Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.
Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), CONICET, Universidad de Buenos Aires, Buenos Aires, Argentina.
J Evol Biol. 2018 Jul;31(7):957-967. doi: 10.1111/jeb.13277. Epub 2018 May 2.
Closely related species often differ in the signals involved in sexual communication and mate recognition. Determining the factors influencing signal quality (i.e. signal's content and conspicuousness) provides an important insight into the potential pathways by which these interspecific differences evolve. Host specificity could bias the direction of the evolution of sexual communication and the mate recognition system, favouring sensory channels that work best in the different host conditions. In this study, we focus on the cactophilic sibling species Drosophila buzzatii and D. koepferae that have diverged not only in the sensory channel used for sexual communication and mate recognition but also in the cactus species that use as primary hosts. We evaluate the role of the developmental environment in generating courtship song variation using an isofemale line design. Our results show that host environment during development induces changes in the courtship song of D. koepferae males, but not in D. buzzatii males. Moreover, we report for the first time that host rearing environment affects the conspicuousness of courtship song (i.e. song volume). Our results are mainly discussed in the context of the sensory drive hypothesis.
密切相关的物种在性通讯和配偶识别中涉及的信号往往存在差异。确定影响信号质量的因素（即信号的内容和显著性）可以深入了解这些种间差异进化的潜在途径。宿主特异性可能会影响性通讯和配偶识别系统的进化方向，有利于在不同宿主条件下效果最佳的感觉通道。在这项研究中，我们专注于亲缘关系密切的仙人掌物种果蝇 buzzatii 和 D. koepferae，它们不仅在用于性通讯和配偶识别的感觉通道上发生了分歧，而且在作为主要宿主的仙人掌物种上也发生了分歧。我们使用同系雌性系设计来评估发育环境在产生求偶歌曲变异中的作用。我们的结果表明，发育过程中的宿主环境会诱导 D. koepferae 雄蝇求偶歌曲发生变化，但不会诱导 D. buzzatii 雄蝇发生变化。此外，我们首次报告宿主饲养环境会影响求偶歌曲的显著性（即音量）。我们的结果主要在感觉驱动假说的背景下进行讨论。
