Greater degree of body size plasticity in males than females of the rhinoceros beetle Trypoxylus dichotomus

Greater degree of body size plasticity in males than females of the rhinoceros beetle Trypoxylus dichotomus
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犀牛甲虫 Trypoxylus dichotomus 的雄性体型可塑性高于雌性

DOI:
10.1007/s13355-019-00618-0
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发表时间:
2019
影响因子:
1.3
通讯作者:
W
W
中科院分区:
农林科学3区
文献类型:
--
作者:
Kojima;W

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在许多具有雌性偏向性大小二态性(SSD)的昆虫物种中,雌性身体大小比雄性身体大小对发育期间的环境条件更敏感(即,女性比男性大)。然而,性别差异的身体大小可塑性在很大程度上是未知的物种与男性偏见的SSD。在这里,我进行了一项实验室实验,使用低质量和高质量的饮食,以检查性别差异的身体大小可塑性在男性较大的犀牛beetleTrypoxylus dichotomusLinnaeus,1771(鞘翅目:金龟子科)。我发现男性的身体尺寸比女性的身体尺寸更受营养状况的影响。男性身体大小的更强的条件依赖性可能与男性身体大小的性选择有关。此外,在野外捕获的甲虫,男性表现出较大的身体大小的差异,在人口之间的年,而女性的身体大小是比较恒定的。在种群和年份内,男性的身体大小也表现出比女性的身体大小更大的变化。此外,现场捕获的甲虫的SSD通常比相应种群的实验室饲养的甲虫小得多。因此,在这个物种中,男性的身体大小的更强的条件依赖性可能有深远的影响,观察到的身体大小和SSD之间和种群内的变化。
Female body size is more sensitive to the environmental conditions during development than male body size in many insect species with female-biased sexual size dimorphism (SSD) (i.e., females are larger than males). However, the sexual difference in body size plasticity is largely unknown in species with male-biased SSD. Here, I conducted a laboratory experiment using low- and high-quality diets to examine sexual differences in body size plasticity in the male-larger rhinoceros beetleTrypoxylus dichotomusLinnaeus, 1771 (Coleoptera: Scarabaeidae). I found that male body size was much more greatly affected by nutritional status than female body size. The stronger condition dependency in male body size is likely associated with sexual selection for male body size. Furthermore, in wild-caught beetles, males showed larger body size differences between years within populations, while the body size of females was more constant. Within populations and years, male body size also showed greater variation than female body size. In addition, SSD of field-caught beetles was usually much smaller than that of lab-reared beetles of corresponding populations. Thus, the stronger condition dependency of male body size in this species probably has profound effects on the variation of observed body size and SSD among and within populations.
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