The relative fitness of Drosophila melanogaster (Diptera, Drosophilidae) that have successfully defended themselves against the parasitoid Asobara tabida (Hymenoptera, Braconidae)
The relative fitness of Drosophila melanogaster (Diptera, Drosophilidae) that have successfully defended themselves against the parasitoid Asobara tabida (Hymenoptera, Braconidae)
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DOI：
10.1046/j.1420-9101.1999.00018.x
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发表时间：
1999-01-01
影响因子：
2.1
通讯作者：
Godfray, HCJ
中科院分区：
文献类型：
--
作者：
Fellowes, MDE;Kraaijeveld, AR;Godfray, HCJ
果蝇幼虫通过胶囊化的过程来防御寄生蜂的攻击。然而，成功自卫的苍蝇会降低成年后的健康水平。携带被包裹的寄生虫卵的成虫体型较小，雌蜂产卵明显少于对照。被允许与雌性进行多次交配的有胶囊的雄性并没有表现出其后代数量的减少，但那些只被允许交配一次的雄性出现了这种情况。雌虫的首次产卵时间和雄虫的首次交配时间没有差异。我们将这一结果解释为，在促进繁殖力和交配成功的因素上投入资源，以及在抵御寄生虫方面进行权衡。这一投资决策的结果影响到选择抵御寄生虫的力量。
Drosophila melanogaster larvae defend themselves against parasitoid attack via the process of encapsulation. However, flies that successfully defend them selves have reduced fitness as adults. Adults which carry an encapsulated parasitoid egg are smaller and females produce significantly fewer eggs than controls. Capsule-bearing males allowed repeated copulations with females do not show a reduction in their number of offspring, but those allowed to copulate only once did. No differences were found in time to first oviposition in females, or in time to first copulation in males. We interpret the results as arising from a trade-off between investing resources in factors promoting fecundity and mating success, and in defence against parasitism. The outcome of this investment decision influences the strength of selection for defence against parasitism.