrespective of whichever made the first attack. (5) When a host was attacked by a bout of stinging by either of two wasps, the offspring was equally shared in number by two wasps. The results suggest that Oomyzus scaposus and O. sp. may differ in oviposition behavior in response to a host previously parasitized by each other.
Keywords：; Coccinella semtempunctata; oviposition behavior; sex ratio; multiple parasitism
目 录
摘要….…1
关键词1
Abstract.…1
Key words…..…1
引言…1
1 材料与方法….… 2
1.1 供试昆虫来源 ….2
1.2 实验方法 ….2
1.3 数据处理..…. 2
2 结果与分析3
2.1 不同寄生方式对首蜂后代数量和性比的影响 3
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