Male-biased sexual size dimorphism in a little-known echolocating mouse, Typhlomys daloushanensis

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Yaoxin Qin, Jian Liu, Mingjiang Zou, Tian Tian, Tianbao Luo, Youbing Zhou, Jinwei Wu
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Abstract

Much remains to be established about the socio-ecology and mating system of the soft-furred tree mouse, the Typhlomys species, only genus of rodents confirmed to have evolved echolocation. In this study, we examined sexual size dimorphism (SSD) in T. daloushanensis to gain insight into its as yet unknown mating system. Sexual selection has been generally theorized to drive male-biased SSD among mammals, linked to male competitiveness in polygynous mating systems. We live-trapped 212 adults from Xingshan County in Hubei Province from 2021 to 2023 and supplemented this dataset with 67 individuals measured during a previous study. Our findings revealed a significant male-biased sexual size dimorphism, with males exhibiting notably greater body length (+ 4.3%) and body mass (+ 16.7%) compared to females. This suggests that the larger size may provide an advantage to male T. daloushanensis in competition for access to females (i.e., the Darwin-Bateman-Trivers paradigm), implying the likelihood of a polygynous mating system, although monogamous and promiscuous mating strategies should also be considered in future research. Additionally, ANCOVA analyses revealed that males had significantly longer ears and forefeet than females, beyond allometric scaling. This may indicate a functional basis to specific trait sexual dimorphism linked to differences in agility and auditory perception in this echolocation species. Our first report of male-biased SSD in T. daloushanensis suggests directions for future research to expand understanding of this little-known, echolocating mice, and adds further data on SSD in the Muroidea.

Abstract Image

一种鲜为人知的回声定位鼠--大娄山鼠的雄性偏向性体型二态性
关于软毛树鼠(Typhlomys)的社会生态学和交配系统,还有许多问题有待解决。在这项研究中,我们考察了大娄山鼠的性大小二形性(SSD),以深入了解其尚未知晓的交配系统。性选择被普遍认为是哺乳动物中偏向雄性的SSD的驱动因素,这与多雌交配系统中雄性的竞争性有关。我们从2021年到2023年在湖北省兴山县活体诱捕了212只成体,并用之前研究中测量的67只个体补充了这一数据集。我们的研究结果显示了明显的雄性偏向性体型二态性,雄性的体长(+ 4.3%)和体质量(+ 16.7%)明显大于雌性。这表明体型较大的雄性大娄山蛙可能在与雌性的竞争中具有优势(即达尔文-贝特曼-特里弗斯范式),这意味着可能存在多雄性交配系统,但在未来的研究中也应考虑一夫一妻制和杂交交配策略。此外,方差分析显示,雄性的耳朵和前足明显长于雌性,这超出了等比数列。这可能表明,在这种回声定位物种中,与敏捷性和听觉感知差异相关的特定性状性二态性具有功能性基础。我们首次报告了大娄山蛙雄性偏向的SSD,这为今后的研究指明了方向,以扩大对这种鲜为人知的回声定位小鼠的了解,并为栗鼠科SSD的研究增添了更多数据。
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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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