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首页> 美国卫生研究院文献>Proceedings of the Royal Society B: Biological Sciences >Division of labour influences the rate of ageing in weaver ant workers.
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Division of labour influences the rate of ageing in weaver ant workers.

机译：分工会影响织布工工人的老化率。

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摘要

The evolutionary theory of ageing predicts that the timing of senescence has been primarily shaped by the extrinsic mortality rate, which causes selection intensity to decline over time. One difficulty in testing the evolutionary theory of ageing is that extrinsic mortality risk is often confounded with body size and fecundity, which may also directly affect lifespan. Social insects with a pronounced division of labour between worker castes provide a unique opportunity to study the direct effect of extrinsic mortality on the evolution of ageing rates independently of body size, reproductive effort and genetic configuration. In the weaver ant, Oecophylla smaragdina, the major (large) workers perform the risky tasks outside the nest, while the minor (small) workers stay within the highly protected arboreal nest. Hence, this pronounced division of labour is associated with high differences in extrinsic mortality risks. The evolutionary theory of ageing predicts that the minor workers should have a longer intrinsic lifespan than the major workers. In line with this prediction, we found that in a protected environment the minor workers lived significantly longer than the major workers did. Hence, the ageing rate appears to have been moulded by variation in the extrinsic mortality rate independently of size, reproductive effort and genetic configuration.
机译：衰老的进化理论预测衰老的时机主要由外部死亡率决定，这导致选择强度随时间下降。测试衰老进化论的一个困难是，外部死亡风险通常与体型和生殖力混杂在一起，这也可能直接影响寿命。社会工人在种姓之间具有明显的分工，这为研究外在死亡率对衰老率演变的直接影响提供了独特的机会，而后者与体重，生殖力和遗传结构无关。在织叶蚁（Oecophylla smaragdina）中，主要（大）工人在巢外执行危险任务，而次要（小）工人则留在高度保护的树木巢内。因此，这种明显的分工与外部死亡风险的巨大差异相关。衰老的进化理论预测，未成年工人的固有寿命应比主要工人更长。根据这一预测，我们发现，在受保护的环境中，未成年工人的寿命明显长于主要工人。因此，衰老率似乎是由外在死亡率的变化所决定的，而这种变化与大小，生殖力和遗传结构无关。

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