Evolution of ageing, costs of reproduction and the fecundity-longevity trade-off in eusocial insects.
Evolution of ageing, costs of reproduction and the fecundity-longevity trade-off in eusocial insects.
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DOI：
10.1098/rspb.2017.0380
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发表时间：
2017-07-12
期刊：
影响因子：
--
通讯作者：
Bourke AFG
中科院分区：
文献类型：
--
作者：
Blacher P;Huggins TJ;Bourke AFG
真社会性昆虫提供了特殊的机会来阐明老化的进化，因为女王显然避免了繁殖成本，并扭转了在非社会性生物中普遍观察到的生育力-寿命权衡。但是生殖如何影响真社会性昆虫的寿命却很少被实验验证。在这项研究中，我们利用工人的生殖可塑性，以测试的因果关系的作用，生殖在决定真社会性昆虫的寿命。使用真社会熊蜂terrestris，我们发现，在整个殖民地，工人可以自由地选择是否成为生殖，工人的卵巢激活水平显着正相关的长寿和卵巢活跃的工人显着超过卵巢不活跃的工人。相比之下，当生殖实验诱导随机选择的工人，从而脱钩从其他性状，工人的卵巢激活水平显着负相关的寿命和卵巢活跃的工人显着不长的寿命比卵巢不活跃的工人。这些研究结果表明，工人的经验成本的繁殖，并建议，本质上高素质的个人可以克服这些成本。他们还提出了一种可能性，即真社会性昆虫女王表现出条件依赖性寿命，因此提出了一个问题，即真社会性是否需要一个真正逆转的生殖力寿命权衡，涉及一个基本的改造保守的遗传和内分泌网络的基础老化。
Eusocial insects provide special opportunities to elucidate the evolution of ageing as queens have apparently evaded costs of reproduction and reversed the fecundity–longevity trade-off generally observed in non-social organisms. But how reproduction affects longevity in eusocial insects has rarely been tested experimentally. In this study, we took advantage of the reproductive plasticity of workers to test the causal role of reproduction in determining longevity in eusocial insects. Using the eusocial bumblebee Bombus terrestris, we found that, in whole colonies, in which workers could freely ‘choose’ whether to become reproductive, workers' level of ovarian activation was significantly positively associated with longevity and ovary-active workers significantly outlived ovary-inactive workers. By contrast, when reproductivity was experimentally induced in randomly selected workers, thereby decoupling it from other traits, workers' level of ovarian activation was significantly negatively associated with longevity and ovary-active workers were significantly less long-lived than ovary-inactive workers. These findings show that workers experience costs of reproduction and suggest that intrinsically high-quality individuals can overcome these costs. They also raise the possibility that eusocial insect queens exhibit condition-dependent longevity and hence call into question whether eusociality entails a truly reversed fecundity–longevity trade-off involving a fundamental remodelling of conserved genetic and endocrine networks underpinning ageing.
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