Dispersal–reproduction trade-off in the leaf beetle Galerucella grisescens,Entomologia Experimentalis et Applicata

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Dispersal–reproduction trade-off in the leaf beetle Galerucella grisescens
Entomologia Experimentalis et Applicata ( IF 1.4 ) Pub Date : 2021-03-01 , DOI: 10.1111/eea.13042
Shota Nasu ₁ , Makoto Tokuda ₁

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Dispersion–reproduction trade-offs are important to explore the evolutionary mechanism of dispersal strategies and the adaptive significance of dispersion in insects. In our previous study, variations in hindwing length were found in Japanese populations of the leaf beetle Galerucella grisescens (Joannis) (Coleoptera: Chrysomelidae). They were distinctly divided into either long-winged (LW) or short-winged (SW) morphs in the field. The LW morphs were distributed widely in Japan, whereas the SW morphs were found in restricted areas in Honshu, the main island of Japan. We examined the possible existence of trade-offs between dispersion and reproduction in G. grisescens by laboratory experiments. Larval duration and adult body size (head width) were not significantly different between LW and SW strains, but adult body weight was larger in some LW strains than in SW strains, most likely due to the size of hindwings and legs as well as to the development of flight muscles. Although the pre-oviposition period was not significantly different among strains, female longevity and fertility were significantly higher in SW than in LW strains. Long-winged individuals displayed flutter behaviours, suggesting their flight dispersal abilities, but SW individuals did not. Femurs of LW individuals were significantly longer on all legs compared to SW strains and the former walked faster than the latter. The present results indicate the presence of a dispersion–reproduction trade-off in G. grisescens, in which SW strains have advantages in reproductive abilities and LW strains in dispersal abilities.

中文翻译：

叶甲虫Galerucella grisescens中的分散繁殖权衡

分散与繁殖之间的权衡对于探索分散策略的进化机制以及昆虫中分散的适应性意义非常重要。在我们先前的研究中，发现日本甲虫（Garanucella grisescens）（Joannis）（鞘翅目：菊科）的后代长度存在差异。它们在野外明显分为长翼（LW）或短翼（SW）变体。LW形态在日本分布广泛，而SW形态则在日本主岛本州的禁区发现。我们研究了G中分散和再生产之间可能存在的取舍关系。grisescens通过实验室实验。LW和SW株之间的幼虫持续时间和成年体重（头宽）没有显着差异，但是某些LW株的成虫体重比SW株大，这很可能是由于后腿和腿的大小以及飞行肌肉的发育。尽管各产程的产卵前期没有显着差异，但西南部的雌性长寿和生育率明显高于长线型。长翼个人表现出扑朔迷离的行为，表明他们的飞行分散能力，而西南个人没有。与SW株相比，LW个体的股骨在所有腿上的长度明显更长，并且前者的行走速度快于后者。目前的结果表明，在G. grisescens中存在分散-繁殖之间的折衷，其中SW菌株在繁殖能力方面具有优势，而LW菌株在繁殖能力方面具有优势。

更新日期：2021-03-01

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