Insecticide resistance enhances male reproductive success in a beetle
Insecticide resistance enhances male reproductive success in a beetle
复制标题
DOI：
10.1111/j.0014-3820.2002.tb00169.x
复制
发表时间：
2002-12-01
期刊：
影响因子：
3.3
通讯作者：
Haubruge, E
中科院分区：
文献类型：
--
作者：
Arnaud, L;Haubruge, E
赤拟谷盗对马拉硫磷的特异性抗性在自然种群中广泛而稳定，即使在没有农药暴露的情况下也是如此。为了理解这种稳定性，抗性和易感雄性都被置于易感雌性受精的竞争中。然后将雌性分离，并测试其后代对马拉硫磷的敏感性。男性生殖成功估计来自不同地理区域的人口和同基因株。在大多数情况下，耐药雄性的繁殖成功率高于易感雄性。结果表明，男性生殖成功是不交易对马拉硫磷抗性的选择，即使是抗性个体在这个健身性状的优势。这种适应性成本的缺失可能是由于（1）改善抗性个体适应性的修饰基因或（2）无害抗性基因的后选择。抗性表型优势可能是由于雄性交配成功率增加、抗性雄性在精子竞争中的能力提高、雌性配偶选择和/或隐性雌性抗性基因选择。雄性表型频率对雄性繁殖成功的影响也进行了研究。我们观察到，男性受精的成功是频率依赖性的，并与他们的频率呈负相关。然而，这种“稀有雄性”的优势并没有抵消抗性雄性的优势。
Malathion-specific resistance in the red flour beetle, Tribolium castaneum, is widespread and stable in natural populations even in the absence of pesticide exposure. To understand this stability, both resistant and susceptible males were placed in competition for susceptible female fertilization. Females were then isolated and their progeny was tested for malathion susceptibility. Male reproductive success was estimated for populations originating from different geographic areas and for isogenic strains. In most cases, resistant males had a greater reproductive success rate than susceptibles. The results suggest that male reproductive success is not traded against the selection for malathion resistance, even resistant individuals are at an advantage for this fitness trait. This absence of fitness cost may be the result of postselection of (1) modifier gene which ameliorate the fitness of resistant individuals or (2) nondeleterious resistance gene. Resistant phenotype superiority could be due to increased male mating success, improved ability of resistant males in sperm competition, female mate choice, and/or cryptic female choice of resistance gene(s). The effect of male phenotypic frequency on male reproductive success was also examined. We observed that male fertilization success is frequency dependent and inversely related to their frequency. However, this "rare male" advantage did not counteract the superiority of the resistant males.