How does the timing of weapon loss influence reproductive traits and trade-offs in the insect Narnia femorata ?
How does the timing of weapon loss influence reproductive traits and trade-offs in the insect Narnia femorata ?
复制标题
武器丢失的时间如何影响纳尼亚昆虫的繁殖特征和权衡？
DOI：
10.1093/evolut/qpad046
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发表时间：
2023
期刊：
影响因子：
3.3
通讯作者：
Miller, Christine W.
中科院分区：
文献类型：
--
作者：
Greenway, E. V;Angelis, Emily;Miller, Christine W.
进化生物学的一个长期目标是了解资源分配决策的个体间差异以及这些决策的时机。最近的研究表明，对精致而昂贵的武器的投资可能会导致与对睾丸的投资的权衡。在这项研究中，我们问了以下问题：在发育过程中，这些不同结构的资源分配的可塑性在什么时候停止，如果完全停止的话？此外，个体是否可以调整自己的生殖行为以适应结构的变化？我们通过实验解决了这些问题，使用表型工程学方法，首次量化了不同发育阶段的资源重新分配。为了研究个体发育过程中分配可塑性是否降低，我们在一系列不同的发育阶段诱导了武器丢失，并检查了随后的睾丸质量和生殖行为。我们发现，相对睾丸质量随着武器投资的减少而增加，这意味着睾丸和武器投资之间存在直接的权衡。然而，成年后的自体切除不再导致更大的睾丸肿块。有趣的是，年轻时失去武器与成年交配持续时间延长有关，这可能会补偿战斗能力的下降。我们的结果强调了研究生殖特征之间的个体发育权衡以及生殖形态和行为之间关系的灵活性的重要性。
A longstanding goal of evolutionary biology is to understand among-individual variation in resource allocation decisions and the timing of these decisions. Recent studies have shown that investment in elaborate and costly weapons can result in trade-offs with investment in testes. In this study, we ask the following questions: At what point plasticity in resource allocation to these different structures ceases during development, if at all? Furthermore, can individuals tailor their reproductive behavior to accompany structural changes? We experimentally addressed these questions in the insectNarnia femorata, quantifying resource reallocation across development for the first time, using a phenotypic engineering approach. To investigate whether allocation plasticity diminishes throughout ontogeny, we induced weapon loss at a range of different developmental stages and examined subsequent testes mass and reproductive behavior. We found that relative testes mass increased as weapon investment decreased, implying a direct trade-off between testes and weapon investment. However, autotomy postadulthood ceased to induce larger testes mass. Intriguingly, losing a weapon while young was associated with extended adult mating duration, potentially enabling compensation for reduced fighting ability. Our results highlight the importance of examining the ontogeny of trade-offs between reproductive traits and the flexibility of the relationship between reproductive morphology and behavior.