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<p>Predation pressure is natural selection acting on the prey. To ascertain whether prey evolve strategies to avoid predator attacks, experimental evolution was conducted using the red flour beetle, <i>Tribolium castaneum</i> herbst (Coleoptera: Tenebrionidae), and the adults of assassin bug, <i>Amphibolus venator</i> klug (Hemiptera: Reduviidae), as the model prey and predator, respectively. In this study, we compared two predator avoidance behaviors in strains of <i>T. castatneum</i> that were housed with (= Treatment) and without (= Control) predators for five generations. The results of the experimental evolutions showed no differences in activity levels. While significant difference in death-feigning duration between the two strains was observed; that is, the strains cohabiting with the predator showed significantly longer duration of death feigning at the five than the first generation in the strains not cohabiting with the predator. Therefore, our results suggest for the first time that death-feigning duration changes longer when exposed to predation pressure over successive generations under predation pressure. The reasons for the changes in traits across generations observed in this study are discussed.</p>

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Experimental evolution of prey by predation pressure: death-feigning duration becomes longer in the presence of predators

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月7日

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  • Yuuki Miura,
  • Hayato Takii,
  • Kentarou Matsumura,
  • Takahisa Miyatake

摘要

Predation pressure is natural selection acting on the prey. To ascertain whether prey evolve strategies to avoid predator attacks, experimental evolution was conducted using the red flour beetle, Tribolium castaneum herbst (Coleoptera: Tenebrionidae), and the adults of assassin bug, Amphibolus venator klug (Hemiptera: Reduviidae), as the model prey and predator, respectively. In this study, we compared two predator avoidance behaviors in strains of T. castatneum that were housed with (= Treatment) and without (= Control) predators for five generations. The results of the experimental evolutions showed no differences in activity levels. While significant difference in death-feigning duration between the two strains was observed; that is, the strains cohabiting with the predator showed significantly longer duration of death feigning at the five than the first generation in the strains not cohabiting with the predator. Therefore, our results suggest for the first time that death-feigning duration changes longer when exposed to predation pressure over successive generations under predation pressure. The reasons for the changes in traits across generations observed in this study are discussed.