REPRODUCTIVE CHARACTER DISPLACEMENT OF EPICUTICULAR COMPOUNDS AND THEIR CONTRIBUTION TO MATE CHOICE IN DROSOPHILA SUBQUINARIA AND DROSOPHILA RECENS
REPRODUCTIVE CHARACTER DISPLACEMENT OF EPICUTICULAR COMPOUNDS AND THEIR CONTRIBUTION TO MATE CHOICE IN DROSOPHILA SUBQUINARIA AND DROSOPHILA RECENS
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DOI：
10.1111/evo.12335
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发表时间：
2014-04-01
期刊：
影响因子：
3.3
通讯作者：
Rundle, Howard D.
中科院分区：
文献类型：
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作者：
Dyer, Kelly A.;White, Brooke E.;Rundle, Howard D.
物种之间的相互作用可以改变物种内用于配偶选择的有性展示上的选择。在这里，我们研究了两种果蝇的表皮层信息素，这两种果蝇在地理范围内部分重叠，并且不完全繁殖隔离。小奎氏果蝇表现出对近缘果蝇的生殖特征移位，同种同域种群与异地种群之间的部分行为隔离，而近缘果蝇在交配选择上没有这种变化。首先，通过操纵香气实验，我们证明了雌性利用信息素作为物种之间和种群之间的配偶辨别的信号。其次，我们证明了表皮层化合物的变异模式，无论是在种群之间还是在物种之间，都与以前显示的交配概率一致：与D.recens异地与共面的D.subquaria种群之间信息素组成不同，但无论与D.subquaria重叠，D.recens种群之间的信息素组成是相似的。此外，我们还鉴定了不同异地分布的小昆虫病原昆虫信息素组成的差异。综上所述，我们的结果表明，表皮层化合物是雌性在配偶识别过程中使用的关键信号，这些特征在小奎师种群之间存在差异，以响应由D.recens的存在而产生的加强选择。
Interactions between species can alter selection on sexual displays used in mate choice within species. Here we study the epicuticular pheromones of two Drosophila species that overlap partially in geographic range and are incompletely reproductively isolated. Drosophila subquinaria shows a pattern of reproductive character displacement against Drosophila recens, and partial behavioral isolation between conspecific sympatric versus allopatric populations, whereas D. recens shows no such variation in mate choice. First, using manipulative perfuming experiments, we show that females use pheromones as signals for mate discrimination both between species and among populations of D. subquinaria. Second, we show that patterns of variation in epicuticular compounds, both across populations and between species, are consistent with those previously shown for mating probabilities: pheromone compositions differ between populations of D. subquinaria that are allopatric versus sympatric with D. recens, but are similar across populations of D. recens regardless of overlap with D. subquinaria. We also identify differences in pheromone composition among allopatric regions of D. subquinaria. In sum, our results suggest that epicuticular compounds are key signals used by females during mate recognition, and that these traits have diverged among D. subquinaria populations in response to reinforcing selection generated by the presence of D. recens.