Inbreeding alters context‐dependent reproductive effort and immunity in male crickets

Infection can cause hosts to drastically alter their investment in key life‐history traits of reproduction and defence. Infected individuals are expected to increase investment in defence (e.g., by increasing immune function) and, due to trade‐offs, investment in other traits (e.g., current reproduction) should decrease. However, the terminal investment hypothesis postulates that decreased lifespan due to infection and the associated reduction in the expectation for future offspring will favour increased investment towards current reproduction. Variation in intrinsic condition will likely influence shifts in reproductive investment post‐infection, but this is often not considered in such assessments. For example, the extent of inbreeding can significantly impact an individual's lifetime fitness and may influence its reproductive behaviour following a threat of infection. Here, we investigated the effects of inbreeding status on an individual's reproductive investment upon infection, inc...感染可促使宿主大幅调整其在繁殖与防御两类关键生活史性状（life-history traits）上的资源投入。受感染个体通常会增加对防御相关性状的投入（例如增强免疫功能）；而由于资源权衡（trade-offs），其在其他性状（例如当前繁殖）上的投入则会相应减少。然而，终端投资假说（terminal investment hypothesis）提出：感染导致的寿命缩短，以及由此带来的未来繁殖机会预期下降，会促使个体增加对当前繁殖的资源投入。个体的内在状态（intrinsic condition）差异可能会影响感染后的繁殖投入变化，但这类评估往往未考虑该因素。例如，近交（inbreeding）程度可显著影响个体的终生适合度（lifetime fitness），并可能在感染威胁下改变其繁殖行为。本研究旨在探究近交状态对个体感染后繁殖投入的影响，inc...