Male–female chemical interactions in a facultatively parthenogenetic stick insect

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Wai Chi Vicky Ying, Daniela Wilner, Lewis Adler, Zachariah Wylde, Russell Bonduriansky
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Abstract

Facultative parthenogenesis is a form of reproduction in which females can either lay unfertilised eggs that typically develop into female offspring only or mate and lay fertilised eggs that develop into male and female offspring. Intriguingly, facultative parthenogens often occur in mixed-sex populations where reproduction is mostly sexual and all-female populations where reproduction is asexual. How all-female populations avoid invasion by males remains unknown. Here, we explored the use of pheromones in male–female communication in a facultatively parthenogenetic stick insect, the peppermint stick insect (Megacrania batesii), and compared chemical signals between females descended from sexually versus parthenogenetically reproducing populations. If parthenogenetic females release less attractive pheromones, this could help explain the persistence of all-female populations. We found that M. batesii exhibits slight sexual dimorphism in antenna morphology, and behavioural assays provided little evidence that males could locate females solely by volatile pheromones. However, CHC profiles differed substantially between different types of females. Analysis of CHC components indicated a clear genetic difference between females descended from all-female versus mixed-sex populations, as well as a maternal effect of female parthenogenetic versus sexual development. Together, our results suggest that males might rely more on close-range chemical cues to differentiate females, and chemical communication could play a role in the persistence of all-female populations.

Abstract Image

一种兼性孤雌生殖粘虫的雌雄化学相互作用
兼性孤雌生殖是一种生殖方式,雌性可以产下未受精卵,通常只发育成雌性后代;也可以交配并产下受精卵,发育成雌雄后代。耐人寻味的是,兼性孤雌生殖动物经常出现在混性种群和全雌性种群中,混性种群的生殖方式主要是有性生殖,而全雌性种群的生殖方式则是无性生殖。全雌性种群如何避免雄性入侵仍是未知数。在这里,我们探索了一种表面孤雌生殖的粘虫--薄荷粘虫(Megacrania batesii)在雌雄交流中使用信息素的情况,并比较了有性生殖和孤雌生殖种群雌性后代之间的化学信号。如果孤雌生殖的雌性释放的信息素吸引力较低,这可能有助于解释全雌性种群的持续存在。我们发现 M. batesii 在触角形态上表现出轻微的性二态性,行为测定也几乎没有证据表明雄性可以仅靠挥发性信息素来确定雌性的位置。然而,不同类型的雌性之间的 CHC 图谱差异很大。对CHC成分的分析表明,全雌性与混性种群的雌性之间存在明显的遗传差异,雌性孤雌生殖与有性发育之间也存在母性效应。总之,我们的研究结果表明,雄性可能更依赖于近距离的化学线索来区分雌性,化学交流可能在全雌性种群的持续存在中发挥作用。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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