Assessment of fitness costs of resistance against the parasitoid Leptopilina victoriae in Drosophila bipectinata
Assessment of fitness costs of resistance against the parasitoid Leptopilina victoriae in Drosophila bipectinata
复制标题
果蝇抗寄生类胜利细毛虫的适应性成本评估
DOI：
10.1007/s11284-014-1190-x
复制
发表时间：
2014
影响因子：
2
通讯作者：
M. T.
中科院分区：
文献类型：
--
作者：
Takigahira;T.;Suwito;A.;& Kimura;M. T.
昆虫如何进化出对拮抗物的抗性或反抗性是寄主-拟寄生蜂协同进化研究中的一个基本问题。影响它们共同进化的因素之一是抵抗和反抵抗的适应性成本。在这里，我们评估的健身成本对寄生蜂Leptopilina victoriaeinDrosophila bipectinata的选择实验的基础上。我们通过混合三个抗性不同的地理苍蝇种群来建立一个基础种群。将建立的基础群体分为4个群体，2个用于抗赤眼蜂群体的选择，2个用于对照。抗性随选择的进行而迅速提高，在选择种群中，抗性在4个世代内就达到很高水平，而对照种群在20个世代内抗性仍很低。选择群体的高抗性在停止选择后至少保持了10代。这两个选定的群体有较低的女性寿命比对照群体，至少有一个选定的群体有较短的胸长，较低的女性脱水耐受性和成年耐热性比两个或任何一个控制种群。另一方面，选择种群的雄性饥饿耐受力和寿命高于对照种群。对另一种群的抗性差异不显著。选择种群和对照种群之间的维多利亚和另外两种寄生蜂物种。这些结果表明，对L. victoriaepoluminD. bipectinatama可能会产生一些但不是那么高的成本，并专门作用于寄生蜂-物种-和/或寄生蜂-种群。
How insects evolve resistance or counter‐resistance against antagonists is a basic issue in the study of host‐parasitoid coevolution. One of the factors that affect their coevolution is fitness costs of resistance and counter‐resistance. Here, we assess fitness costs of resistance against the parasitoidLeptopilina victoriaeinDrosophila bipectinataon the basis of selection experiments. We made a base population by mixing three geographic fly populations that differed in resistance. The established base population was divided into four populations, two for selection of resistance against aL. victoriaepopulation and two for control. Resistance increased rapidly in response to selection and reached a very high level within four generations in the selected populations, while resistance of the control populations remained low during 20 generations. High resistance of the selected populations was maintained at least for 10 generations after selection was stopped. Both selected populations had lower female longevity than the control populations, and at least one of the selected populations had shorter thorax length, lower female desiccation tolerance and adult heat tolerance than both or either of the control populations. On the other hand, the selected populations had higher male starvation tolerance and longevity than the control populations. There were no significant differences in resistance against another population ofL. victoriaeand two other parasitoid species between the selected and control populations. These results suggest that the resistance against theL. victoriaepopulation inD. bipectinatamay incur some but not so high costs and act parasitoid‐species‐ and/or parasitoid‐population‐specifically.